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为了减小可调导叶端壁间隙引起泄露损失,在导叶两端分别增加一个圆盘,圆盘分别嵌入到机匣和轮毂内,导叶附近的机匣和轮毂设计为同心球面,圆盘在流道内的表面分别与机匣和轮毂共球面,同时导叶的旋转轴过球心,保证了导叶旋转时流道保持一致。通过数值模拟的方法对比分析了导叶两端增加圆盘设计与导叶两端无间隙和全间隙时涡轮的性能,结果表明:导叶两端增加圆盘设计可明显减小可调导叶端壁间隙引起的泄露损失,提高涡轮的性能。
In order to reduce the leakage caused by the gap of the adjustable guide vanes, two disks are respectively added to the two ends of the guide vanes. The disks are respectively embedded in the casing and the hub. The casing and the hub near the guide vanes are designed as concentric spherical and circular The surface of the disk in the flow path is respectively co-spherical with the casing and the hub, meanwhile, the rotation axis of the guide vane passes the ball center to ensure that the flow path of the guide vane is consistent during rotation. By numerical simulation, the performance of turbines at both ends of guide vanes with no additional clearance and full clearance at both ends of the guide vane is analyzed and compared. The results show that the design of disk with both ends of guide vanes can obviously reduce the size of adjustable guide vanes Leakage caused by the end wall gap loss, improve turbine performance.