噪声与振动控制
譟聲與振動控製
조성여진동공제
NOISE AND VIBRATION CONTROL
2014年
4期
134-137,152
,共5页
振动与波%运行工况%轴流泵%压力脉动
振動與波%運行工況%軸流泵%壓力脈動
진동여파%운행공황%축류빙%압력맥동
vibration and wave%working conditions%axial flow pump%pressure pulsation
泵内非定常压力脉动会引发泵体的结构振动，运行工况的变化会改变泵内流场的流动状态，从而对泵的振动特性产生影响。通过流体力学计算软件FLUENT对某台立式轴流泵内流场进行仿真计算，分别改变泵运行速度和流量两项参数，得出转速改变后，叶轮受到的力会偏离了相似理论的计算值；工作在小流量时，泵内压力脉动与叶轮受力均大于大流量工况，且叶轮区域出现流动分离现象，不利于振动噪声的控制。
泵內非定常壓力脈動會引髮泵體的結構振動，運行工況的變化會改變泵內流場的流動狀態，從而對泵的振動特性產生影響。通過流體力學計算軟件FLUENT對某檯立式軸流泵內流場進行倣真計算，分彆改變泵運行速度和流量兩項參數，得齣轉速改變後，葉輪受到的力會偏離瞭相似理論的計算值；工作在小流量時，泵內壓力脈動與葉輪受力均大于大流量工況，且葉輪區域齣現流動分離現象，不利于振動譟聲的控製。
빙내비정상압력맥동회인발빙체적결구진동，운행공황적변화회개변빙내류장적류동상태，종이대빙적진동특성산생영향。통과류체역학계산연건FLUENT대모태입식축류빙내류장진행방진계산，분별개변빙운행속도화류량량항삼수，득출전속개변후，협륜수도적력회편리료상사이론적계산치；공작재소류량시，빙내압력맥동여협륜수력균대우대류량공황，차협륜구역출현류동분리현상，불리우진동조성적공제。
Abastract : Structural vibration of a pump is partly caused by pressure pulsation of unsteady flow in the pump, the change of flow field within the pump is caused by the change of working conditions, and the vibration characteristics of the pump will be affected. In this paper, the unsteady flow field of an axial flow pump is simulated by means of FLUENT software with the steady flow as the initial field. The results of excitation force of flow on the pump and the impeller is calculated and analyzed under different working conditions. The results show that pressure pulsation on the blade deviates from the calculation data based on the similarity theory when rotating rate changes. With the flow rate decreasing, the pressure pulsation will increase, and separate flow will occur in the impeller area.
