Effect of inaccurate source term loading on simulation ,precision for source term model

Numerical simulation of the real model and the source term model was carried out for a multi-perforated film cooling plate. On the basis of high-precision experimental comparison, the effect of inaccurate source term loading on the simulation results was explored, and the factors such as loading methods, discharge coefficient, and mesh parameters were analyzed. Results showed that the source term model could be used for numerical calculation of film cooling structure instead of establishing real holes with film hole. The source term loading method of accurate mesh positioning could achieve high precision under the coarse and fine meshes, while the point loading method was more sensitive to the grid. The mass flow rate calculation error caused by the inaccuracy of discharge coefficient empirical formulas would affect the calculation precision of the source term model, which was more pronounced at low blow ratios. The mesh density at the entrance and exit of the film hole should be not less than 4/mm2, and the height of first prism layer should be consistent with the turbulence model to ensure high simulation precision.