Changwon National University – Numerical and Experimental Investigations of Film Cooling Configurations With and Without Compound Angles, Including Application to Double Wall Cooling Environments

This research activity, involving Dr. Ligrani, is in collaboration with Professor Heesung Park, and his graduate students, of the Graduate School of Mechanical Engineering of Changwon National University, located in South Korea. Within the first part of the collaboration, of interest are numerically predicted distributions of film cooling effectiveness for single cylinder film holes and for single 15° forward diffused film cooling holes, with compound angles ranging from 0° to 180°. Hole inclination angle, with respect to the test surface, is 35° for all arrangements considered, and blowing ratios of 0.60 and 1.25 are used.  Thermal performance is characterized using spatially-resolved distributions of surface adiabatic film cooling effectiveness. Also considered are local flow secondary flow vector distributions, local flow streamwise vorticity distributions, and local variations of film cooling effectiveness within the flow field. In the second part of the collaboration, full coverage effusion arrangements are considered, as employed within double wall arrangements. Within the flow field, predicted are spatially-resolved distributions of local secondary flow vectors, local streamwise vorticity, local stagnation pressure, local streamwise velocity, and local film cooling effectiveness. Thermal protection is further characterized using surface distributions of heat transfer coefficient and  adiabatic film cooling effectiveness.

REFERENCES

¹ Numerical Investigation of Adiabatic Film Cooling Effectiveness Through Compound Angle Variation (S. Tamang, H. Kwon, J. Choi, P. M. Ligrani, J.-H. Lee, Y.-G. Jung, and H. Park), submitted to be considered for publication, 2020.