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A numerical investigation of frost growth on cold surfaces based on the lattice boltzmann method EI Scopus CSSCI-E
期刊论文 | 2018 , 11 (8) | Energies
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Abstract :

A numerical investigation of frost growth on a cold flat surface was presented based on two-dimensional Lattice Boltzmann model. This model has been validated to have less prediction error by past experiments. According to the results, it is shown that average frost density appears different at an increasing rate at different frosting stages. In addition, cold surface temperature has great influence on frost growth parameters such as frost crystal deposition mass, frost deposition rate, and frost crystal volume fraction. It was found that the frost crystal deposition mass, frost crystal volume, and the deposition rate first increase rapidly, then gradually slow down, finally remaining unchanged while the cold surface temperature decreases. The further away from the cold surface, the more sparser the frost layer structure becomes due to the smaller frost crystal volume fraction. © 2018 MDPI AG. All Rights Reserved.

Keyword :

Cold surface Crystal deposition Frost growth Lattice boltzmann Lattice Boltzmann method Numerical investigations Prediction errors Two-dimensional lattices

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GB/T 7714 Gong, Jianying , Hou, Jianqiang , Sun, Jinjuan et al. A numerical investigation of frost growth on cold surfaces based on the lattice boltzmann method [J]. | Energies , 2018 , 11 (8) .
MLA Gong, Jianying et al. "A numerical investigation of frost growth on cold surfaces based on the lattice boltzmann method" . | Energies 11 . 8 (2018) .
APA Gong, Jianying , Hou, Jianqiang , Sun, Jinjuan , Li, Guojun , Gao, Tieyu . A numerical investigation of frost growth on cold surfaces based on the lattice boltzmann method . | Energies , 2018 , 11 (8) .
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A lattice Boltzmann study of frost growth on a cold surface EI Scopus
期刊论文 | 2018 , 98 , 116-124 | International Communications in Heat and Mass Transfer
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Abstract :

A two-dimensional Lattice Boltzmann model was established to study the dynamic physical process of frost growth on a cold flat surface. It is verified that the theoretical results are in good agreement with the experiment data with better accuracy. The frost morphology is explored by showing two-dimension density distribution with different cold surface temperatures. The results also include dynamic characteristics of frost properties such as thickness, deposition weight, volume fraction, density, temperature. According to the results, it is found that the nearer it is from the cold flat plate, the larger of frost crystal volume fraction and density are. The frost surface temperature increases rapidly at the early period of frosting and then increases gradually towards the triple point temperature of the water. The frost internal temperatures rise in a linear tendency with the frost thickness and decrease at the same frost layer location with frost growth. Super-saturation degree of moist air has non-negligible effect on frost growth parameters such as frost thickness, frost crystal deposition mass, frost deposition rate and frost crystal volume fraction. © 2018

Keyword :

Cold surface Density distributions Dynamic characteristics Frost growth Internal temperature Lattice boltzmann Triple point temperatures Two-dimensional lattices

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GB/T 7714 Gong, Jianying , Hou, Jianqiang , Li, Guojun et al. A lattice Boltzmann study of frost growth on a cold surface [J]. | International Communications in Heat and Mass Transfer , 2018 , 98 : 116-124 .
MLA Gong, Jianying et al. "A lattice Boltzmann study of frost growth on a cold surface" . | International Communications in Heat and Mass Transfer 98 (2018) : 116-124 .
APA Gong, Jianying , Hou, Jianqiang , Li, Guojun , Gao, Tieyu , Sun, Jinjuan . A lattice Boltzmann study of frost growth on a cold surface . | International Communications in Heat and Mass Transfer , 2018 , 98 , 116-124 .
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Contrastive experimental study on heat transfer and friction characteristics in steam cooled and air cooled rectangular channels with rib turbulators EI SCIE Scopus
期刊论文 | 2014 , 28 (9) , 3845-3854 | JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY | IF: 0.838
WoS CC Cited Count: 6
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Abstract :

The present experiment compares the heat transfer and friction characteristics in steam cooled and air cooled rectangular channels (simulating a gas turbine blade cooling passage) with two opposite rib-roughened walls. The Reynolds number (Re) whose length scale is the hydraulic diameter of the passage is set within the range of 10000-60000. The channel length is 1000 mm. The pitch-to-rib height ratio, the channel aspect ratio and the channel blockage ratio is 10, 0.5 and 0.047, respectively. It is found that the average Nu, the average friction coefficient, and the heat transfer performance of both steam and air in the ribbed channels show almost the same change trend with the increase of Re. Under the same test conditions, the average Nu of steam is 30.2% higher than that of air, the average friction coefficient is 18.4% higher, and the heat transfer performances of steam on the ribbed and the smooth walls are 8.4% and 7.3% higher than those of air, respectively. In addition, semi-empirical correlations for the two test channels are developed, which can predict the Nu under the given test condition. The correlations can be used in the design of the internal cooling passage of new generation steamcooled gas turbine blade/vane.

Keyword :

Heat transfer characteristics Gas turbine Steam-cooled Rectangular channel Friction characteristics

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GB/T 7714 Gong, Jianying , Gao, Tieyu , Li, Guojun . Contrastive experimental study on heat transfer and friction characteristics in steam cooled and air cooled rectangular channels with rib turbulators [J]. | JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY , 2014 , 28 (9) : 3845-3854 .
MLA Gong, Jianying et al. "Contrastive experimental study on heat transfer and friction characteristics in steam cooled and air cooled rectangular channels with rib turbulators" . | JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY 28 . 9 (2014) : 3845-3854 .
APA Gong, Jianying , Gao, Tieyu , Li, Guojun . Contrastive experimental study on heat transfer and friction characteristics in steam cooled and air cooled rectangular channels with rib turbulators . | JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY , 2014 , 28 (9) , 3845-3854 .
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An experimental research on the cooling performance of the turbine vane with an advanced duplex-medium combined cooling EI SCIE Scopus
期刊论文 | 2014 , 79 , 72-81 | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | IF: 2.383
WoS CC Cited Count: 3
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Abstract :

Internal steam cooling used in the vane can not only reduce the consumption of high-pressure air but also improve the overall turbine cycle efficiency. The present paper presents a research on a turbine vane with complicated cooling structure. The vane was cooled by a combination of steam and air, which was achieved by (1) cooling the leading edge with four rows of cooling air film holes; (2) cooling the middle chord area with two internal cooling steam ribbed channels; (3) cooling the trailing edge with a row of cooling air jet holes. The temperature and the static pressure were measured by the thermocouples and pressure taps located on the vane middle section. The coolant temperature and the coolant flow were then adjusted to obtain the cooling effectiveness to assess the vane cooling performance in different cooling conditions. The results of this study confirm that (1) when the test vane is applied to the advanced duplex-medium combined cooling, surface temperature can be even, accompanied with a small thermal stress as well as a high cooling effectiveness (the average cooling effectiveness was over 0.68), which implies that a satisfactory cooling performance has been achieved; (2) film cooling used at the leading edge can shift the stagnation point downstream and produce some flow losses, which, however, does not significantly affect the entire flow field of the vane passages; (3) the best cooling effect on the vane surface is in the middle chord area with internal steam cooling and its worst is on the pressure side near the trailing edge; (4) in improving cooling performance, increasing the steam flow rate is the most effective, enhancing the coolant pressure the next, and lowering the coolant temperature the least; (5) in lowering the overall vane surface temperature, lowering the coolant temperature is the most effective, increasing the steam flow rate the next, and enhancing the coolant pressure the least. (C) 2014 Elsevier Ltd. All rights reserved.

Keyword :

Steam cooling Gas turbine Heat transfer Cooling coefficient Film cooling

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GB/T 7714 Xu, Liang , Wang, Wei , Gao, Tieyu et al. An experimental research on the cooling performance of the turbine vane with an advanced duplex-medium combined cooling [J]. | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2014 , 79 : 72-81 .
MLA Xu, Liang et al. "An experimental research on the cooling performance of the turbine vane with an advanced duplex-medium combined cooling" . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 79 (2014) : 72-81 .
APA Xu, Liang , Wang, Wei , Gao, Tieyu , Gao, Jianmin . An experimental research on the cooling performance of the turbine vane with an advanced duplex-medium combined cooling . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2014 , 79 , 72-81 .
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Experimental study on cooling performance of a steam-cooled turbine blade with five internal cooling smooth channels EI SCIE Scopus
期刊论文 | 2014 , 58 , 180-187 | EXPERIMENTAL THERMAL AND FLUID SCIENCE | IF: 1.99
WoS CC Cited Count: 7
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Abstract :

Advanced cooling technology is a key measure of thermal protection for turbine blades, and raising inlet gas temperature of gas turbines. Using steam as a coolant in the internal cooling channels of turbine blade can significantly reduce the consumption of air drawn from the compressors and the closed circuits convective steam cooling can help to avoid the mixing loss between the mainstream and the cooling air so as to raise the overall efficiency of gas turbine. In this study, cooling performance comparison between the steam and air is conducted on a test blade with five smooth radial convective cooling channels. The temperature and static pressure on the surface of the mid-span of the test blade are measured and the cooling performance of the blade under different cooling conditions is evaluated. Results show that the middle region of the test blade has the highest cooling effectiveness, and then the leading edge follows. The cooling effectiveness at the trailing edge is the lowest. At the same mass flow rate, the averaged cooling effectiveness of steam cooling is higher than air by about 0.12. To obtain a similar cooling performance, the consumption of cooling steam is only 40.82% of the cooling air. In conclusion, steam cooling can achieve a better cooling performance than air, and improvements of cooling structure for the trailing edge is required for steam-cooling application in the given configuration. (C) 2014 Elsevier Inc. All rights reserved.

Keyword :

Steam cooling Gas turbine Cooling efficiency Internal cooling

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GB/T 7714 Xu, Liang , Wang, Wei , Gao, Tieyu et al. Experimental study on cooling performance of a steam-cooled turbine blade with five internal cooling smooth channels [J]. | EXPERIMENTAL THERMAL AND FLUID SCIENCE , 2014 , 58 : 180-187 .
MLA Xu, Liang et al. "Experimental study on cooling performance of a steam-cooled turbine blade with five internal cooling smooth channels" . | EXPERIMENTAL THERMAL AND FLUID SCIENCE 58 (2014) : 180-187 .
APA Xu, Liang , Wang, Wei , Gao, Tieyu , Shi, Xiaojun , Gao, Jianmin , Liang, Wanyin . Experimental study on cooling performance of a steam-cooled turbine blade with five internal cooling smooth channels . | EXPERIMENTAL THERMAL AND FLUID SCIENCE , 2014 , 58 , 180-187 .
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Investigation on the influence of inlet particle-entrained gas total temperature on the separation efficiency of gas and solid in supersonic flow EI Scopus
会议论文 | 2013 | 26th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2013
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Abstract :

Supersonic gas flow entraining solid particles changed the direction after passing through an oblique shock wave, but the solid particles maintained original movement direction due to their large inertia. So the solid particles will depart from the gas phase flow. A three-dimensional numerical simulation of gas and solid separation in supersonic flow was carried out by using ANSYS CFX software based on Euler-Lagrange model. The influence of inlet total temperature of particle-entrained gas on gas-solid two-phase flow field and the track of solid particles of different sizes was analyzed in detail. The simulation result shows that the separation efficiency of particle with diameter of 10μm is 79.09% when the total temperature of inlet particleentrained gas is 873.15K. When the total temperature of inlet particle-entrained gas is 1000K and 1100K, the separation efficiency of the particle with the same diameter will be 80.3% and 80.9% respectively. As the total temperature increases from 873.15K to 1000K and 1100K, the corresponding separation efficiency is 56.3%, 58.5%, 59.9% for the particle with diameter of 5 μm and 88.9%, 89.4%, 89.7% for the particle with diameter of 20μm. The total pressure loss of particle-entrained gas at the total temperature of 873.15K varies from 27KPa to 39KPa, which changes with the diameter of particle. The total pressure loss of particleentrained gas increases very little when the total temperature increases.

Keyword :

Oblique shock waves Pressure loss Separation efficiency Supersonic gas Total temperatures

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GB/T 7714 Zhu, Jiangnan , Gao, Tieyu , Li, Guojun . Investigation on the influence of inlet particle-entrained gas total temperature on the separation efficiency of gas and solid in supersonic flow [C] . 2013 .
MLA Zhu, Jiangnan et al. "Investigation on the influence of inlet particle-entrained gas total temperature on the separation efficiency of gas and solid in supersonic flow" . (2013) .
APA Zhu, Jiangnan , Gao, Tieyu , Li, Guojun . Investigation on the influence of inlet particle-entrained gas total temperature on the separation efficiency of gas and solid in supersonic flow . (2013) .
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Heat transfer characteristics in steam-cooled rectangular channels with two opposite rib-roughened walls EI SCIE Scopus
期刊论文 | 2013 , 50 (1) , 104-111 | APPLIED THERMAL ENGINEERING | IF: 2.624
WoS CC Cited Count: 33
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Abstract :

An experimental study of heat transfer characteristics in steam-cooled rectangular channels with two opposite rib-roughened walls for Reynolds number (Re) in the range of 10,000-80,000 was conducted. To simulate the actual geometry and heat transfer structure of turbine blade/vane internal cooling passage, each of the test channels was made by welding four stainless steel plates. The pitch-to-rib height ratio pie was kept at 10 and the channel length L was kept at 1000 mm. The channel aspect ratios (W/H) were 0.25, 0.5 and 1, respectively. The channel blockage ratios were 0.047 for W/H = 1, 0.5 and 0.078 for W/H = 0.25. We have found that the average Nusselt number (Nu) for the channel with alpha = 45 degrees is about 15-25 percent higher than that for the channel with alpha = 60 degrees. For the channels with W/H = 0.5 or 1, the average Nu decreases along the rib axes because of the rib-induced secondary flow that moves from the left-hand side to the right-hand side. In addition, based on the heat transfer results, we have developed the semi-empirical correlations for the two test channels with the highest and the lowest heat transfer. The correlations can be used in the design of the internal cooling passage of new-generation steam-cooled gas turbine blade/vane. (C) 2012 Elsevier Ltd. All rights reserved.

Keyword :

Heat transfer characteristics Gas turbine Steam-cooled Rectangular channel

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GB/T 7714 Liu, Jiazeng , Gao, Jianmin , Gao, Tieyu et al. Heat transfer characteristics in steam-cooled rectangular channels with two opposite rib-roughened walls [J]. | APPLIED THERMAL ENGINEERING , 2013 , 50 (1) : 104-111 .
MLA Liu, Jiazeng et al. "Heat transfer characteristics in steam-cooled rectangular channels with two opposite rib-roughened walls" . | APPLIED THERMAL ENGINEERING 50 . 1 (2013) : 104-111 .
APA Liu, Jiazeng , Gao, Jianmin , Gao, Tieyu , Shi, Xiaojun . Heat transfer characteristics in steam-cooled rectangular channels with two opposite rib-roughened walls . | APPLIED THERMAL ENGINEERING , 2013 , 50 (1) , 104-111 .
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Heat Transfer in Narrow Rectangular Channels with Rib Turbulators EI CPCI-S Scopus
会议论文 | 2012 , 354-355 , 1245-+ | International Conference on Energy, Environment and Sustainable Development (ICEESD 2011)
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Abstract :

An experimental study of heat transfer characteristics of narrow rectangular channels with rib turbulators for Re in the range of 10000-60000 was performed. To simulate the actual geometry and heat transfer structure of blade/vane internal cooling passage, each of the test channels was welded by four stainless steel plates. Because of the three dimensional heat conduction in the walls and heat conduction between the ribbed and smooth walls, the measured temperature distribution along the axial direction of the test channel is a smooth continuous curve, and when the Re is low, the average Nu of the ribbed and smooth walls are nearly the same. For each aspect ratio channels, the average Nu for the channel of alpha=45 degrees is about 15 to 25 percent higher than that of alpha=60 degrees. In addition, we have developed the semi-empirical correlations, covering the range of Re, to predict heat transfer coefficient of the channels. The correlations can be used in the design of turbine blade/vane cooling channels.

Keyword :

Heat transfer characteristics Gas turbine Narrow rectangular channel Rib turbulators

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GB/T 7714 Liu, Jiazeng , Gao, Jianmin , Gao, Tieyu et al. Heat Transfer in Narrow Rectangular Channels with Rib Turbulators [C] . 2012 : 1245-+ .
MLA Liu, Jiazeng et al. "Heat Transfer in Narrow Rectangular Channels with Rib Turbulators" . (2012) : 1245-+ .
APA Liu, Jiazeng , Gao, Jianmin , Gao, Tieyu , Shi, Jiaojun . Heat Transfer in Narrow Rectangular Channels with Rib Turbulators . (2012) : 1245-+ .
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Forced convection heat transfer of steam in a square ribbed channel EI SCIE Scopus
期刊论文 | 2012 , 26 (4) , 1291-1298 | JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY | IF: 0.616
WoS CC Cited Count: 21
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Abstract :

An experimental study of heat transfer characteristics of steam in a square channel (simulating a gas turbine blade cooling passage) with two opposite surfaces roughened by 60 deg parallel ribs was performed. The ranges of key governing parameters were: Reynolds numbers (Re) based on the channel hydraulic diameter (30000-140000), entry gauge pressure (0.2Mpa-0.5Mpa), heat flux of heat transfer surface area (5kWm(-2)-20kWm(-2)), and steam superheat (13 degrees C-51 degrees C). The test channel length was 1000mm, while the rib spacing (pie) was 10, and the ratio of rib height (e) to hydraulic diameter (D) was 0.048. The test channel was heated by passing current through stainless steel walls instrumented with thermocouples. The local heat transfer coefficients on the ribbed wall from the channel entrance to the fully developed regions were measured. The semi-empirical correlation was fitted out by using the average Nusselt numbers in the fully developed region to cover the range of Reynolds number. The correlation can be used in the design of new generation of gas turbine blade cooled by steam.

Keyword :

Steam cooling Gas turbine Square channel Heat transfer enhancement

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GB/T 7714 Liu, Jiazeng , Gao, Jianmin , Gao, Tieyu . Forced convection heat transfer of steam in a square ribbed channel [J]. | JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY , 2012 , 26 (4) : 1291-1298 .
MLA Liu, Jiazeng et al. "Forced convection heat transfer of steam in a square ribbed channel" . | JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY 26 . 4 (2012) : 1291-1298 .
APA Liu, Jiazeng , Gao, Jianmin , Gao, Tieyu . Forced convection heat transfer of steam in a square ribbed channel . | JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY , 2012 , 26 (4) , 1291-1298 .
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Research on the primary frequency control characteristics of generators in power system EI CPCI-S Scopus
会议论文 | 2007 , 569-+ | 2nd IEEE Conference on Industrial Electronics and Applications (ICIEA 2007)
WoS CC Cited Count: 4
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Abstract :

Primary frequency control (PFC) is one of the most important means used in maintaining frequency stability of power systems. However, as a wide dead band is usually set in the governing system of generation units with digital electro-hydraulic (DEH) control system, the function of PFC in stabilizing system frequency during system emergencies is then decreased considerably. In order to study the characteristics of PFC capabilities in generating units, a mathematical model of a three-area power system is presented in this paper. The simulation study shows that PFC capacity is necessary to maintain power system frequency stability at different dead band settings. The relationship between load disturbance and PFC capacity of the system is also studied. The proposed model will provide useful guides for setting and adjustment of governing system parameters and determination of PFC capacity of power systems.

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GB/T 7714 Dai, Yiping , Zhao, Ting , Tian, Yunfeng et al. Research on the primary frequency control characteristics of generators in power system [C] . 2007 : 569-+ .
MLA Dai, Yiping et al. "Research on the primary frequency control characteristics of generators in power system" . (2007) : 569-+ .
APA Dai, Yiping , Zhao, Ting , Tian, Yunfeng , Gao, Lin . Research on the primary frequency control characteristics of generators in power system . (2007) : 569-+ .
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