CAJ | 학술논문

流体激励力是离心泵主要振源之一。通过对离心泵流场进行优化，可有效降低泵组流体激励力，减小离心泵振动。以多级离心泵的减振降噪为研究目的，运用CFD仿真技术从切割叶轮及改变蜗壳形状两个方面对流场进行优化。通过对比优化前后压力脉动以及流场激励力变化，说明优化情况。最后考虑加工工艺要求，选择切割叶轮的优化方法，并通过机脚振动响应的变化间接验证改善效果。结果表明：切割叶轮与改变隔舌形状对离心泵叶频及其倍频下的压力脉动与流体激励力都有减小，切割叶轮后机脚响应降低了4 dB。
류체격려력시리심빙주요진원지일。통과대리심빙류장진행우화，가유효강저빙조류체격려력，감소리심빙진동。이다급리심빙적감진강조위연구목적，운용CFD방진기술종절할협륜급개변와각형상량개방면대류장진행우화。통과대비우화전후압력맥동이급류장격려력변화，설명우화정황。최후고필가공공예요구，선택절할협륜적우화방법，병통과궤각진동향응적변화간접험증개선효과。결과표명：절할협륜여개변격설형상대리심빙협빈급기배빈하적압력맥동여류체격려력도유감소，절할협륜후궤각향응강저료4 dB。
Fluid exciting force is one of the important vibration sources of centrifugal pump which transmits outward through the pump shell and bearings. So, flow field optimization can effectively reduce the fluid exciting forces and vibration sources to improve the centrifugal pump’s vibration characteristic. In this paper, reduction of vibration and noise of a multi-stage centrifugal pump is studied. To begin with, CFD simulation technology is applied to optimize the flow field of the pump in the two aspects of cutting impeller and changing the shape of the volute. Then, the pressure pulsations and flow field excitation forces before and after the optimization are compared and analyzed. Afterwards, the method of cutting impeller is selected considering the requirements of processing technology. Finally the effectiveness is indirectly verified by analyzing the change of vibration response of the pump’s seats. The results show that cutting impeller and changing the tongue shape can reduce the pressure pulsation and fluid exciting force of the pump under blades’frequencies and octave frequencies, and the rear-seat vibration response after the cutting is reduced by 4 dB.