【摘要】 为了进一步研究可调式射流泵的性能,通过对实验设计加工制作的2套喷针,收缩锥角分别为20(Ⅰ型)和55(Ⅱ型)及对应的2套喷嘴,收缩锥角分别为30(Ⅰ型)和64(Ⅱ型),在工作水压力分别稳定在0.5 MPa和1.2MPa下进行可调式射流泵的基本性能和汽蚀性能实验.从模型实验中可以看出,在额定工况附近,可调射流泵的效率略低于不可调射流泵.Ⅰ型可调射流泵的基本性能略优于Ⅱ型,但两者非常接近.可调射流泵的性能与相同面积比的不可调射流泵有很大不同,可调射流泵的设计计算中不能再照搬不可调射流泵的理论.根据实验结果,归纳总结出了可调射流泵的基本性能方程表达式.对同类水电站技术供水系统设计有参考价值.更多还原

【Abstract】 To further investigate the performance of adjustable jet pump,two sets of model spindles of which angles of contraction cone are 20 (I-type) and 55 (II-type) respectively,are manufactured.Two sets of model nozzles of which angles of contraction cone are 30(I-type) and 64(II-type) respectively,are also manufactured.The experiments of fundamental and cavitation performances are done when working pressure is stabilized at 0.5 MPa and 1.2 MPa.The model experiments indicate that the efficiency of the adjustable jet pump is slightly lower than fixed jet pump at near rating operation point.With the decrease of opening degree,both efficiencies are more and more close to each other.The fundamental performance of I-type adjustable jet pump is better than II-type,the cavitation performance of I-type adjustable jet pump is worse than II-type.Experiment data also indicate that the performance of adjustable jet pump is very different from fixed jet pump,so the theory of fixed jet pump is not able to be copied to adjustable jet pump.It is necessary to farther study the performance of the adjustable jet pump.Empirical expressions are put forward.This paper has reference value for analogous design of technical water supply of hydropower stations.更多还原