超临界射流掺混控制中激励振幅的影响  

Influence of excitation amplitude on mixing control of a supercritical jet

作　　者：原敏鹏 冯岩岩 向勇 宋彦萍[2] YUAN Minpeng;FENG Yanyan;XIANG Yong;SONG Yanping(Beijing Key Laboratory of Process Fluid Filtration and Separation,College of Mechanical and Transportation Engineering,China University of Petroleum(Beijing),Beijing 102249,China;School of Energy Science and Engineering,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]中国石油大学(北京)机械与储运工程学院过程流体过滤与分离技术北京市重点实验室,北京102249 [2]哈尔滨工业大学能源科学与工程学院,哈尔滨150001

出　　处：《航空动力学报》2024年第10期241-251,共11页Journal of Aerospace Power

基　　金：中国石油大学(北京)科研基金(2462021YJRC005)。

摘　　要：针对超临界氮气圆形湍流射流,采用雷诺平均数值模拟方法,研究了不同雷诺数条件下曲张激励模态的振幅对类气态射流掺混流场特性的影响。结果表明:在研究的雷诺数范围内(1.5×10^(5)~6.1×10^(5),基于射流孔径),无激励射流势核长度和扩张角基本保持不变,超临界氮气射流混合受雷诺数影响较小;雷诺数较低时(小于2.3×10^(5)),随激励振幅的增加,射流掺混效果增强,25%振幅控制下射流密度势核可缩短58%,扩张角增大87%,曲张激励有效提升了射流出口的传热性能并解除固壁效应;雷诺数较高时(高于3.0×10^(5)),射流的湍动能升高,剪切层变薄,层内速度、密度和温度梯度更大,控制增强掺混的难度增加,当雷诺数为6.1×10^(5)时,射流密度势核缩短和扩张角增大程度约为较低雷诺数条件下的76%和23%,雷诺数对掺混控制效果有较大的影响。Based on a supercritical nitrogen circular turbulent jet,the mixing control effect by using varicose excitation was investigated using Reynolds-averaged numerical simulations.The mixing characteristics of the gas-like jet were analyzed under different excitation amplitudes and Reynolds numbers.The results showed that the potential core length and diffusion angle of unexcited jet remain basically unchanged within the studied range of Reynolds number(1.5×10^(5)—6.1×10^(5),based on jet diameter).The Reynolds number had little effect on the mixing of supercritical nitrogen jet.For relatively low Reynolds numbers(less than 2.3×10^(5)),jet mixing was enhanced with increasing excitation amplitude.The jet density potential core was shortened maximumly by 58%and the diffusion angle was increased by 87%with 25%control amplitude.Meanwhile,the varicose excitation effectively improved the heat transfer performance near the jet exit,relieving the solid wall effect.For higher Reynolds numbers(higher than 3.0×10^(5)),the jet turbulent kinetic energy of the increased,with a thinner shear layer and a larger velocity,density and temperature gradient in it,causing difficulty of jet mixing control.For a Reynolds number of 6.1×10^(5),the changes of jet density potential core and diffusion angle were about 76%and 23%of those under lower Reynolds number condition.Reynolds number had a significant influence on the effect of jet mixing control.

关 键 词：超临界射流 射流控制 曲张模态 激励振幅 雷诺数 

分 类 号：V434.13[航空宇航科学与技术—航空宇航推进理论与工程]