DEVELOPMENT OF A REDUCED ORDER MODEL FOR DOUBLE WALL LINER COOLING SCHEMES

Double wall cooling scheme combines the impingement and effusion cooling schemes and efficient way to deal with higher temperature values. However, its complex structure makes the simulations and experiments more expensive. The present study aims to develop a correlation-based one-dimensional low order model to predict wall temperature values for double wall structures before conducting numerical analysis and experiments. The effusion cooling is modeled by using single hole film cooling correlations, that includes effect of the lateral hole displacements, hole angle and blowing ratio, are combined with a superposition method to represent staggered hole arrays in the axial direction. On the other hand, the effect of impingement cooling is added as a source term. Several experimental data is used for validating the one-dimensional solver. In addition, conjugate heat transfer analysis is conducted for better understanding of the heat transfer mechanism, and comparing the computational time. One-dimensional model and conjugate heat transfer analysis are in a good agreement with experimental data for different double wall cooling configurations. Also, the low order model provides highly accurate results in a remarkably shorter time than the conjugate heat transfer analysis. The low order model proves itself as a promising tool that the industry could quickly adopt to evaluate innovative cooling geometries.