| 殷林林1，王雷1，李鑫1，陈云1，马永军1，李军2.低压涡轮动叶叶顶间隙泄漏流动特性数值计算[J].航空发动机,2020,46(4):14-19 |
| 低压涡轮动叶叶顶间隙泄漏流动特性数值计算 |
| Numerical Caculation of the Leakage Flow Characteristics of Rotor Tip Clearance of Low PressureTurbine |
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| DOI： |
| 中文关键词: 低压涡轮级 带冠动叶叶顶 泄漏流动 气动性能 试验测量 数值模拟 航空发动机 |
| 英文关键词:low pressure turbine stage shrouded rotor tip leakage flow aerodynamic performance test measurement numerical
simulation aeroengine |
| 基金项目:航空动力基础研究项目资助 |
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| 中文摘要: |
| 为了获得低压涡轮动叶叶顶间隙泄漏流动特性，采用数值方法研究带冠动叶叶顶间隙对低压涡轮级气动性能的影响。
对试验测量的扇形带冠叶顶叶栅气动性能进行数值计算，得到的叶栅总压恢复系数与试验数据吻合良好，验证了数值方法的可靠
性。对没有间隙和3 种动叶叶顶间隙条件下低压涡轮级的气动性能和动叶叶顶间隙泄漏流动特性进行对比分析。结果表明：带冠动
叶叶顶间隙增大导致转子叶尖的出口气流角增大和叶顶间隙泄漏量增加；涡轮级气动效率降低和叶顶间隙泄漏量增加与带冠动叶
叶顶间隙增大呈近似线性变化；在相同叶顶间隙条件下，出口马赫数对叶顶间隙泄漏量的影响较小；随着涡轮级出口马赫数的提
高，出口气流角度减小。 |
| 英文摘要: |
| In order to obtain the leakage flow characteristics of rotor tip clearance of low pressure turbine，the influence of shrouded
rotor tip clearance on aerodynamic performance of low pressure turbine stage was studied by numerical method. The numerical calculation
of the measured cascade aerodynamic performance of the fan-shaped shrouded rotor tip was carried out. The total pressure recovery
coefficient of the obtained cascade was in good agreement with the test data and the reliability of the numerical method was verified. The
aerodynamic performance of the low pressure turbine stage and the leakage flow characteristics of the rotor tip clearance under the condition
of no clearance and three kinds of rotor tip clearance were compared and analyzed. The results show that the increase of the shrouded rotor
tip clearance leads to the increase of the outlet airflow angle of the rotor tip and the increase of the leakage rate of the tip clearance. The
decrease of aerodynamic efficiency of turbine stage and the increase of the leakage of the tip clearance were approximately linear with the
increase of the shrouded rotor tip clearance. Under the same condition of tip clearance，the influence of outlet Mach number on the leakage
rate of tip clearance is small. With the increase of outlet Mach number of turbine stage，the outlet airflow angle decreases. |
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