Abstract
Jet impingement is one of effective methods adopted to enhance the local heat transfer coefficient between cooling air stream andblades. For the impingement created by multi-holes located in the blade midchord region orthe leading edge, the jet nozzle diameter D of impingement tubes is one of the parameters having significantly effects on the heat exchange coefficient. The paper uses ANSYS-CFX software to simulate the heat exchange characteristics of 3 multi-hole impingement tube taking into account the velocity ratio of jet flow and cross flow (VR = 3, 5, 7): 4 holes (2×2) with diameter D = 0.75mm, 9 holes (3×3) D=0.5mm, 25 holes (5×5) D = 0.3mm. The results showed that the smaller the jet diameter is, the more significant influence the cross flow has influence on the heat transfer coefficient, and a diameter of D=0.5mm yields the highest heat transfer coefficient.
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