论文部分内容阅读
导叶式混流泵叶片和导叶之间的动静干涉引起的压力脉动是诱发振动、噪声的主要来源之一。本文采用实验测试技术对泵在各个工况下的压力脉动、振动和噪声进行了测试分析。结果表明叶片通过频率是低频压力脉动和振动噪声的主频,且该频率下的压力脉动幅值对流量的变化很敏感,这是由叶轮和导叶之间的动静干涉引起的;而低频的振动和噪声变化规律与压力脉动变化规律基本一致;在叶轮二倍频和叶轮三倍频处振动噪声也出现明显的峰值,这可能是由叶轮叶片和壳体振动引起的。模型泵在额定流量工况时,由压力脉动诱发的振动和噪声较小,随着流量的减小,振动和噪声明显增大.当模型泵运行于55%额定流量点时,叶轮和导叶内出现了不稳定流动现象,诱发了强烈的机体振动和进水管路的噪声辐射。
The pressure pulsation caused by the static and dynamic interference between the vane guide vane and the guide vane is one of the main sources of vibration and noise. In this paper, the experimental test technology to pump pressure pulsations in various conditions, vibration and noise were tested and analyzed. The results show that the blade passing frequency is the dominant frequency of low-frequency pressure pulsation and vibration noise, and the pressure pulsation amplitude at this frequency is sensitive to the change of flow rate, which is caused by the static and dynamic interference between the impeller and the guide vane. The regularity of vibration and noise variation is basically the same as the variation of pressure pulsation. The vibration noise appears obviously at the double frequency of impeller and the third harmonic of impeller, which may be caused by the vibration of impeller and shell. When the model pump operates at rated flow conditions, the vibration and noise induced by pressure pulsation are small, and the vibration and noise increase obviously as the flow rate decreases.When the model pump is operating at 55% of rated flow point, the impeller and guide vane There have been instable flow phenomenon, induced a strong body vibration and water inlet noise radiation.