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浙江大学学报(工学版)
Journal of ZheJiang University (Engineering Science)  2022, Vol. 56 Issue (4): 823-832    DOI: 10.3785/j.issn.1008-973X.2022.04.023
    
Experimental research on cold flow field characteristics of turbine blade oblique rib channel
Shuang LIN(),Rong WU*(),Bo WANG,Zi-jie ZHANG,Kun-teng WEI
School of Aerospace Engineering, Xiamen University, Xiamen 361102, China
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Abstract  

The experimental models of ribbed channel with different angles were designed in order to analyze the flow field characteristics and heat transfer mechanism of the internal ribbed channel of turbine blade. The statistical average characteristics and unsteady flow field of typical section of the channel were analyzed by flow visualization experiment and particle image velocimetry experiment. Reducing angle can reduce the blocking effect of the rib on the fluid and increase the longitudinal range and strength of the vortex behind the rib when the angle between the spoiler and the flow direction is between 60°~90°. The reflux strength of the first rib increases first and then decreases with the decrease of angle, and the longitudinal impact strength of the second rib increases. The oblique rib structure can improve the peak Reynolds stress of the mainstream fluid and the intercostal fluid, enhance the intensity of intercostal disturbance and improve the heat transfer characteristics of the channel. Reducing angle can improve the amplitude and frequency of velocity oscillation, and improve the heat transfer efficiency of the channel. Reducing angle can increase the energy and energy fluctuation frequency of the fluid flow along the rib, and make the vortex easier to exchange energy with the target surface in the process of backward shedding.

Key words： turbine blade      rib      particle image velocimetry (PIV)      shedding vortex frequency      proper orthogonal decomposition (POD)     
Received: 27 May 2021      Published: 24 April 2022
CLC:  V 232  
Fund:  国家自然科学基金资助项目（11072206）；装备预研教育部联合基金资助项目（6141A02033529）
Corresponding Authors: Rong WU     E-mail: shuanglinxmu@163.com;wur@xmu.edu.cn
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Shuang LIN
Rong WU
Bo WANG
Zi-jie ZHANG
Kun-teng WEI
Cite this article:

Shuang LIN,Rong WU,Bo WANG,Zi-jie ZHANG,Kun-teng WEI. Experimental research on cold flow field characteristics of turbine blade oblique rib channel. Journal of ZheJiang University (Engineering Science), 2022, 56(4): 823-832.

URL:

https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2022.04.023     OR     https://www.zjujournals.com/eng/Y2022/V56/I4/823


涡轮叶片斜肋通道冷态流场特性的实验研究

为了探究涡轮叶片内部肋通道的流场特性与换热机理，设计不同角度的带肋通道实验模型. 采用流动显示实验与粒子图像测速实验，对通道的典型截面流场进行统计平均特性分析与非定常分析. 结果表明，当扰流肋与流向的夹角为60°~90°时，减小夹角能够降低扰流肋对流体的阻挡作用，增大扰流肋后方旋涡的纵向范围与强度. 减小夹角使第1个肋区间的回流强度先增大后减小，第2个肋区间流体的纵向冲击强度增大. 斜肋结构能够提高主流流体与肋间流体的雷诺应力峰值，增强肋间扰动强度，提升通道的换热特性. 减小夹角可以提升流场的速度振荡幅值与振荡频率，提高通道的换热效率. 减小夹角可以增大流体沿肋向流动的能量与能量波动频率，使得旋涡在向后脱落的过程中更易于与靶面进行能量交换.


关键词： 涡轮叶片,  扰流肋,  粒子图像测速(PIV),  脱落涡频率,  本征正交分解(POD) 
Fig.1 Water tunnel and PIV system
Fig.2 Rib model and PIV acquisition area
Fig.3 Flow visualization and PIV experimental camera position
Fig.4 Quality of tracer particles
Fig.5 Changing process of flow field between 90° ribs
Fig.6 Changing process of flow field between 60° ribs
Fig.7 Time averaged flow field in middle section of 60°, 70°, 80° and 90° ribs
Fig.8 Velocity distribution above heat transfer target
Fig.9 Time averaged vorticity in middle section of 60°, 70°, 80° and 90° ribs
Fig.10 Turbulence intensity in middle section of 60°, 70°, 80° and 90° ribs
Fig.11 Position of velocity probe in flow field
Fig.12 Amplitude variation of velocity probe position with frequency
Fig.13 70° rib POD coefficient variation of first two modes
Fig.14 70° rib amplitude variation of first two modes with frequency
Fig.15 90° rib vorticity field corresponding of first four modes
Fig.16 80° rib vorticity field corresponding of first four modes
Fig.17 70° rib vorticity field corresponding of first four modes
Fig.18 60° rib vorticity field corresponding of first four modes
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