Numerical simulation of effusion holes on the longitudinal ripple heat shield

The numerical simulation was used to study the effusion holes on the longitudinal wavy liner in the combustor.The investigation focused on the parameters affecting cooling effectiveness,including: opening ratio,height of ripple board,diameter of holes and height of cooling passage.Given the same total flow effusion from holes,the results show that the heat shield gets a higher average cooling effectiveness when the opening ratio is 3% compared with 6%;cooling effectiveness is sensitive to the height of ripple board,the heat shield gets the highest cooling effectiveness when the dimensionless height of ripple board is 1% compared with 2% and 3.33%;but there is a little influence on the cooling effectiveness of the liner with the change of the diameter of holes and the height of cooling passage.