摘要: |
液体火箭发动机液流试验系统常采用孔板等节流元件进行调节,节流孔板会导致管道系统流场突变、造成漩涡和回流,引起局部的压力脉动,导致管道出现振动和噪声,影响系统的安全运行。为此,以孔板载流管道为研究对象,采用ANSYS仿真分析方法,对孔板附近流场的压力速度分布特性进行了分析,对不同流速下孔板载流管道的压力脉动特性和流体诱导振动特性进行了探究,并提出了节流孔板的优化设计方案,减小了管道振动。仿真结果表明,孔板下游漩涡脱落产生水头损失;孔板出口压力脉动突变,产生水力扰动,脉动主频随流速增大而增大,通过频域分析可避开结构固有频率,避免产生共振;当流速增大时,孔板流体压力脉动增大,导致管道的流体诱导振动增强;多级孔板优化方案可以有效减小压力脉动和管道振动。 |
关键词: 液流试验系统;节流孔板;压力脉动;流体诱导振动;多级孔板 |
基金项目: |
|
Simulation Research on Flow-Induced Vibration of Pipe Conveying Fluid with Orifice Plate in Liquid Rocket Engine Fluid Test System |
Shi Ruijie Song Ge Fu Hao Ma Hangyuan Zhang Dong
|
Beijing Aerospace Propulsion Institute, Beijing 100076
|
Abstract: |
The liquid rocket engine fluid test system is often regulated by throttling elements such as orifice plates, the throttling orifice will cause sudden change in the flow field of the pipeline system, cause vortex and backflow, cause partial pressure fluctuation, cause vibration and noise in the pipeline, and affect the safe operation of the system. Taking the pipe conveying fluid with orifice plate as the research object, the ANSYS simulation analysis method is used to analyze the pressure and velocity distribution characteristics of the flow field near the orifice plate. And the pressure fluctuation characteristics and flow-induced vibration characteristics under different flow rates are analyzed. The optimal design scheme of the orifice plate was proposed to reduce the vibration of the pipeline. The simulation results show that the vortex shedding downstream of the orifice plate causes head loss; the pressure at the outlet of the orifice plate fluctuates abruptly, resulting in hydraulic disturbance, and pressure fluctuation increases with the increase of the flow velocity. Through the main frequency of fluctuation analysis, the natural frequency of the structure can be avoided, thereby avoiding resonance. When the flow rate increases, the fluid pressure fluctuation of the orifice plate increases, which leads to the enhancement of the fluid-induced vibration of the pipeline; the multi-stage orifice plate optimization scheme can effectively reduce the pressure fluctuation and the pipeline vibration. |
Key words: fluid test system;orifice plates;pressure fluctuation;fluid-induced vibration;multi-stage orifice plate |