Study of the effusion wall film heat transfer coefficients of impingement/effusion double wall cooling method

This paper presented the experimental study of effusion wall film heat transfer coefficients for impingement/effusion double wall cooling method, which was one of the advanced cooling methods of combustor or liner in aeroengine. The investigation focused on the factors affecting the heat transfer coefficients, which were main flow Reynolds number, blowing ratio and configurations. The heat transfer coefficients were studied using the comparing method, and the basic heat transfer coefficients were compared with classical heat transfer result, showing that the difference was within ±7%. The experimental results show that the main flow Reynolds number has no effect on the effusion wall film heat transfer coefficient, while the blowing ratio and configurations are the main factors. The more the rows of cooling film, the higher the heat transfer coefficient along the flowing direction. The experimental results were correlated, and the correlation could be used in the heat transfer design and validation of cooling schemes.