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为了达到减小涡轮叶片叶顶间隙泄露的目的,应用数值模拟并辅之试验的方法对叶顶间隙泄漏流动形成机理、涡轮自适应叶顶喷气控制机理及其对间隙流动的控制作用进行了研究。在此基础上,着重研究了进口位置、出口位置、喷气孔直径等自适应叶顶喷气孔参数以及叶顶间隙大小,对叶顶喷气效果的影响规律。结果表明:自适应叶顶喷气孔进口位置对叶顶喷气性能影响不大;出口位置在叶顶中部,靠近压力面时,叶顶喷气效果最佳;喷气孔直径为2mm(d/H=4.8%相对叶高)时效果较好;叶顶间隙越大,叶顶喷气效果越差,当间隙取到2mm(t/H=4.8%相对叶高)时,叶顶喷气已经失去控制间隙泄漏的作用了。
In order to reduce the leakage of tip clearance of turbine blade, the formation mechanism of tip clearance leakage flow, the control mechanism of turbine adaptive tip jet and its control on the flow of clearance are studied by numerical simulation and the auxiliary test . On this basis, the effects of inlet tip position, exit position, jet diameter and other adaptive tip jet parameters and tip clearance on the effect of tip jet are studied emphatically. The results show that the position of the inlet of the adaptive tip jet has little effect on the jet performance at the tip of the blade. The outlet effect of the tip jet is best when the outlet is near the pressure surface in the middle of the blade tip. The jet diameter is 2mm (d / H = 4.8 % Relative leaf height). The larger the tip clearance is, the worse the effect of tip jet is. When the gap is 2mm (t / H = 4.8% of the relative leaf height), the tip jet has lost control gap leakage Effect