火箭推进2024，Vol.50Issue(2)：88-97,10.DOI:10.3969/j.issn.1672-9374.2024.02.009
双钟形喷管在分离工作阶段的吸气阻力分析
Analysis of the aspiration drag in dual-bell nozzles during separation operating mode
摘要
Abstract
The performance of dual-bell nozzles is affected by the aspiration drag generated in the recirculation zone during low-altitude operation.Dual-bell nozzles with different design parameters were studied by simulation to gain the aspiration drag at various flight altitudes.Results show that the aspiration drag does not always decrease with the increasing flight altitude as existing research reported.The aspiration drag of dual-bell nozzles with negative wall pressure gradient extension decreases with increasing flight altitude,while the aspiration drag of dual-bell nozzles with zero and positive wall pressure gradient extensions firstly decreases and then increases with the increase of flight altitude,and the inflection altitude appears at 2 km.These phenomena are caused by opposite varying trends for the axial size of the recirculation zone and the difference between the ambient pressure and the wall pressure in the recirculation zone during the ascent of flight altitude 0-8 km.Moreover,the aspiration drag can be reduced by increasing the length and area ratio of the base section and decreasing these parameters of nozzle extensions,the reduction in drag coefficient is about 1%-2%.关键词
双钟形喷管/吸气阻力/流动分离/马赫反射/规则反射Key words
dual-bell nozzles/aspiration drag/flow separation/mach reflection/regular reflection分类
航空航天引用本文复制引用
刘亚洲,曹晨,胡海峰,杨建文..双钟形喷管在分离工作阶段的吸气阻力分析[J].火箭推进,2024,50(2):88-97,10.基金项目
国家自然科学基金(52005385) （52005385）
