Experiment on Wedge-Shaped Latticework Channel Cooling Applied in Aero Engine Gas Turbine Blade Trailing Edge

doi:10.16183/j.cnki.jsjtu.2021.162

Abstract

Abstract:

In order to study the flow and heat transfer performance of wedge-shaped latticework channels in the turbine blade trailing edge, this paper conducted an experimental study by employing the transient liquid crystal (TLC) technique to investigate the local heat transfer characteristics of the upper and lower main surfaces and applying the pressure scanning valve to mesure the pressure loss of the channels at different Reynolds numbers. The experiment shows that there is a significant difference between the upper and lower main surfaces under the turning flow configuration condition at the trailing edge section. The average Nusselt number of the lower main surface is over 30% higher than that of the upper main surface. In heat transfer coefficient, the wedge-shaped latticework channel is over 46% higher than that of the needle rib channel. There is a strong mass exchange at the interface between the upper and lower channels of the latticework channel. The intermittent high heat transfer areas on the upper and lower main surfaces are corresponding to the interface. As the inlet Reynolds number increases, the channel pressure drop increases rapidly. The pressure drop of the wedge-shaped latticework channel is 5 to 7 times that of the needle ribs, but the heat transfer area of latticework channel is 107.4% higher than the needle ribs channel, and the overall thermal performance of the wedge-shaped latticework channel is still approximately 66% higher than that of the needle ribs channel.

Key words: turbine blade trailing edge, latticework cooling, flow and heat transfer, transient liquid crystal (TLC)

CLC Number:

TK124

XIAO Kehua, LUO Jiahao, RAO Yu. Experiment on Wedge-Shaped Latticework Channel Cooling Applied in Aero Engine Gas Turbine Blade Trailing Edge[J]. Journal of Shanghai Jiao Tong University, 2022, 56(8): 1034-1042.

Figures/Tables 15

Fig.1

Fig.2

Fig.3

Tab.1

Fig.4

Fig.5

Fig.6

Fig.7

Fig.8

Fig.9

Fig.10

Fig.11

Fig.12

Fig.13

Fig.14

References 18

[1]	HAN J C, DUTTA S, EKKAD S. Gas turbine heat transfer and cooling technology[M]. New York, USA: CRC Press, 2012.
[2]	BUNKER R S. Latticework (vortex) cooling effectiveness-Part 1: Stationary channel experiments[C]// Proceedings of ASME Turbo Expo 2004: Power for Land, Sea, and Air, Vienna, Austria: International Gas Turbine Institute, 2008: 909-918.
[3]	ACHARYA S, ZHOU F, LAGRONE J, et al. Latticework(vortex) cooling effectiveness: Rotating channel experiments[J]. Journal of Turbomachinery, 2005, 127(3): 471-478. doi: 10.1115/1.1860381 URL
[4]	GORELOV V, GOIKHENBERG M, MALKOV V. The investigation of heat transfer in cooled blades of gas turbines[C]// 26th Joint Propulsion Conference. Reston, Virginia: AIAA, 1990: 1-4.
[5]	GILLESPIE D R H, IRELAND P T, DAILEY G M. Detailed flow and heat transfer coefficient measurements in a model of an internal cooling geometry employing orthogonal intersecting channels[C]// Proceedings of ASME Turbo Expo 2000: Power for Land, Sea, and Air, Munich, Germany: International Gas Turbine Institute, 2014: 1-8.
[6]	邓宏武, 谭艳, 王佳仁, 等. 带交错肋结构涡轮叶片复合通道的实验[J]. 航空动力学报, 2010, 25(9): 1931-1937.
	DENG Hongwu, TAN Yan, WANG Jiaren, et al. Experimental study on the turbine blade cooling channel with crossed-ribs[J]. Journal of Aerospace Power, 2010, 25(9): 1931-1937.
[7]	邓宏武, 潘文艳, 陶智, 等. 开槽交错肋通道换热和流阻特性[J]. 北京航空航天大学学报, 2007, 33(10): 1158-1161.
	DENG Hongwu, PAN Wenyan, TAO Zhi, et al. Heat transfer and flow resistance in a notched crossed-rib channel[J]. Journal of Beijing University of Aeronautics and Astronautics, 2007, 33(10): 1158-1161.
[8]	RAO Y, ZANG S S. Flow and heat transfer characteristics in latticework cooling channels with dimple vortex generators[J]. Journal of Turbomachinery, 2014, 136(2): 021017. doi: 10.1115/1.4025197 URL
[9]	PARDESHI I, SHIH TOMI P, BRYDEN K M., et al. Flow and heat transfer in a rotating and non-rotating wedge-shaped cooling passage with ribs and pin fins[C]// 53rd AIAA Aerospace Sciences Meeting. Reston, Virginia: AIAA, 2015: 1-10.
[10]	WAGNER G, KOTULLA M, OTT P, et al. The transient liquid crystal technique: Influence of surface curvature and finite wall thickness[J]. Journal of Turbomachinery, 2005, 127(1): 175-182. doi: 10.1115/1.1811089 URL
[11]	EKKAD S V, HAN J C. A transient liquid crystal thermography technique for gas turbine heat transfer measurements[J]. Measurement Science and Technology, 2000, 11(7): 957-968. doi: 10.1088/0957-0233/11/7/312 URL
[12]	许亚敏, 饶宇. 液晶热像测量精度分析及其在湍流传热研究中的应用[J]. 上海交通大学学报, 2013, 47(8): 1185-1190.
	XU Yamin, RAO Yu. Measurement accuracy and application of liquid crystal thermography technique in turbulent flow heat transfer[J]. Journal of Shanghai Jiao Tong University, 2013, 47(8): 1185-1190.
[13]	SCHULZ S, BRACK S, TERZIS A, et al. On the effects of coating thickness in transient heat transfer experiments using thermochromic liquid crystals[J]. Experimental Thermal and Fluid Science, 2016, 70: 196-207. doi: 10.1016/j.expthermflusci.2015.08.011 URL
[14]	MOFFAT R J. Describing the uncertainties in experimental results[J]. Experimental Thermal and Fluid Science, 1988, 1(1): 3-17. doi: 10.1016/0894-1777(88)90043-X URL
[15]	CARCASCI C, FACCHINI B, PIEVAROLI M, et al. Heat transfer and pressure drop measurements on rotating matrix cooling geometries for airfoil trailing edges[C]// Proceedings of ASME Turbo Expo 2015: Turbine Technical Conference and Exposition, Montreal, Quebec, Canada: International Gas Turbine Institute, 2015: 1-13.
[16]	SAHA K, ACHARYA S, NAKAMATA C. Heat transfer enhancement and thermal performance of lattice structures for internal cooling of airfoil trailing edges[J]. Journal of Thermal Science and Engineering Applications, 2013, 5(1): 011001. doi: 10.1115/1.4007277 URL
[17]	LIANG C, RAO Y, LUO, J, et al. Experimental and numerical study of turbulent flow and heat transfer in a wedge-shaped channel with guiding pin fins for turbine blade trailing edge cooling[J]. International Journal of Heat and Mass Transfer, 2021, 178: 121590. doi: 10.1016/j.ijheatmasstransfer.2021.121590 URL
[18]	GEE D L, WEBB R L. Forced convection heat transfer in helically rib-roughened tubes[J]. International Journal of Heat and Mass Transfer, 1980, 23(8): 1127-1136. doi: 10.1016/0017-9310(80)90177-5 URL

参数	取值
β/(°)	35
L/mm	300
b_tot/mm	105
b/mm	6
w/mm	15
n	16
h_in/mm	14.35
h_out/mm	5.25
d_{sub, ave}/ mm	11.22
A_wet/mm²	190188