摘要
为了研究某安装倾斜喷管发动机的运载火箭对新型发射台的冲击特性,基于三维可压缩多组分输运Navier-Stokes方程、Realizable k-ε两方程湍流模型、总变差不增(Total variation diminishing,TVD)离散格式,建立了火箭燃气射流模型并用其与实验结果进行对比,验证了计算模型的准度和精度。通过数值模拟,研究不同起飞高度、不同冲击方向下射流冲击发射平台的影响,并考虑火箭漂移现象。结果表明,两台发动机羽流汇合成一道,喷管倾角导致其无法竖直通过导流孔,随着起飞高度的增加,燃气流冲击区域逐渐移动到前置设备间上表面,形成较大的热、力载荷,且漂移现象会加快该过程。随着起飞高度进一步增加,作用到台面上的载荷逐渐峰值减小但冲击区域逐渐扩大。仿真结果可为新型发射平台热防护设计以及前置设备间钢架结构强度校核提供依据。
To investigate the impact characteristics of a launch vehicle equipped with inclined nozzle engines on a new type of launch platform,a rocket gas jet model is established based on the three-dimensional compressible multi-component transport Navier-Stokes equations,the Realizable k-ε two-equation turbulence model,and the total variation diminishing(TVD)discretization scheme.This model is then compared with experiments to validate the accuracy and precision.Through numerical simulations,the effects of jet impact on the launch platform under different takeoff heights and impact directions are studied,and the rocket drift phenomenon is considered.Results show that the plumes from the two engines merge into one,and the inclination angle of the nozzle leads it unable to pass vertically through the hole.As the takeoff height increases,the impact area of the gas flow gradually moves to the upper surface of the front equipment room,forming significant thermal and mechanical loads,and the drift phenomenon accelerates this process.As the takeoff height further increases,the peak load on the platform surface gradually decreases,but the impact area continues to expand.The simulation results can provide a basis for the thermal protection design of the new launch platform and the strength verification of the steel frame structure of the front equipment room.
作者
周昀廷
马长胜
马竟雯
乐贵高
ZHOU Yunting;MA Changsheng;MA Jingwen;LE Guigao(School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;Military Representative Bureau of Land Equipment in Nanjing,Nanjing 210094,China)
出处
《南京航空航天大学学报(自然科学版)》
北大核心
2025年第4期713-722,共10页
Journal of Nanjing University of Aeronautics & Astronautics (Natural Science Edition)
