黏弹流体在变频调速系统中的水击数值模拟

Numerical Investigation on Water Hammer Process of Viscoelastic Fluid Variable Frequency Flow Regulation Systems

研究黏弹性流体变频流量控制水击产生机理的相关理论对于变频流量控制流体输送系统的设计和水击控制设计具有参考价值。基于Mini-Element法、罚函数法、Galerkin法、DEVSS-G/SUPG法等混合有限元稳态离散技术,建立求解黏弹性流体变频流量控制输送系统水击产生过程的全三维黏弹性理论模型的稳态有限元数值离散模型。通过建立的稳态有限元数值算法,系统模拟黏弹性流体流变性能参数对变频流量控制流体输送系统水击过程的影响规律。结果表明:变频流量控制流体输送系统水击强度随着黏弹性流体的松弛时间和密度的增加而增加,随着流体黏度的增加而减小。

It is very important to study the mechanism of water hammer for the design method and water hammer pressure control method of viscoelastic fluid variable frequency flow regulation transporting system. Based on the mixed finite element stable discrete techniques of Mini-Element method, penalty function method, Galerkin method and DEVSS-G/SUPG method etc.,the stable finite element numerical model was established for 3D water hammer process of viscoelastic fluid variable frequency flow regulation transporting system. The influencing rules of viscoelastic rheological parameters on the water hammer were modeled by the stable numerical algorithm established. The simulation results show that water hammer strength increase with increasing of viscoelastic fluid relaxation time and density, but decrease with increasing of viscoelastic fluid viscosity.