Korea University · Engineering
Professor Jin Taek Chung's research lab specializes in turbomachinery aerodynamics, with a primary focus on secondary flow control and film cooling enhancement in gas turbines. The lab investigates vortex dynamics—particularly horseshoe and passage vortices—within turbine passages and develops innovative flow management techniques such as boundary layer fences to mitigate flow losses and improve cooling effectiveness. Their work is highly relevant to advanced turbine design, emphasizing performance optimization under realistic engine conditions, including high freestream turbulence. The lab combines experimental flow visualization, wind tunnel testing, and computational analysis to advance fundamental understanding and practical applications in gas turbine technology.
Figures are computed from collected data and may differ slightly.
A flow management technique designed to reduce some harmful effects of secondary flow in the endwall region of a turbine passage is introduced. A boundary layer fence in the gas turbine passage is shown to improve the likelihood of efficient film cooling on the suction surface near the endwall. The fence prevents the pressure side leg of the horseshoe vortex from crossing to the suction surface and impinging on the wall. The vortex is weakened and decreased in size after being deflected by the f
A secondary flow management technique which employs a boundary layer fence on the endwall of a gas turbine passage is evaluated under freestream turbulence conditions that are representative of turbine conditions. A turbulence generator, which was able to reproduce the characteristics of the combustor exit flow, was used. The horseshoe and passage vortices observed in previous tests with low turbulence level remain coherent and strong within the cascade passage when the intensity is elevated to
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