微型拉瓦尔喷管的流体仿真分析和优化  

FLUID SIMULATING ANALYSIS AND OPTIMIZATION OF MICRO LAVAL NOZZLE

作　　者：喻巍岭 冯煜东[1] 周晖[1] 曹生珠[1] 张晓宇 YU Wei-ling;FENG Yu-dong;ZHOU Hui;CAO Sheng-zhu;ZHANG Xiao-yu(Science and Technology on Vacuum Technology and Physics Laboratory,Lanzhou Institute of Physics,Lanzhou 730000,China)

机构地区：[1]兰州空间技术物理研究所真空技术与物理重点实验室,兰州730000

出　　处：《真空与低温》2018年第4期246-250,共5页Vacuum and Cryogenics

摘　　要：采用Fluent软件对微型模块化液化气微推进系统的拉瓦尔喷管进行了流体仿真,得到了喷管各个尺寸因素对有效比冲和推力的影响曲线关系,并给出了喷管的最终优化结果。喷管有五个尺寸因素:入口直径、喉部直径、出口直径、收缩段长度和扩张段长度。其中,喉部直径越大,推力越大,有效比冲越小;出口直径越大,推力和有效比冲越大;收缩段长度较小时,对有效比冲影响较大,对推力几乎无影响;入口直径和扩张段长度对推力和有效比冲的影响很小可忽略。The modular liquefied gas micro-propulsion system of Laval nozzle was simulated by using FLUENT software,and got each size of nozzle thrust and effective specific impulse,and gave the optimized results of nozzle.The nozzle has five sizes:inlet diameter,throat diameter,outlet diameter,contraction length and expansion length.Among them,the greater the throat diameter,the larger the thrust,the smaller the effective specific impulse;the greater the outlet diameter,the larger the thrust and effective specific impulse;when the contraction length is small,it affects the effective specific impulse,and almost has no effects on thrust;the effects of inlet diameter and expansion length are very small to be ignored.

关 键 词：液化气微推进系统 拉瓦尔喷管 流体仿真 有效比冲 尺寸优化 

分 类 号：V435[航空宇航科学与技术—航空宇航推进理论与工程]