Impingement heat transfer inside wedge-shaped concave by jets from impingment plate with front-extended port
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摘要: 针对楔形凹腔内带前伸槽冲击板结构开展了传热特性的试验研究,分析了冲击板前伸槽伸出长度比(5~11)、前伸槽宽度比(2.5~8)和射流雷诺数(7900~31700)等参数对凹腔表面温度、展向平均努塞尔数和面积平均努塞尔数以及射流压力损失的影响.研究结果表明:相对于基准冲击板,带前伸槽的冲击板能够使得凹腔的射流冲击对流换热较基准冲击板有较大幅度的改善,但引起较大的射流压力损失;前伸槽伸出长度的增大使得凹腔表面射流冲击对流换热有较显著的增强,对射流压力损失的影响很小;增大冲击板前伸槽宽度可以使得凹腔表面对流换热得到一定程度的强化,但也会造成压力损失的增大.Abstract: Experimental analysis was conducted to investigate the heat transfer inside a wedge-shaped concave by a row of jets from impingment plate with front-extended port. The effect of front-extended port extension spacing ratio (5~11), front-extended port width spacing ratio (2.5~8) and jet Reynolds number (7900~31700)on the concave surface temperature distribution, spanwised-averaged Nusselt numbers,area-averaged Nusselt numbers and jet pressure loss were experimentally tested. The results indicated that the convective heat transfer of impinging plate with front-extended port was obviously enhanced compared with baseline plate, the front-extended port caused high jet pressure loss. The convective heat transfer of concave surface was significantly improved with the increase of front-extended port extension spacing ratio, yielding little effect on jet pressure loss. Convective heat transfer of concave surface was enhanced with increase of front-extended port width spacing ratio, however, the total pressure loss increased also.
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[1] Cebeci T,Kafyeke F.Aircraft icing[J].Annual Review of Fluid Mechanics,2003,35:11-21. [2] Brawn J K,Raghunathan S,Watterson J K,et al.Heat transfer correlation for Anti-icing systems[J].Journal of Aircraft,2002,39(1):65-70. [3] Pellissier M P C,Habashi W G,Pueyo A.Optimization via FENSAP-ICE of aircraft hot-air anti-icing system[J].Journal of Aircraft,2011,48(1):265-276. [4] Viskanta R.Heat transfer to impinging isothermal gas and flame jets[J].Experimental Thermal and Fluid Science,1993,6(2):111-134. [5] Weigand B,Spring S.Multiple jet impingement:a review[J].Heat Transfer Research,2011,42(2):101-142. [6] Choi M,Yoo H S,Yang G,et al.Measurements of impinging jet flow and heat transfer on a semi-circular concave surface[J].International Journal of Heat and Mass Transfer,2000,43(10):1811-1822. [7] Kayansayan N,Kucuka S.Impingement cooling of a semi-cylindrical concave channel by confined slot air jet[J].Experimental Thermal and Fluid Science,2001,25(6):383-396. [8] Fregeau M,Gabr M,Paraschivoiu I,et al.Simulation of heat transfer from hot-air jets impinging a three-dimensional concave surface[J].Journal of Aircraft,2009,46(2):721-726. [9] Sharif M A R,Mothe K K.Parametric study of turbulent slot-jet impingement heat transfer from concave cylindrical surfaces[J].International Journal of Thermal Sciences,2010,49(2):428-442. [10] Oztekin E,Aydin O,Avci M.Heat transfer in a turbulent slot jet flow impinging on concave surfaces[J].International Communications in Heat and Mass Transfer,2013,44(5):77-82. [11] GUAN Tao,ZHANG Jingzhou,SHAN Yong.Convective heat transfer by tab-excited impinging jets on a wedge-shaped concave surface[J].International Journal of Thermal Sciences,2016,10:37-53. [12] BU Xueqin,PENG Long,LIN Guiping,et al.Experimental study of jet impingement heat transfer on a variable-curvature concave surface in a wing leading edge[J].International Journal of Heat and Mass Transfer,2015,90:92-101. [13] Esposito E I,Ekkad S V,Kim Y.Novel jet impingement cooling geometry for combustor liner backside cooling[J].Journal of Thermal Science and Engineering Applications,2009,1(2):427-432. [14] TAN Xiaoming,ZHANG Jingzhou.Flow and heat transfer characteristics under synthetic jets impingement driven by piezoelectric actuator[J].Experimental Thermal and Fluid Science,2013,48(7):134-146. [15] YU Yezhen,ZHANG Jingzhou,XU Huasheng.Convective heat transfer by a row of confined air jets from round holes equipped with triangular tabs[J].International Journal of Heat and Mass Transfer,2014,72:222-233. [16] SHAN Yong,ZHANG Jingzhou,XIE Gongnan.Convective heat transfer for multiple rows of impinging air jets with small jet-to-jet spacing in a semi-confined channel[J].International Journal of Heat and Mass Transfer,2015,86:832-842. [17] Cardone M,Ligrani P,Fox M,et al.Infrared thermography for convective heat transfer measurements[J].Journal of Thermophysics and Heat Transfer,2010,24:133-144. [18] Moffat R J.Describing the uncertainties in experimental results[J].Experimental Thermal and Fluid Science,1988,1(1):3-17.
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