Effects of Trailing Edge Serrations on Rotor/Stator Interaction Noise in Low-Pressure Turbines

被引：0
|
作者：
Yang C.-H. [1 ]
Feng H.-Y. [1 ]
Peng Y.-H. [2 ]
机构：
[1] Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment, School of Mechanical Engineering, Hunan University of Science and Technology, Xiangtan
[2] School of Mathematics and Computational Science, Hunan University of Science and Technology, Xiangtan
来源：
Tuijin Jishu/Journal of Propulsion Technology | 2022年 / 43卷 / 05期
关键词：
Aerodynamic noise; Axial gap; Interference; Low-pressure turbine; Trailing edge serration;
D O I：
10.13675/j.cnki.tjjs.200755
中图分类号：
学科分类号：
摘要：
In order to achieve the design goal of 'more compact axial gap, higher economy and lower noise' of modern aeroengine, the axial gap of low-pressure turbines is designed to be shorter. However, the shorter axial gap will seriously affect the aerodynamic performance and rotor/stator interaction noise of the turbines, and higher requirements and challenges are put forward for flow and noise control methods. Therefore, the large eddy simulation and FW-H equation were used to study the rotor/stator interaction noise and aerodynamic performance changes of a one-stage low-pressure turbine cascade when the trailing edge of upstream stator adopts short or long sawtooth structures under different axial gaps. The results show that the shortening of the axial gap will cause the deterioration of the aerodynamic performance of the low-pressure turbine, and the leading edge of the downstream rotor will experience a stronger adverse pressure gradient and 'negative jet' effect, thereby increasing the rotor/stator interaction noise. The micro-jet generated by the serrated structure of the trailing edge of the stator can suppress the 'negative jet' effect, eliminate separation bubbles, weaken the unsteady interference effect, improve aerodynamic performance, and reduce noise. In the case of short axial gap, the noise of long serrated trailing edge is lower. Compared with the base model, the long serrated trailing edge stator can reduce the wake loss by 47.71%, increase the mass flow by 8.65%, increase the total pressure recovery coefficient by 0.88 %, reduce the tonal noise of the 1BPF (Blade passing frequency) and 2BPF by 8.7dB and 11.8dB, respectively, and reduce the A-weighting sound pressure level by 9dB. In the case of shortening the axial gap, the trailing edge of the stator adopts a bionic sawtooth structure, which can achieve both aerodynamic performance improvement and noise reduction. © 2022, Editorial Department of Journal of Propulsion Technology. All right reserved.
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页码：127 / 136
页数：9
相关论文
共 32 条
  • [1] Fletcher N, Marks C R, Sondergaard R, Et al., Characterization of Periodic Unsteadiness Generator for Secondary Flow Studies
  • [2] Perez E, Schmitz J T, Jaffa N A, Et al., Detailed Experimental Measurement and RANS Simulation of a Low Pressure Turbine with High Lift Blading
  • [3] WANG Ying-feng, HU Jun, WANG Zhi-qiang, Effect of Stator-Rotor Interactions on the Blades Surface Pressure, Journal of Propulsion Technology, 31, 2, pp. 198-203, (2010)
  • [4] WANG Zhong-qi, WANG Song-tao, ZHANG Long-xin, Performance Evaluation of a Low-Reaction Compressor with Different Axial Spacing by 2D Unsteady Simulation, Journal of Propulsion Technology, 38, 10, pp. 2218-2223, (2017)
  • [5] Howe M S., Aerodynamic Noise of a Serrated Trailing Edge, Journal of Fluid and Structures, 5, 1, pp. 33-45, (1991)
  • [6] Howe M S., Noise Produced by a Sawtooth Trailing Edge, The Journal of the Acoustical Society of America, 90, 1, pp. 482-487, (1991)
  • [7] (2015)
  • [8] JI Liang, QIAO Wei-yang, WANG Liang-feng, Et al., Experimental Investigation of Airfoil Trailing-Edge Noise Reduction in a Normal Indoor Test Bed, Journal of Propulsion Technology, 36, 5, pp. 703-712, (2015)
  • [9] Dassen T, Parchen R, Bruggeman J, Et al., Results of a Wind Tunnel Study on the Reduction of Airfoil Self-Noise by the Application of Serrated Blade Trailing Edges, (1996)
  • [10] Braun K A, Van der Borg N J C M, Dassen A G M, Et al., Serrated Trailing Edge Noise, Proceedings of European Wind Energy Conference, pp. 80-183, (1999)
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