Investigation On Flow And Heat Transfer Characteristics With Array Impingement Jet And Out Flow

Composite cooling (impingement / filming ) of turbine blade is a typical cooling method. Based on internal cooling structures of turbine blade, numerical and experimental study are conducted to reveal flow and heat transfer characteristics of array impingement jet /outflow, inorder to provide theoretical basis and technical support for precise design of high-performance turbine blades.First, as for panel array impingement jet /over flow, the following conclusions are obtained: 1.different relative positions have little impact on flow characteristics, but a slight change over heat transfer ; heat transfer performance is slightly better when impingement hole located backside film hole; 2.film inclined hole has better heat transfer performance than upright hole with larger flow loss; 3. jet Reynolds number is the most important factor of heat transfer performance, the increment of jet contributes to significant enhancement of heat transfer effectiveness but with larger flow loss; 4.initial crossflow does good to heat transfer performance; 5. The more film outflow, the stronger the outflow effectiveness, the better hear transfer; 6. the experiment results are fully consistent with the calculation results.Afterwards, this paper put a study on concave plate array impingement jet /outflow and concludes several conclusions: 1. As the jet Reynolds number increases, heat transfer performance enhances greatly while total pressure loss coefficient increases too; 2. Increment of film outflow has slight impact on heat transfer and little contribution to total pressure loss coefficient; 3. the experiment results are fully consistent with the calculation results.