高速离心泵全流场非定常流动激励转子振动特性研究

高速离心泵是液体火箭发动机和炼化装置的关键流体输送设备。高速离心泵内部非定常流动激励转子振动是限制大推力液体火箭发动机和大型炼化装置可靠性提升的瓶颈。为准确预测高速离心泵非定常流动激励转子振动特性，涉及两个关键科学问题：一是高转速下泵内全流场非定常弱可压流体的压力脉动规律；二是基于全流场非定常流体激励作用的转子系统动力学模型构建。.本项目拟通过对高速离心泵全流场非定常流动激励转子振动特性关键技术基础研究，建立带螺旋度约束动态亚格子模式泵内弱可压流体数值计算方法，揭示压力脉动机理和传播规律；基于全流场分析计算主流场和间隙流场流体激励力，建立基于全流场非定常流体激励作用的高速离心泵转子振动响应动力学模型；分析高速离心泵转子的振动规律，建立非定常流动诱发的振动和压力脉动之间的关联，掌握高速离心泵流体激振机理及其动力学规律，为高性能高速离心泵的设计制造及其可靠运行提供理论支持和技术支撑。

High speed centrifugal pump is the key equipment of liquid rocket engine and refining equipment. The rotor vibration excited by unsteady flow in high-speed centrifugal pump is the bottleneck to limit the reliability improvement of high thrust liquid rocket engine and large refining equipment. In order to accurately predict the rotor vibration characteristics excited by unsteady flow in high-speed centrifugal pump, two key scientific issues are involved: first, the law of the pressure fluctuation of the unsteady weak compressible fluid in the whole flow field of the pump at high speed; second, the construction of the dynamic model of the rotor system based on the unsteady excitation force of the whole flow field..In this project, through the basic research on the key technology of rotor vibration characteristics excited by unsteady flow in the whole flow field of high-speed centrifugal pump, the numerical calculation method of weakly compressible fluid in the pump with dynamic sublattice mode with helicity constraint is established to reveal the law and mechanism of pressure fluctuation. Based on the analysis of the whole flow field, the excitation force of main flow and clearance fluid is calculated, and the dynamic model of rotor vibration response of high-speed centrifugal pump is investigated based on the unsteady excitation force of the whole flow field. The vibration law of the rotor of the high speed centrifugal pump is analyzed and the relationship between the vibration and the pressure pulsation induced by the unsteady flow is formed. It is to master the fluid exciting mechanism and the dynamic law of the high speed centrifugal pump and provide theoretical support and technical support for the design, manufacture and reliable operation of the high performance high speed centrifugal pump.