The life assessment and the efficiency of turbine cooling blades and vanes are seriously affected by the cooling air delivery system of a gas turbine. The pre-swirl system in a gas turbine plays an important role between the stationary and rotating parts to supply enough cooling air at the appropriate temperature at the expense of pressure drop. In the stationary part, the pre-swirl nozzle creates the flow angle in advance of the rotating orifice, called the receiver hole, to minimize energy loss. However, because of the sudden change of direction and area of the flow path, an energy loss occurs at the inlet of the receiver holes. The circumferential velocity at the receiver hole inlet decreases even though the circumferential velocity at the pre-swirl outlet is equal to the tangential velocity of the turbine rotor system. To reduce the energy loss at the pre-swirl system, various shape parameters can be applied to the receiver hole, and the area ratio between the pre-swirl nozzle throat area and the receiver hole cross-sectional area can also be varied considering the structure problem, mass flow rate, and pressure drop. In this study, the shape of the receiver holes and its effects were analyzed using a 3D CFD method that was validated by previous studies including experimental data. The edge shape, inclined angle, area ratio, and number of receiver holes were analyzed with the discharge coefficient, adiabatic effectiveness, and pressure drop. The pre-swirl system perform-ance increased as the area ratio increased, and under fixed area ratio, a large number of smalldiameter receiver holes showed better performance. The receiver hole edge fillet was the most influential shape parameter in pre-swirl performance.

燃气涡轮机的冷却空气输送系统严重影响了涡轮机冷却叶片和叶片的寿命评估以及效率。燃气轮机中的预旋流系统在固定部件和旋转部件之间起着重要的作用，以适当的温度提供足够的冷却空气，但会降低压降。在固定部分中，预旋喷嘴在称为接收器孔的旋转孔之前创建了流动角度，以最大程度地减少能量损失。然而，由于流动路径的方向和面积的突然变化，能量损失发生在接收孔的入口处。即使在预旋流出口处的圆周速度等于涡轮转子系统的切向速度，接收器孔入口处的圆周速度也会降低。为了减少预旋流系统的能量损失，可以将各种形状参数应用于接收器孔，并且考虑到结构，还可以改变预旋流喷嘴喉部面积与接收器孔横截面积之间的面积比。问题，质量流量和压降。在这项研究中，使用3D CFD方法分析了接收孔的形状及其影响，该方法已通过先前的研究（包括实验数据）进行了验证。分析了边缘形状，倾斜角，面积比和接收孔的数量，并计算了排放系数，绝热效果和压降。预旋系统性能随面积比的增加而增加，在固定面积比下，大量小直径的接收孔表现出更好的性能。