计算力学学报2016，Vol.33Issue(6)：918-923,6.DOI:10.7511/jslx201606018
高焓膨胀管中压缩管最佳长度设计分析
Design and analysis of the optimal length for compression tube in the high enthalpy expansion tube
摘要
Abstract
T he high enthalpy expansion tube facility being constructed in China Aerodynamics Research and Development Center will be driven by a free piston compression tube .The length of the compression tube needs to be optimized in order to make the effective test time as long as possible .T he influences of experimental parameters and various driver gases on the constant‐pressure time of compression tube were analyzed by numerically solving a set of piston motion model differential equations under the condi‐tions of a single and multi‐species driver gases .The numerical solution combined with the theory of bridge curve is used to construct a curve surface composed of local maximum values of constant‐pressure time in parameter space .The aforementioned curve surfaces from the cases including four kinds of driver gas (100% H2 ,85% H2 +15% N2 ,100% He ,85% He+15% Ar) and three set of volumetric compression ratios (λ= 60 ,100 ,140) showed that the altitude of bridge curve for constant‐pressure time increases with the ratio of effective length (namely ,the initial distance from front face of the piston to the diaphragm located at the terminal of compression tube ) of a compression tube to its internal diameter L/D .The optimal length of compression tube was obtained which satisfies the longest constant‐pressure time requirement .关键词
高焓膨胀管/活塞运动/压缩管/定压驱动时间/脊线Key words
high enthalpy expansion tube/piston motion/compression tube/constant-pressure time/bridge curve分类
航空航天引用本文复制引用
李海燕,吕治国,罗万清,常雨..高焓膨胀管中压缩管最佳长度设计分析[J].计算力学学报,2016,33(6):918-923,6.基金项目
国防基础科研基金（51313030104）资助项目． （）
