冲压旋转爆震发动机隔离段抗反压特性数值研究  

Numerical Research on Anti-Backpressure Characteristics of Isolator of Ramjet Rotating Detonation Engine

作　　者：张鑫 马虎[2] Zhang Xin;Ma Hu(Chinese Flight Test Establishment,Xi′an 710089,Shaanxi,China;School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China)

机构地区：[1]中国飞行试验研究院,陕西西安710089 [2]南京理工大学机械工程学院,江苏南京210094

出　　处：《工程与试验》2023年第3期21-24,41,共5页Engineering and Test

摘　　要：冲压旋转爆震发动机(RRDE)的进气道和燃烧室通常通过隔离段连接,实现抑制旋转爆震燃烧室非定常压力扰动对定常进气道造成的影响,但目前针对RRDE隔离段的研究相对较少。本文利用FLUENT对4种RRDE隔离段构型进行三维数值研究,分析了拟合旋转反压作用下不同构型隔离段的流场结构和总压损失。研究结果表明,在给定反压条件下,前传斜激波会在扩张段内形成激波串,激波串的首道激波波面不完全垂直于隔离段轴线;凹腔隔离段能够对前传斜激波起到削弱作用,扩张段内的激波串位置会发生前移,流场总压损失减小,且随着凹腔深度的增加,相对总压损失系数减小,总压恢复系数增大。本研究结果对了解RRDE隔离段流场结构、指导RRDE隔离段设计具有一定的参考意义。Generally,the inlet and combustor of ramjet rotating detonation engine(RRDE)are connected by isolator to suppress the influence of unsteady pressure disturbance of the rotating detonation combustor on the steady inlet,but the research on RRDE isolator is relatively less at present.In this paper,FLUENT is used to carry out three-dimensional numerical research on four types of RRDE isolator,and the flow field structure and total pressure loss of different configurations of isolator under the effect of fitting rotating back pressure are analyzed.The results show that the forward oblique shock will form a shock train in the expansion section under a given back pressure,and the first shock wave surface of the shock train is not completely perpendicular to the axis of the isolator.The cavity isolator can weaken the forward oblique shock wave,and the shock train position in the expansion section will move forward,and the total pressure loss of the flow field will decrease.With the increase of the cavity depth,the relative total pressure loss will decrease,and the total pressure recovery will increase.The research results have certain reference significance for understanding the flow field structure of RRDE isolator and guiding the design of RRDE isolator.

关 键 词：冲压旋转爆震发动机 隔离段 旋转反压 抗反压特性 

分 类 号：V23[航空宇航科学与技术—航空宇航推进理论与工程]