Abstract
In the near future, when designing and using Double Wall Airfoils, which will be manufactured by 3D printers, the positional relationship between the impingement cooling nozzle and the heat transfer enhancement ribs on the target plate naturally becomes more accurate. Taking these circumstances into account, an experimental study was conducted to enhance the heat transfer of the wall jet region of a round impingement jet cooling system. This was done by installing circular ribs or vortex generators (VGs) in the impingement cooling wall jet region. The local heat transfer coefficient was measured using the naphthalene sublimation method, which utilizes the analogy between heat and mass transfer. As a result, it was clarified that, within the ranges of geometries and Reynolds numbers at which the experiments were conducted, it is possible to improve the averaged Nusselt number Nu up to 21% for circular ribs and up to 51% for VGs.
Highlights
To increase specific thrust and to improve thermal efficiency, the inlet temperature of jet engines and industrial gas turbines tends to increase ever further
At location r/D = 3.5, heat transfer experiments were conducted by changing the height of the circular rib between e/δ = 0.58, 1.0 and 1.42
A study aimed at enhancing heat transfer in the wall jet region of impingement cooling suitable for
Summary
To increase specific thrust and to improve thermal efficiency, the inlet temperature of jet engines and industrial gas turbines tends to increase ever further. Turbine inlet temperatures of the latest jet engines and industrial gas turbines are currently at the level of 1600 to 1700 ◦ C [1]. Impingement jet cooling, serpentine flow passages with ribs, pin-fin cooling, etc., are used as cooling methods for turbine vanes and blades for internal cooling. Film cooling is used for cooling the outer surfaces Among these cooling methods, the importance of film cooling increases as the thermal load increases. Among the internal cooling methods, impingement cooling is widely used, especially for stationary parts, because it is possible to control the heat transfer coefficient locally and globally and attain a more uniform wall temperature
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