In order to reduce dependence on empirical parameters during inducer design, in this paper different outlet circulation distributions are introduced to regulate blade angle across blade height. Three inducers with different outlet circulation distributions were designed, and their influence on the inducer performance was studied by numerical calculation. Hydraulic design results show that the circulation distribution can be used as a control variable in inducer design and affects both wrap angle and length of inducer blades directly. The numerical simulation results illustrate that decreasing the circulation near the hub and increasing the circulation near the blade tip can prevent inducer blade angle at the hub from being twisted seriously and improve blade hydraulic efficiency. At the same flow rate, the inducer with quadratic increasing circulation distribution has the highest head which can enhance the centrifugal impellers capability of anticavitation. The comprehensive performance of the inducer with quadratic increasing circulation distribution is the best, while the performance of that with linear increasing circulation distribution is the poorest. The flow field of the inducer with constant circulation distribution is the most stable, but a strong vortex is present near the inlet tip. Accordingly, it is more proper to select the quadratic increasing circulation distribution in inducer hydraulic design.
YANG Jing-Jiang,LIU Cheng-Qiang,CHEN Hui-Long et al. Influence of outlet circulation distribution on hydraulic characteristics of pump inducer[J]. Journal of Drainage and Irrigation Machinery Engin, 2019, 37(1): 18-24.