摘要
In the present paper,the vibration response difference of the upper stage nozzlewith higher expansion ratio between ground and altitude simulation hot-firing test is analyzed.lt indicates that the acceleration response of the nozzle under ground hot-firing test is muchhigher than that of the altitude condition.In order to find the essential reason,the experimentaland numerical simulation studies of the flow separation are developed by using the test enginenozzle.The experimental data show that the nozzle intemal flow occurred flow separation andthe divergence cone intemal wall pressure pulsation increased significantly downstream fromthe separation location.The numerical simulation and experimental results indicate that theincrease of internal wall pressure and turbulence pulsating pressure are the substantial reason ofvibration response increasing aggravatingly during the ground firing test.
基金
The authors would like to thank for the supports by National Basic Research Development Program of China(973-613184 Project)。
