单排突片激励热射流作用下楔形凹腔表面对流换热研究
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摘要
为了改善发动机整流支板凹腔防冰结构热气射流冲击换热效果,在常规圆形射流孔上采取了突片激励,通过三维内外流耦合数值模拟的方法研究了突片数量、突片穿透比(l/d)以及射流冲击间距(H/d)对楔形凹腔表面换热的影响。研究结果表明:突片能够提高射流核心区的速度和湍流动能,使得冲击换热效果增强;相对于圆形射流孔,4-tabs,6-tabs和8-tabs所对应的的楔形凹腔表面温度和Nu数分别提高了1.2K,2.3K,2.8K和17%,28%,33%;凹腔表面温度随着突片穿透比的增大而有所提高;射流冲击间距(H/d)对凹腔内部对流换热有很大的影响,无突片激励作用时,H/d=6的凹腔表面最高温度和Nu数比H/d=12提高了7.2K和67%;在突片激励作用下,H/d=6时的凹腔表面最高温度和Nu数分别比H/d=12时提高了8.5K和90%。突片数量和突片穿透比的增大都会引起次流总压损失的增加。
To improve impingement heat transfer used by the hot-air jets which act on the wedge-shaped concave surface of aero-engine anti-icing inlet strut,the tabbed excitation was adopted for the conventional round jet. Three-dimensional inner-flow and outer-flow conjugate heat transfer simulations were conducted to investigate the effects of tab number,tab penetration ratio(l/d) and jet impinging distance(H/d) on the heat transfer performance of the wedge-shaped concave surface. The results show that the tabs increase the core velocity and turbulent kinetic energy of the jet,and improve the convective heat transfer of jet impingement. In relative to the conventional impinging jet without tabs,the temperature of the wedge-shaped concave surface on the condition of 4-tabs,6-tabs and 8-tabs increased by 1.2K,2.3K,2.8K and the Nusselt numbers increased by17%,28%,33%,respectively. The temperature of concave surface also increased with the tab penetration ratio. The impingement distance has a significant influence on the convective heat transfer of the concave surface.The surface temperature and Nusselt numbers of H/d=6 increased 7.2K and 67%,respectively,compared with H/d=12 without the effects of tabbed excitation. On the other hand,the surface temperature and Nusselt numbers of H/d=6 increased 8.5K and 90%,respectively,compared with H/d=12 with the effects of tabbed excitation.Total pressure loss of second flow increases with the increasing of the tab numbers and tab penetration length ratio.
To improve impingement heat transfer used by the hot-air jets which act on the wedge-shaped concave surface of aero-engine anti-icing inlet strut,the tabbed excitation was adopted for the conventional round jet. Three-dimensional inner-flow and outer-flow conjugate heat transfer simulations were conducted to investigate the effects of tab number,tab penetration ratio(l/d) and jet impinging distance(H/d) on the heat transfer performance of the wedge-shaped concave surface. The results show that the tabs increase the core velocity and turbulent kinetic energy of the jet,and improve the convective heat transfer of jet impingement. In relative to the conventional impinging jet without tabs,the temperature of the wedge-shaped concave surface on the condition of 4-tabs,6-tabs and 8-tabs increased by 1.2K,2.3K,2.8K and the Nusselt numbers increased by17%,28%,33%,respectively. The temperature of concave surface also increased with the tab penetration ratio. The impingement distance has a significant influence on the convective heat transfer of the concave surface.The surface temperature and Nusselt numbers of H/d=6 increased 7.2K and 67%,respectively,compared with H/d=12 without the effects of tabbed excitation. On the other hand,the surface temperature and Nusselt numbers of H/d=6 increased 8.5K and 90%,respectively,compared with H/d=12 with the effects of tabbed excitation.Total pressure loss of second flow increases with the increasing of the tab numbers and tab penetration length ratio.
引文
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[15]Koseoglu M F,Baskaya S.The Role of Jet Inlet Geometry in Impinging Jet Heat Transfer,Modeling and Experiments[J].International Journal of Thermal Science,2010,49(8):1417-1426.
[16]Nanan K,Wongcharee K,Nuntadusit C,et al.Forced Convective Heat Transfer by Swirling Impinging Jets Issuing from Nozzles Equipped with Twisted Tapes[J].International Communications in Heat and Mass Transfer,2012,39(6):844-852.
[17]Violato D,Ianiro A,Cardone G,et al.Three-Dimensional Vortex Dynamics and Convective Heat Transfer in Circular and Chevron Impinging Jets[J].International Journal of Heat and Fluid Flow,2012,37:22-36.
[18]Papadakis M,Wong S,Yeong H,et al.Icing Tunnel Experiments with a Hot Air Anti-Icing System[R].AIAA 2008-444.
[2]Jeanne G M.The Ice Particle Threat to Engines in Flight[R].AIAA 2006-206.
[3]Al-Khalil K,Hitizigrath R,Philippi O,et al.Icing Analysis and Test of a Business Jet Engine Inlet Duct[R].AIAA 2000-1040.
[4]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.
[5]Fregeau M,Gabr M,Paraschivoiu I,et al.Simulation of Heat Transfer from Hot-Air Jets Impinging a ThreeDimensional Concave Surface[J].Journal of Aircraft,2009,46(2):721-725.
[6]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.
[7]Nirmalkumar,Katti V,Prabhu S V.Local Heat Transfer Distribution on a Smooth Flat Plate Impinged by a Slot Jet[J].International Journal of Heat and Mass Transfer,2011,54(3):727-738.
[8]Metzger D E,Yamashita T,Jenkins C.Impingement Cooling of Concave Surfaces with Lines of Circular Air Jets[J].Transfer of Journal Engineering Power,1971,91:149-158.
[9]Chupp R,Helms H,Mc Fadden P,et al.Evaluation of Internal Heat-Transfer Coefficients for Impingement Cooled Turbine Airfoils[J].Journal of Aircraft,1969,6(3):203-208.
[10]Yang G,Choi M,Lee J S.An Experimental Study of Slot Jet Impingement Cooling on Concave Surface:Effects of Nozzle Configuration and Curvature[J].International Journal of Heat and Mass Transfer,1999,42(12):2199-2209.
[11]李鑫,毛军逵,王小平,等.双层壳型涡轮叶片中冲击选流换热增益效果试验[J].推进技术,2010,31(3):325-330.(LI Xin,MAO Jun-kui,WANG Xiaoping,et al.Experiments on Heat Transfer Enhancement with Vortex in a Double Decker Jet/Film Cooling Strcture[J].Journal of Propulsion Technology,2010,31(3):325-330.)
[12]San J Y,Chen J J.Effects of Jet-to-Jet Spacing and Jet Height on Heat Transfer Characteristics of an Impinging Jet Array[J].International Journal of Heat and Mass Transfer,2014,71:8-17.
[13]Gao N,Sun H,Ewing D.Heat Transfer to ImpingingRound Jets with Triangular Tabs[J].International Journal of Heat and Mass Transfer,2003,46(14):2557-2569.
[14]余业珍,张靖周,谭晓茗.涡激励突片射流冲击冷却的数值研究和试验验证[J].推进技术,2008,29(2):163-167.(YU Ye-zhen,ZHANG Jing-zhou,TAN Xiao-ming.Numerical Investigation and Experimental Examination on Jet Impingement with Vortex-Generating Tabs[J].Journal of Propulsion Technology,2008,29(2):163-167.)
[15]Koseoglu M F,Baskaya S.The Role of Jet Inlet Geometry in Impinging Jet Heat Transfer,Modeling and Experiments[J].International Journal of Thermal Science,2010,49(8):1417-1426.
[16]Nanan K,Wongcharee K,Nuntadusit C,et al.Forced Convective Heat Transfer by Swirling Impinging Jets Issuing from Nozzles Equipped with Twisted Tapes[J].International Communications in Heat and Mass Transfer,2012,39(6):844-852.
[17]Violato D,Ianiro A,Cardone G,et al.Three-Dimensional Vortex Dynamics and Convective Heat Transfer in Circular and Chevron Impinging Jets[J].International Journal of Heat and Fluid Flow,2012,37:22-36.
[18]Papadakis M,Wong S,Yeong H,et al.Icing Tunnel Experiments with a Hot Air Anti-Icing System[R].AIAA 2008-444.