Adiabatic Homogeneous Model for Flow Around a Multiperforated Plate

An adiabatic homogeneous model to account for multiperforated liners in combustion chamber flow simulations is described. It is based on a suction and an injection model to reproduce the average effect of effusion cooling on both sides of the plate. The coupled suction/injection model has been specifically designed to be used in industrial full-scale computations of gas turbine combustion chambers, where effusion cooling is commonly used for controlling the temperature of the liners. Notably, it can be used with a coarse grid, the real perforated plate being replaced by a homogeneous boundary condition where the model is applied. The new modeled boundary condition conserves the inviscid part of the wall fluxes, which are shown to be the main contribution, as evidenced by the analysis of former wall-resolved simulations. Conserving the wall fluxes allows reproduction of the global structure of the flow and leads to reasonable comparisons with experimental data. Hence, the proposed new model provides a practical way to account for multiperforated plates with inclined perforations without resolving the flow in the perforations.

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