低雷诺数下低压涡轮叶片振动对分离及转捩的影响机制

张英强; 张燕峰; 朱淼怡; 董旭; 王名扬; 卢新根

doi:10.13224/j.cnki.jasp.20220631

低雷诺数下低压涡轮叶片振动对分离及转捩的影响机制

doi: 10.13224/j.cnki.jasp.20220631

张英强^{1, 2},
张燕峰^{2, 3,*, ,},
朱淼怡^{1, 2},
董旭²,
王名扬²,
卢新根^{2, 3}

1.
华北电力大学能源动力与机械工程学院，北京 102206
2.
中国科学院工程热物理研究所轻型动力重点实验室，北京 100190
3.
中国科学院大学，北京 100049

基金项目: 国家自然科学基金（52276044）

详细信息

作者简介:
张英强（1998-），男，硕士生，主要从事叶轮机械气动热力学研究

通讯作者:
张燕峰（1983-），男，研究员，博士，研究领域为叶轮机械气动热力学。E-mail：zhangyf@iet.cn

中图分类号: V232.4
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- 被引次数: 0
出版历程
- 收稿日期: 2022-08-29
- 网络出版日期: 2024-03-04

Influence mechanism of low-pressure turbine blade vibration on separation and transition at low Reynolds number

ZHANG Yingqiang^{1, 2},
ZHANG Yanfeng^{2, 3,*
, ,},
ZHU Miaoyi^{1, 2},
DONG Xu²,
WANG Mingyang²,
LU Xingen^{2, 3}

1.
School of Energy，Power and Mechanical Engineering，North China Electric Power University，Beijing 102206，China
2.
Key Laboratory of Light-duty Gas-turbine，Institute of Engineering Thermophysics，Chinese Academy of Sciences，Beijing 100190，China
3.
University of Chinese Academy of Sciences，Beijing 100049，China

摘要

摘要:
低压涡轮叶片振动显著影响边界层演化过程和流动状态，进而影响气动性能。为了探究低压涡轮叶片振动对分离转捩的影响机制，利用数值模拟手段对比分析了低雷诺数（Re=25000）下低压涡轮叶片不同频率的振动对吸力面边界层分离及转捩和流动损失的影响。研究表明：叶片因振动与流体产生的相对运动使分离流与主流提前相遇从而引发转捩提前，限制分离泡的发展，缩减分离泡的尺寸，削弱分离泡内部回流掺混。叶片振动使边界层厚度有所减小，削弱了尾缘附近的流动阻塞与尾迹掺混，大幅度降低了分离及转捩过程中的湍流脉动水平，上述变化使总压损失得到了大幅度降低，最高可以降低23.02%，气动性能得到大大改善。
- 叶片振动 /
- 低压涡轮叶片 /
- 分离 /
- 转捩 /
- 气动损失
Abstract:
Numerical simulation methods were used to compare and analyze the effects of low-pressure turbine blade vibration at different frequencies on the separation and transition of suction surface boundary layer and flow losses at low Reynolds number (Re=25000), with its aim of exploring the influence mechanism of low-pressure turbine blade vibration on separation and transition. The research showed that the relative motion between the fluid and the blade due to the blade vibration made the separation flow meet the main flow in advance. The advanced transition caused by this was able to limit the development of the separation bubble, reduce the size of the separation bubble and weaken the backflow mixing inside the separation bubble. The blade vibration thinned the boundary layer, weakened the flow blockage and wake mixing near the trailing edge and substantially lowered the turbulent pulsation level in the separation and transition process. Furthermore, the impacts above reduced the total pressure loss up to 23.02%, and improved the aerodynamic performance significantly.
- blade vibration /
- low-pressure turbine blade /
- separation /
- transition /
- aerodynamic loss

HTML

图 1 计算域网格

Figure 1. Computational domain grid

下载: 全尺寸图片幻灯片

图 2 静止叶片静压分布系数数值模拟结果与试验结果对比

Figure 2. Comparison of numerical simulation and experiment results of static pressure distribution coefficient when the blade is stationary

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图 3 静止和振动叶片吸力面壁面摩擦力对比

Figure 3. Comparison of the friction force on suction surface of stationary and vibrating blades

下载: 全尺寸图片幻灯片

图 4 静止和振动叶片吸力面壁面时均速度对比

Figure 4. Comparison of time-averaged velocities on suction surface of stationary and vibrating blades

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图 5 静止和振动叶片吸力面不同流向位置处速度型对比

Figure 5. Comparison of boundary layer velocity at various streamwise locations on blade suction surface of stationary and vibrating blades

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图 6 叶片以175 Hz频率振动时吸力面不同时刻的瞬态压力场及流线分布

Figure 6. Transient pressure field and streamline distribution on suction surface at different times of vibrating blade with 175 Hz

下载: 全尺寸图片幻灯片

图 7 叶片以175 Hz频率振动不同时刻吸力面壁面摩擦力分布

Figure 7. Friction force distribution on suction surface at different times of vibrating blade with 175 Hz

下载: 全尺寸图片幻灯片

图 8 静止和振动叶片吸力面边界层参数对比

Figure 8. Comparison of boundary layer parameters on suction surface of stationary and vibrating blades

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图 9 静止和振动叶片吸力面湍流度对比

Figure 9. Comparison of turbulence near suction surface of stationary and vibrating blades

下载: 全尺寸图片幻灯片

图 10 静止叶片及不同振动频率叶片叶型损失对比

Figure 10. Comparison of profile losses among stationary blades and blades with different vibration frequencies

下载: 全尺寸图片幻灯片

表 1 叶型PACK-B的几何特性及气动参数

Table 1. Geometric characteristics and aerodynamic parameters of airfoil PACK-B

参数数值

弦长C/mm 83.28
轴向弦长C_ax/mm 75.4
栅距S/mm 66.8
几何进气角β₁/（°） 35
几何出气角β₂/（°） 60
载荷系数 1.1

下载: 导出CSV

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