蜂窝叶顶密封对透平级气动性能的影响研究
发布时间：2018-11-07 13:34
【摘要】：采用数值计算方法研究了蜂窝叶顶密封的几何尺寸对汽轮机高压缸两级内气动性能的影响,分析了蜂窝密封的几何参数,包括密封间隙、蜂窝孔深、蜂窝孔径对透平级气动性能的影响规律。研究结果表明:随着蜂窝密封间隙的增大,动叶下游静叶内二次流损失增加,透平级内总总等熵效率下降,密封内泄漏量近似线性增加;随着蜂窝孔深的增大,总总等熵效率先增大后基本趋于定值,泄漏量则随孔深的增大先减小然后趋于定值;蜂窝孔径对透平级气动性能的影响主要取决于孔内和密封出口的泄漏流场结构,随着蜂窝孔径的增大,总总等熵效率逐渐增大,泄漏量逐渐减小;蜂窝密封间隙的变化对主流流场的影响显著,蜂窝孔径的变化对主流流场的影响次之,而蜂窝孔深对主流流场的影响较弱。
[Abstract]:The effect of the geometric dimension of the honeycomb blade top seal on the aerodynamic performance of the high pressure cylinder of steam turbine is studied by numerical method. The geometric parameters of the honeycomb seal, including the sealing clearance, the honeycomb hole depth, are analyzed. Effect of honeycomb aperture on aerodynamic performance of turbine stage. The results show that with the increase of honeycomb seal clearance, the secondary flow loss in the lower stator blade increases, the total Isentropic efficiency decreases and the leakage increases linearly. With the increase of honeycomb hole depth, the total Isentropic efficiency increases first and then tends to a fixed value, and the leakage decreases first and then tends to a fixed value with the increase of the hole depth. The effect of honeycomb aperture on the aerodynamic performance of turbine stage mainly depends on the leakage flow field structure in the hole and seal outlet. With the increase of honeycomb aperture the total Isentropic efficiency increases gradually and the leakage decreases gradually. The change of honeycomb seal clearance has a significant effect on the mainstream flow field, followed by the change of honeycomb aperture, while the effect of honeycomb depth on the mainstream flow field is weak.
【作者单位】： 西安交通大学叶轮机械研究所;
【基金】：国家自然科学基金资助项目(51106122;51576151)
【分类号】：TK261
本文编号：2316524
[Abstract]:The effect of the geometric dimension of the honeycomb blade top seal on the aerodynamic performance of the high pressure cylinder of steam turbine is studied by numerical method. The geometric parameters of the honeycomb seal, including the sealing clearance, the honeycomb hole depth, are analyzed. Effect of honeycomb aperture on aerodynamic performance of turbine stage. The results show that with the increase of honeycomb seal clearance, the secondary flow loss in the lower stator blade increases, the total Isentropic efficiency decreases and the leakage increases linearly. With the increase of honeycomb hole depth, the total Isentropic efficiency increases first and then tends to a fixed value, and the leakage decreases first and then tends to a fixed value with the increase of the hole depth. The effect of honeycomb aperture on the aerodynamic performance of turbine stage mainly depends on the leakage flow field structure in the hole and seal outlet. With the increase of honeycomb aperture the total Isentropic efficiency increases gradually and the leakage decreases gradually. The change of honeycomb seal clearance has a significant effect on the mainstream flow field, followed by the change of honeycomb aperture, while the effect of honeycomb depth on the mainstream flow field is weak.
【作者单位】： 西安交通大学叶轮机械研究所;
【基金】：国家自然科学基金资助项目(51106122;51576151)
【分类号】：TK261
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1 韩瑜,朱丹书;汽轮机阀门的设计[J];上海汽轮机;1998年04期
，本文编号：2316524
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