CAJ | 학술논문

为研究叶片包角对离心泵流动诱导振动噪声的影响,以一台单级单吸离心泵为研究对象,保持泵体和叶轮其他几何参数不变,将叶片包角从115°分别改为110°、120°和125°.基于离心泵流动诱导振动噪声的试验测试系统,在离心泵闭式试验台上测量了不同叶片包角模型泵在不同流量下的振动和噪声信号并对其进行了处理和分析.试验结果表明:模型泵内部流动诱导的振动对泵体的影响最大,包角为125°时模型泵的振动强度相对较弱;随着叶片包角的增加,泵进口法兰测点 a1和泵出口法兰测点 a2处振动强度大致呈先增加后降低的趋势,泵体测点 a3和泵脚测点 a4处的振动强度无明显变化规律;在不同流量工况下,随着叶片包角的增加,模型泵噪声信号的轴频峰值呈先增加后减小的变化趋势,而叶频能量峰值变化较为复杂.该研究可为低振动低噪声离心泵的水力优化设计提供参考.
위연구협편포각대리심빙류동유도진동조성적영향,이일태단급단흡리심빙위연구대상,보지빙체화협륜기타궤하삼수불변,장협편포각종115°분별개위110°、120°화125°.기우리심빙류동유도진동조성적시험측시계통,재리심빙폐식시험태상측량료불동협편포각모형빙재불동류량하적진동화조성신호병대기진행료처리화분석.시험결과표명:모형빙내부류동유도적진동대빙체적영향최대,포각위125°시모형빙적진동강도상대교약;수착협편포각적증가,빙진구법란측점 a1화빙출구법란측점 a2처진동강도대치정선증가후강저적추세,빙체측점 a3화빙각측점 a4처적진동강도무명현변화규률;재불동류량공황하,수착협편포각적증가,모형빙조성신호적축빈봉치정선증가후감소적변화추세,이협빈능량봉치변화교위복잡.해연구가위저진동저조성리심빙적수력우화설계제공삼고.
In order to better understand the effects of vane wrap angle on flow induced vibration and noise of centrifugal pumps, a single grade end suction centrifugal pump is chosen as research object. The vane wrap angle was varied from 115°to 110°, 120°and 125°, while the volute and other geometric parameters were kept constant. The vibration and noise signal of the model pump were acquired via PXI-4472B dynamic data acquisition system developed by NI Company in United States and measured respectively by the 4 acceleration transducers MA352A60 made in the PBC Company in USA with a range of 5-70 kHz, and one hydrophone with a range of 50-70 kHz and a received sound pressure sensitivity of -204 dB. The hydrophone measure point was located in pump outlet pipe and the 4 acceleration transducers were placed on the suction flange a1, discharge flange a2, the pump casing a3 and the pump foot a4 respectively. Based on the pump testing system and the virtual instrument data acquisition system, the pump flow-induced vibration and noise testing system was established, which realized the synchronous collection of the pump characteristics and the vibration and noise signal. In addition, the system improved testing accuracy. On the centrifugal pump closed experimental rig, the performance characteristics (flow-head curves and flow-efficiency curves), the flow-induced vibration and noise signals of model pump with different vane wrap angle in the full flow range were measured and analyzed. Experimental results show that there was an optimal value of vane wrap angle for pump to obtain maximum efficiency under design condition, because the unsteady flow (take-off flow and vortex) decreased with the increase of vane wrap angle, but the blade length growth, friction loss increased. 115°was found as the optimal vane wrap angle for the model pump in this investigation. The vibration intensity of model pump with different vane wrap angle at four measurement points was nearly unchanged or with a little fluctuation under small flow condition and vibration intensity increased significantly under large flow condition. The influence of flow-induced vibration on pump casing a3 was larger, the low vibration intensity was observed in the pump with 125°vane wrap angle. With the increase of vane wrap angle, the variation tendency of vibration intensity for suction flange a1 and discharge flange a2 measure points are augment at first and then decrease, for pump casing a3 and pump foot a4 measure points were complicated, but they achieved the minimum when vane wrap angle was 125°; Noise signals concentrate in the range of 0-2500 Hz, the shaft frequency and the blade passing frequency were the main reason of discrete noise in model pump. Under different conditions, the shaft frequency peak of noise signal increased at first and then decreased with the increase of vane wrap angle, but the peak of blade passing frequency varied intricately. The research results are helpful for hydraulic optimization design of low vibration and low noise centrifugal pump.