Numerical Modeling of Flow and Heat Transfer from an Array of Jets Impinging onto a Concave Surface under Stationary and Rotating Conditions

The paper reports computations of the flow and heattransfer from an array of five round jets impinging onto a concave semi-circular surface, under both stationary and rotating conditions. The geometry is designed to reproduce important flow features found in internal turbine blade cooling applications. Linear and non-linear eddy-viscosity models are applied, with wall-functions to cover the near-wall layer, and are shown to capture many of the overall flow characteristics under stationary conditions, although greater discrepancies are found in rotating cases. The standard, log-law based, form of wall-function is found to be inadequate in predicting the heat-transfer, and a more advanced form developed at Manchester (the AWF) is also tested, and shown to lead to better heat transfer results.