大梯度混合层流场特性及能量传递规律研究  

Flow Field Characteristics of High-Gradient Mixing Layers and Laws of Energy Transfer

作　　者：杨一丁 张净玉[1] 刘鸣 何小民[1] YANG Yiding;ZHANG Jingyu;LIU Ming;HE Xiaomin(College of Energy and Power Engineering,Nanjing University of Aeronautics&Astronautics,Nanjing 210016,China)

机构地区：[1]南京航空航天大学能源与动力学院,南京210016

出　　处：《南京航空航天大学学报(自然科学版)》2025年第2期337-348,共12页Journal of Nanjing University of Aeronautics & Astronautics

摘　　要：针对内置小流量火箭燃气助燃的亚燃冲压发动机(Rocket⁃assisted ramjet engine,RARE)中,大梯度混合层流场特性及能量传递规律,开展了火箭侧马赫数(1.2~2.0)、总温比(2~4)等来流参数对混合层无量纲厚度变化、动能和热能传递规律的数值仿真研究。研究结果表明,在流体混合50 mm后混合层内达到自相似模态,总温比变化对混合层无量纲增长率影响更明显;两侧流体动能交换主要发生在混合层内,而热量可以从未掺混火箭侧经过混合层,传递到未掺混冲压侧。助燃火箭向冲压燃烧室的热量传递大小主要取决于两侧总温比,总温比从2增加到4,冲压侧的静焓增长量提高近4倍。A numerical simulation study is conducted on the flow field characteristics and laws of energy transfer of the high-gradient mixing layer in a rocket-assisted ramjet engine(RARE).The study focuses on the effects of incoming flow parameters,such as the rocket-side Mach number(1.2—2.0)and total temperature ratio(2—4),on the dimensionless thickness variation of the mixing layer,as well as the kinetic and thermal energy transfer laws.The research results indicate that after 50 mm of mixing between the two fluid streams,the mixing layer has already reached a self-similar mode.The variation in the total temperature ratio has a more pronounced effect on the dimensionless growth rate of the mixing layer.The exchange of kinetic energy between the two fluids primarily occurs within the mixing layer.Heat can transfer from the unmixed rocket filed,across the mixing layer,to the unmixed ramjet filed.The heat transfer from the rocket to the ramjet combustion chamber mainly depends on the total temperature ratio on both sides.When the total temperature ratio increases from 2 to 4,the static enthalpy increase on the ramjet side is nearly fourfold.

关 键 词：火箭基组合循环 亚燃冲压发动机 超/亚声速混合层 剪切层 能量传递 

分 类 号：V236[航空宇航科学与技术—航空宇航推进理论与工程]