MEASUREMENTS OF LINER COOLING EFFECTIVENESS WITHIN A FULL-SCALE DOUBLE-ANNULAR RAM-INDUCTION COMBUSTOR

摘要

Combustor liner temperatures were measured on a full-scale combustor to evaluate the effective¬ness of various liner cooling designs. The experimental results indicate that considerable re¬duction of cooling airflow rate is possible by optimum utilization of available convective cooling. The liner total cooling effectiveness was not significantly dependent on inlet-air temperature and was independent of combustor temperature rise. The experimental data from various liner con¬figurations compared quite well with the results of an analytical heat-transfer model only if a turbulent mixing coefficient CM of 2 to 4 percent was chosen. These values of CM were much lower than the measured value of combustor turbulence intensity, contrary to the model's assumption that they are numerically equal.