A Finite Element Based Wet Mode Analysis Method for Turbine Pump Immersion Fluid

Abstract

The present invention provides a finite element-based wet modal analysis method for turbopump filling liquid, using ANSYS finite element software, through the APDL language command flow and WORKBENCH modal analysis module to separately analyze the turbopump shell filling and centrifugal wheel structure Wet modal analysis is carried out under the state of immersion to analyze the influence of liquid on the natural frequency and mode shape of the structure. At the same time, considering the liquid oxygen state of the turbopump structure under engineering conditions, the influence of the immersion medium on the modal characteristics of the turbopump structure is analyzed. The effect provides an important dynamic basis for preventing the resonance of the structure. The present invention has certain versatility for the calculation of the natural frequency of the structure filled with immersion liquid, and can change the medium of the immersion liquid to obtain more accurate natural frequency and mode shape of the structure in the working state, in order to prevent structural resonance damage, vibration fatigue and evaluate structural Dynamic characteristics and optimized structure design provide a certain basis.

Description

technical field [0001] The invention relates to the field of modal analysis, in particular to a modal analysis method. Background technique [0002] Among the various components of the liquid rocket engine, the turbo pump is a component with high failure rate, which is closely related to the special structure, working mode and working environment of the turbo pump. As a key component of the engine system, the turbo pump's reliability plays a vital role in the stable operation of the entire engine system. Due to the current development trend of high speed and light weight, the problem of strong vibration of turbo pump is more prominent. The vibration of the turbo pump not only affects the working stability of the turbo pump but also affects the fatigue life of the turbo pump. Therefore, it is necessary to understand the natural frequency and mode shape of the structure, in order to prevent structural resonance damage, vibration fatigue and evaluate the dynamic characteristic...

AI Technical Summary

Problems solved by technology

[0004] At present, the finite element simulation of the modal analysis of the turbopump system is limited to the dry mode, but in fact, in the working process, the liquid has a great influence on the mode of the turbopump casing and the centrifugal wheel structure. It is also difficult to perform modal analysis under the state of filling liquid oxygen in the modal analysis test.

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