摘要
对喷管出口接近真空情况一维稳态可压缩微喷管内流体进行了理论分析,研究了微喷管几何结构参数,喷管入口流体压力,喷管入口流体温度,喷管出口环境背压和不同工质对喷管出口性能参数的影响,并进行了一维微喷管绝热等熵计算程序设计。针对喉部宽度为19μm,刻蚀深度为300μm,几何扩张比为5.4的微喷管进行了数值计算,计算结果表明:随着微喷管入口流体压力的增加,流体的流量增加,喷管出口推力增大,喉部特征雷诺数增加;在相同的微喷管入口压力下,随着微喷管入口流体温度的增加,喷管出口的比冲增加;随着微喷管出口环境背压的增加,微喷管出口的比冲随之减小;对于不同流体工质,微喷管性能参数受工质摩尔质量、分子内原子数目和动力黏度影响。
The compressible fluid was studied by one-dimensional steady state calculating and analyzing in- side the micro-nozzle of which the outlet is close to vacuum. The impact of micro-nozzle geometry parame- ters, inlet pressure, inlet temperature, outlet ambient pressure and different working fluid were analyzed. Also the one-dimensional adiabatic isentropic program was designed. Simultaneously the calculi/ring was complemented for the nozzle of which the throat width was 19 p,m, the etching depth was 300 p,m and the geometry expansion ratio was 5.4. The numerical results show that with the inlet pressure being increases, the mass flow, micro-nozzle outlet thrust and the throat features Reynolds increases accordingly. At the same inlet pressure, the special impulse is increased with the inlet temperature being increased while the special impulse is decreased with the outlet ambient pressure being increased accordingly. For different working fluids, the micro nozzle performances are affected by molar mass, the number of atoms of a molecule and dynamic viscosity.
出处
《四川兵工学报》
CAS
2015年第4期127-131,共5页
Journal of Sichuan Ordnance
基金
国家重点基础研究发展项目(2011CB201500)
广东省博士启动项目(1209386)
关键词
流量
推力
比冲
微喷管
mass flow
thrust force
special impulse
micro-nozzle
