ディフューザベーン前縁の噴流による遠心ポンプにおけるディフューザ旋回失速抑制効果に関する実験的研究

抄録

The operation range of centrifugal pumps is severely limited by unsteady phenomena such as diffuser rotating stall (DRS) at non-design points, which has become a problem in the industrial world. In a previous study, an attempt was made to suppress DRS by slitting the diffuser vanes to expand the operating range of the pump, but it was found that there is a trade-off between the effect of DRS suppression and pump efficiency. In this study, holes were drilled near the front edge of the diffuser vane to onset the jet flow to develop a new method to suppress DRS with minimal loss of efficiency. The effect of increasing the number of holes drilled in a stepwise manner on DRS suppression was experimentally investigated. It was found that the DRS suppression effectiveness increased as the number of holes was increased.