论文部分内容阅读
空化所产生的噪声可以有效地指出泵中空化的性质及其程度。苏格兰东吉布利得国立工程实验室的研究表明,要阻止空化生长,必须使进口能量值大大超过水头或效率被影响时的数值。这样就确立了高频噪声(其标准为40千赫)与泵净吸入真空能(NPSE)之间的关系,从而清晰而可靠地指出了 NPSE,在此 NPSE 下泵内空化初生。然而空化噪声数据只有在实验室进行广泛地空化试验时才能得到。利用从噪声对 NPSE 的关系曲线数据,通过三个几何相似的模型泵的试验获得了经验对比关系。根据简单几何参数与流体参数,就可以单点测定流体噪声水平确定泵中空化是否存在。
The noise generated by cavitation can effectively indicate the nature and extent of cavitation in the pump. Studies at the National Engineering Laboratory in East Gibblich, Scotland, have shown that to prevent cavitation growth, the value of the imported energy must be significantly exceeded when the head or efficiency is affected. This established the relationship between high-frequency noise (at 40 kHz) and the net pump-in vacuum energy (NPSE), clearly and reliably indicating NPSE, where the pump was cavitated at birth. However, cavitation noise data can only be obtained when extensive cavitation tests are conducted in the laboratory. Empirical correlations were obtained from experiments with three geometrically similar model pumps using data from noise versus NPSE curves. Based on simple geometry parameters and fluid parameters, the fluid noise level can be measured single point to determine if pump cavitation exists.