In the custom pump business, on-site capabilities are required to develop and design pumps more promptly while responding to the diversity of the market. According to the above mentioned, this paper presented a mass customization concept for the pump hydraulic design method by combining 3-dimensional inverse design, numerical simulation, surrogate model, and multi-objective optimization. This method has been tested to design the vertical shaft pump for the case study. Numerical simulation and experimental tests of total 25 optimal design cases have been carried out to verify the prediction accuracy of the surrogate model. The performance characteristics predicted by the surrogate model showed good agreement with the experimental results and one of the optimal design cases under the severe conditions shows that the maximum shaft power ratio was significantly reduced from the conventional design. Additionally, this method could rapidly generate 3-dimensional hydraulic pump geometry and performance curves in tens of minutes to meet the multi-purpose of the strict customer requirements, hence demonstrating a pump selection system under the pump specification can be used for the actual operation in the near future.

Centrifugal compressor, which is the main component of turbocharger, is known to suffer the instability phenomena such as surge at low flow rate conditions. The nozzle injection system is an effective method to suppress the instability phenomena. In the system, a part of the air compressed by the compressor is bled from the scroll outlet and injected into the impeller inlet by the nozzle installed on the inner wall of suction pipe. The conventional type of injection nozzle is composed of the circular pipe which may locally obstacle the main flow in the suction pipe. In this study, the wall jet type of injection nozzle whose discharge port was located on the inner wall surface of suction pipe was investigated to reveal its effectiveness on the surge suppression. The present results indicate the importance of the injection to the tip of leading edge and the axial momentum of jet.