In BRY air-cooled centrifugal heat transfer oil pump design,generally need to give the design parameters:flow Q,head H,speed N,NPSHr NPSHr and efficiency.According to the above parameters,the structural scheme of the centrifugal tip can be initially determined and the specific rotational speed Ns of the impeller can be calculated.Then,some empirical data(formulas)are used to determine the main geometric dimensions of the impeller.
In BRY air-cooled centrifugal heat transfer oil pump and Francis pump impeller oil flow design,assuming that the flow inside the impeller is axisymmetric flow,the velocity at any point in the flow field can be decomposed into axial(including the axis of the impeller axis)Of the axial velocity component and the circumferential velocity component.The distribution of the axial velocity component is determined by the axial projection of the impeller runner and the boundary conditions at the inlet of the impeller.The distribution of the circumferential velocity is determined by the distribution of the axial velocity component and the blade placement angle.Therefore,the first step in the design of the impeller is to determine the axial velocity and circumferential velocity.BRY air cooled centrifugal heat pump impeller size to determine the following three methods:
