Abstract
Impingement cooling is commonly employed in gas turbines to control the turbine tip clearance. During the design phase, computational fluid dynamics (CFD) is an effective way of evaluating such systems but for most turbine case cooling (TCC) systems resolving the small scale and large number of cooling holes is impractical at the preliminary design phase. This paper presents an alternative approach for predicting aerodynamic performance of TCC systems using a “smart” porous media (PM) to replace regions of cooling holes. Numerically CFD defined correlations have been developed, which account for geometry and local flow field, to define the PM loss coefficient. These are coded as a user-defined function allowing the loss to vary, within the calculation, as a function of the predicted flow and hence produce a spatial variation of mass flow matching that of the cooling holes. The methodology has been tested on various geometrical configurations representative of current TCC systems and compared to full cooling hole models. The method was shown to achieve good overall agreement while significantly reducing both the mesh count and the computational time to a practical level.
Highlights
In modern aero‐engines, control of the over‐tip leakage flow in turbines is crucial in reducing secondary flow losses and improving specific fuel consumption
A porous media methodology has been developed for the CFD modelling of turbine case cooling (TCC) systems used in aero style gas turbines
The impingement cooling holes were replaced by porous media zones in the computational domain
Summary
In modern aero‐engines, control of the over‐tip leakage flow in turbines is crucial in reducing secondary flow losses and improving specific fuel consumption.
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