Numerical Investigation of Effects of Compound Angle and Length to Diameter Ratio on Adiabatic Film Cooling Effectiveness

TL;DR

This study uses numerical simulations to analyze how compound injection angles and length-to-diameter ratios affect adiabatic film cooling effectiveness, revealing that effectiveness depends on these parameters.

Contribution

It introduces a modified hole design with compound angles and L/D ratios, providing new insights into optimizing film cooling performance through numerical analysis.

Findings

Effectiveness varies with L/D ratio and compound angle.

Optimal angles improve cooling efficiency.

Effectiveness trends depend on combined parameters.

Abstract

A modification has been done in the normal injection hole of 35 degree, by injecting the cold fluid at different angles(compound angle) in lateral direction, providing a significant change in the shape of holes which later we found in our numerical investigation giving good quality of effectiveness in cooling. Different L/D ratios are also studied for each compound angle. The numerical simulation is performed based on Reynolds Averaged Navier-Stokes(RANS) equations with k-epsilon turbulence model by using Fluent(Commercial Software). Adiabatic Film Cooling Effectiveness has been studied for compound angles of (0, 30, 45 and 60 degrees) and L/D ratios of (1, 2, 3 and 4) on a hole of 6mm diameter with blowing ratio 0.5. The findings are obtained from the results, concludes that the trend of laterally averaged adiabatic effectiveness is the function of L/D ratio and compound angle.