COMPUTATION OF 3-DIMENSIONAL VISCOUS-FLOW IN HIGH REYNOLDS-NUMBER PUMP GUIDE VANE

A three-dimensional Navier-Stokes solver which utilizes a pressure bas ed method is used to compute the incompressible flow field through the inlet guide vane (IGV) of a high Reynolds number pump. The solver has precise control of numerical dissipation through the second and fourt h order artificial dissipation terms added to the momentum equations. A low-Reynolds-number form of two-equation turbulence model is used to account for the turbulence effects. Predicted blade surface static pr essure distributions are in goad agreement with the measurement. The t angential and radial components of the IGV wake velocity, as well as t he IGV secondary flow, are predicted well. However, the predicted maxi mum defect in wake is larger than the measured data. Possible causes f or this discrepancy are discussed. The defect in velocity in wakes at midspan is found to decay faster than the perturbation in velocity due to the secondary flow and wake in the tip region.