摘要
采用流固耦合数值模拟技术研究了减压器工作过程的动态特性。流体控制方程为三维基于动态网格描述的Eu ler方程,采用非结构动网格有限体积格式求解;固体结构的运动方程由拉格朗日方程导出,采用纽马克方法求解。提出了可变边条零厚度虚拟挡板技术模拟了活门由闭到开的瞬态过程。计算得到了上游不同开启压力以及不同开启持续时间减压器弹性元件的动态响应特性,结果表明,虚拟挡板技术模拟物体间由零距离开始分离的实际过程是成功的,且对最小网格尺度没有限制;将减压器上游高压的开启持续时间延长能够避免阀芯开度的振动。
The dynamic properties of a pressure regulation valve are studied numerically using a method of fluid and solid coupling method.The governing equations of fluid dynamics are 3D unsteady Euler equations and are solved by finite volume scheme in dynamic unstructured grids.The motion of solid structure is governed by a 1D dynamic equation derived from Lagrangian equation.Newmark method is used to solve the governing equation for solid structure.A new zero thickness virtual baffle face strategy is implemented to simulate the contact-detaching process while the main stopper moves from shut state to open state.The dynamic responses of the elastic sensitive components corresponding to different upstream pressure and different pressurizing speed are obtained from the calculation results,which indicate that the virtual baffle face strategy is successful for simulating objects separating from contact and has no restriction on minimum grid size.The calculation results show that the oscillation of moving assembly can be eliminated by extending the upstream pressurizing duration.
出处
《固体火箭技术》
EI
CAS
CSCD
北大核心
2010年第6期713-718,共6页
Journal of Solid Rocket Technology
关键词
流固耦合
非结构动网格
EULER方程
减压器
接触分离
fluid and solid coupling
dynamic unstructured grid
Euler equations
pressure reducing valve
contact-detach
