摘要
为对液氧/液甲烷(LOX/LCH4)针栓式喷注器的优化设计提供指导,设计了具有矩形燃烧室的氧化剂中心式液氧/液甲烷针栓式喷注器,通过数值模拟探究其在不同喷注压降条件下的喷雾燃烧特性。结果表明:当保证各路推进剂质量流量不变时,增加径向液氧喷注压降会减小阻塞因子,不利于轴向液甲烷的快速雾化,会促进燃烧高温向喷管扩散,导致较低的燃烧效率;增加轴向液甲烷喷注压降会减小总动量比,不利于燃烧室头部贫氧流场的形成,容易促进燃烧室头部局部燃烧高温的发展;两路推进剂压降的最佳取值均为室压的22%。针栓式喷注器两股推进剂的撞击方式有利于化学能量的快速扩散,形成稳定的涡结构与剪切式火焰,能够保证良好的燃烧稳定性。
To guide the optimization design of a liquid oxygen/liquid methane(LOX/LCH4)pintle injector,an oxidant-centered LOX/LCH4 pintle injector with a rectangular combustion chamber was processed,and its spray and combustion characteristics were explored through numerical simulation under different pressure drop conditions.Results showed that when the mass flow rate of each propellant was kept constant,increasing the pressure drop of radial LOX could decrease the block factor,which was not conducive to the rapid atomization of the axial LCH4,contributing to the development of the high combustion temperature towards the nozzle,and leading to lower combustion efficiency.Increasing the pressure drop of the axial LCH4 could decrease the total momentum ratio,which was not helpful for the formation of the poor-oxygen region on the head of the combustion chamber,resulting in the development of a local high combustion temperature.The optimal value of the pressure drop of both propellants was 22%of the combustion chamber pressure.The impact way of the two propellants of the pintle injector was beneficial to the rapid diffusion of chemical energy and can form stable vortices and shear layer flame,thus ensuring good combustion stability.
作者
周睿
李军
沈赤兵
ZHOU Rui;LI Jun;SHEN Chibing(Guangzhou Institute of Energy Conversion,Chinese Academy of Sciences,Guangzhou 510640,China;Science and Technology on Scramjet Laboratory,College of Aerospace Science and Engineering,National University of Defense Technology,Changsha 410073,China)
出处
《航空动力学报》
北大核心
2025年第8期311-320,共10页
Journal of Aerospace Power
基金
国家自然科学基金(12072367)。
关键词
液氧/液甲烷
针栓式喷注器
喷注压降
索太尔平均粒径
燃烧效率
liquid oxygen
liquid methane
pintle injector
injection pressure drop
Sauter mean diameter
combustion efficiency
