Measurements of Liner Cooling Effectiveness Within a Full-scale Double-annular Ram-induction Combustor

Résumé du livre

Combustor liner temperatures were measured on a full-scale combustor to evaluate the effectiveness of various liner cooling designs. The experimental results indicate that considerable reduction 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 configurations compared quite well with the results of an analytical heat-transfer model only if a turbulent mixing coefficient C sub M of 2 to 4 percent was chosen. These values of C sub M were much lower than the measured value of combustor turbulence intensity, contrary to the model's assumption that they are numerically equal.