| 径向封严腔几何参数对涡轮性能影响的数值研究 |
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| 引用本文： | 贾惟.径向封严腔几何参数对涡轮性能影响的数值研究[J].科学技术与工程,2018,18(11). |
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| 作者姓名： | 贾惟 |
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| 作者单位： | 中国民航大学天津市民用航空器适航与维修重点实验室 |
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| 基金项目： | 国家自然科学基金委员会与中国民用航空局联合资助项目（批准号：U1633113），中央高校基本科研业务费中国民航大学专项（3122017086），中国民航大学科研启动基金项目（2014QD06X）资助 |
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| 摘 要： | 为了研究径向封严腔几何参数对涡轮性能的影响,对转/静叶片之间带有封严腔的某高负荷单级涡轮进行了三维定常数值模拟。结果表明,径向间隙和轴向间隙对气动效率的影响程度大于轴向重叠度,几何参数改变导致轮毂二次流损失的变化是影响气动效率的主要因素。轴向间隙对封严效率的影响最大,径向间隙次之,轴向重叠度最小。气流在发卡弯加速后膨胀形成的大尺度旋涡,是轴向间隙能够产生较好封严效果的物理原因。
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| 关 键 词： | 径向间隙 轴向间隙 轴向重叠度 气动效率 封严效率 |
| 收稿时间： | 2017/9/11 0:00:00 |
| 修稿时间： | 2017/9/11 0:00:00 |
Numerical Investigation of the Effects of Geometric Parameters in Radial Rim Seal Cavity on Turbine Performance |
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| JIA Wei.Numerical Investigation of the Effects of Geometric Parameters in Radial Rim Seal Cavity on Turbine Performance[J].Science Technology and Engineering,2018,18(11). |
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| Authors: | JIA Wei |
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| Institution: | Tianjin Key Laboratory of Civil Aircraft Airworthiness and Maintenance,Civil Aviation University of China |
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| Abstract: | Three-dimensional steady simulation of a highly-loaded turbine stage with inter-stage cavity has been carried out for analyzing the effects of geometric parameters of radial rim seal cavity on turbine performance. Results show that the influence of radial clearance and axial clearance on aerodynamic efficiency is more distinct than that of axial overhang. Secondary flow loss due to the variation of geometric parameters is the key factor of aerodynamic efficiency change. Axial clearance has the greatest effect on sealing efficiency, radial clearance take second place and axial overhang has the least effect. Larger scale vortex forms due to the acceleration through the hairpin and expansion in the cavity of purge flow is the main reason for the better sealing effect of smaller axial clearance. |
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| Keywords: | radial clearance axial clearance axial overhang aerodynamic efficiency sealing efficiency |
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