A non-overload centrifugal pump has been invented to solve the long-existingoverload problem of low specific speed centrifugal pumps when operating at greater flow andlower head than normal. The performance characteri...A non-overload centrifugal pump has been invented to solve the long-existingoverload problem of low specific speed centrifugal pumps when operating at greater flow andlower head than normal. The performance characteristics of non-overload centrifugal pumpsand the ordinary ones are introduced, and the test results are given here. By I. Khalil's numencalmethod, in hub-shroud plane using potential flow calculation to determine flow surface positionand in blade-blade plane using revised k turbulence model, the inner flow of non-overloadcentnfugal pumps and the ordinary ones are respectively calculated. The numerical simulationshows that the inner flow situates are completely different under the two cases. And there existsremarkable inner flow characteristics of non-overload centrifugal impellers but with neither flowseparation nor apparent wake flow, therefore, the lower efficiency attributes to the larger hydrau-lic friction loss due to larger blade wrapping angle.展开更多
文摘A non-overload centrifugal pump has been invented to solve the long-existingoverload problem of low specific speed centrifugal pumps when operating at greater flow andlower head than normal. The performance characteristics of non-overload centrifugal pumpsand the ordinary ones are introduced, and the test results are given here. By I. Khalil's numencalmethod, in hub-shroud plane using potential flow calculation to determine flow surface positionand in blade-blade plane using revised k turbulence model, the inner flow of non-overloadcentnfugal pumps and the ordinary ones are respectively calculated. The numerical simulationshows that the inner flow situates are completely different under the two cases. And there existsremarkable inner flow characteristics of non-overload centrifugal impellers but with neither flowseparation nor apparent wake flow, therefore, the lower efficiency attributes to the larger hydrau-lic friction loss due to larger blade wrapping angle.
