CFD SIMULATION OF JET PULSATION EFFECTS ON FILM COOLING OF FLAT PLATES

摘要

In this paper fourteen different CFD cases for CFH (cylindrical film hole) and LDIFF (film hole with laterally diffused exit) geometries were conducted to study the film cooling of flat plates. Those cases included different blowing ratios: 0.5, 1.25 and 1.5 and both steady flow and pulsed jets. In the jet pulsation cases the Duty Cycle was taken 50% and the Strouhal number ranged from 0.0119 to 1.0 for the CFH geometry and from 0.0119 to 0.38 for the LDIFF geometry. Fluent commercial code with realizable k-ε turbulence model was used in this study to investigate how the pulsed jet performance was affected by varying: 1) pulsation frequency, 2) blowing ratio and 3) jet geometry.