固体火箭技术2024，Vol.47Issue(6)：867-875,9.DOI:10.7673/j.issn.1006-2793.2024.06.014
双钟形喷管流动振荡特性的实验研究
Experimental study on flow oscillation characteristics of dual-bell nozzles
摘要
Abstract
To understand the phenomenon of flow oscillation in the dual-bell nozzle,a wind tunnel test was conducted to study the flow oscillation characteristics of dual-bell nozzles with different extension pressure distributions.Flow field oscillation character-istics under different flow states were obtained.The results show that,there are low-frequency fluctuation about 180 Hz caused by the acoustic resonance in the recirculation zone and the unsteady pulsation of shock wave in the flow field of dual-bell nozzles under both the separation state and the full-flow state.However,when the separation gradually increase,the shock system pulsation is sup-pressed and the oscillation phenomenon is significantly weakened.Specifically,when the separation shock suddenly changes from mo-tion to relatively static after the fast mode re-transition,the flow produces an impact effect,and the oscillation amplitude is amplified about 5 times,but then rapidly attenuated.In engineering practice,the structural design of dual-bell nozzles should ensure the char-acteristic frequency of the nozzle structure away from the characteristic frequency of flow oscillation to avoid resonance.Meanwhile,the impact load after fast mode transition should also be taken into consideration in the design of dual-bell nozzle structures.关键词
双钟形喷管/流动分离/低频振荡/激波脉动Key words
dual-bell nozzle/flow separation/low frequency oscillation/shock wave pulsation分类
航空航天引用本文复制引用
刘亚洲,王壮,胡海峰,杨建文..双钟形喷管流动振荡特性的实验研究[J].固体火箭技术,2024,47(6):867-875,9.基金项目
国家自然科学基金(52005385). （52005385）
