Film-cooling of cylindrical hole with downstream surface dielectric barrier discharge actuators》.pdfVIP

Film-cooling of cylindrical hole with downstream surface dielectric barrier discharge actuators》.pdf

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Film-cooling of cylindrical hole with downstream surface dielectric barrier discharge actuators》.pdf

International Journal of Heat and Mass Transfer 90 (2015) 825–837 Contents lists available at ScienceDirect International Journal of Heat and Mass Transfer journal homepage: www.else /locate/ijhmt Film-cooling of cylindrical hole with downstream surface dielectric barrier discharge actuators Sheng-ji Dai a, Yang Xiao a,b, Li-ming He a,⇑, Tao Jin a, Qian Zhang a, Peng-hui Hou a, Zi-chen Zhao a a Aeronautics and Astronautics Engineering College, Air Force Engineering University, Xi’an 710038, China b Research Institute of Army Aviation, Beijing 101121, China a r t i c l e i n f o a b s t r a c t Article history: This paper presents a new way to improve film-cooling performance by using surface dielectric barrier Received 21 November 2014 discharge actuators installed downstream from film-cooling hole. Results provide insight into the flow Received in revised form 21 May 2015 field characteristic and film-cooing effectiveness of both primary cylindrical hole with and without Accepted 1 July 2015 actuator, and a comparison is made. The velocity field near the test surface is found to be significantly Available online 20 July 2015 changed under the effect of actuator, resulting in a new pair of vortexes of which the rotating direction is opposite to that of counter rotating vortex pair. Under the effect of new vortex pair, the trend of hot Keywords: main flow pushing jet flow up is impeded and the jet flow is induce

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