旋转爆轰冲压发动机隔离段构型对其抗反压特性影响研究  

Study on the influence of isolator configuration of rotating detonation ramjet engine on its anti-backpressure characteristics

作　　者：吴鑫罡 郑权[1] 黄亚坤 翁春生[1] Wu Xingang;Zheng Quan;Huang Yakun;Weng Chunsheng(National Key Laboratory of Transient Physics,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学瞬态物理全国重点实验室,江苏南京210094

出　　处：《南京理工大学学报》2025年第1期113-124,共12页Journal of Nanjing University of Science and Technology

基　　金：国家自然科学基金(12272185)。

摘　　要：隔离段的构型是影响其抗反压特性的重要因素之一。为了探究隔离段构型对其抗反压特性的影响,建立9种不同长度、宽度构型的隔离段,对其进行三维数值模拟,主要分析了不同构型隔离段对流场结构、首道激波位置以及沿程静压和沿程总压损失的影响。研究发现,在同一来流情况下,固定隔离段长度,增加宽度会使激波串长度减小,激波串波节数减少,激波串向上游推进的距离变小,首道激波位置更靠近下游,隔离段抗反压特性能力增强,总压损失有所减小,当宽度由5 mm增加至7 mm时,抗反压能力增强明显,由7 mm增加至10 mm时,增强趋势有所变缓;固定隔离段宽度,增加长度会使激波串长度增加,激波串波节数不变,但激波串对隔离段的影响占隔离段总长度比例减小,首道激波位置更靠近下游,隔离段抗反压特性能力增强,沿程总压损失有所增大,当长度由60 mm增加至80 mm时抗反压能力增强明显,由80 mm增加至100 mm时,增强趋势有所变缓。该文研究可为旋转爆轰冲压发动机隔离段的设计提供参考。The configuration of the isolator is one of the important factors that affect its anti-backpressure characteristics.To investigate the influence of isolator configuration on its anti-backpressure characteristics,nine different length and width configurations of the isolator are established,and three-dimensional numerical simulations are conducted.The main focus is on analyzing the effects of different configurations of the isolator on flow field structure,position of the first shock wave,and along-stream static pressure and total pressure losses.The study founds that,under fixed isolator length with same incoming flow conditions,increasing the width of the isolator results in a decrease in the length and node number of shock train,a shorter distance of shock train propagation upstream,a downstream shift in the position of the first shock wave,an enhancement in the anti-backpressure capability of the isolator,and a reduction in total pressure losses.The enhancement in anti-backpressure capability is significant when the width increases from 5 mm to 7 mm,but the enhancement trend slows down when the width increases from 7 mm to 10 mm.On the other hand,under fixed isolator width with same incoming flow conditions,increasing the length of the isolator leads to an increase in the length of shock train,while the node number of shock train remains constant.However,the proportion of the isolator affected by shock train decreases as the length increases.Additionally,there is a downstream shift in the position of the first shock wave,an enhancement in the anti-backpressure capability of the isolator,and an increase in total pressure losses.The enhancement in anti-backpressure capability is significant when the length increases from 60 mm to 80 mm,but the enhancement trend slows down when the length increases from 80 mm to 100 mm.This study provides a reference for the design of the isolator in rotating detonation ramjet engines.

关 键 词：爆轰发动机 隔离段构型 旋转反压 激波串 流场结构 

分 类 号：V231.2[航空宇航科学与技术—航空宇航推进理论与工程]