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| Numerical Simulation Analysis on Aerodynamic Noise of the Vehicle Alternator |
| ZHANG Ya-dong 1, DONG Da-wei 2, YAN Bing 2, ZHANG Ji-ye 1, WANG Yuan-wen 2 |
1. State Key Laboratory of Traction Power, Southwest JiaoTong University, Chengdu 610031;
2. School of Mechanical Engineering, Southwest JiaoTong University, Chengdu 610031 |
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Abstract The characteristics of three-dimension flow dynamics of a certain type of vehicle alternator (claw-pole alternator) are simulated numerically with computational fluid dynamics technique. The sliding mesh technology and large eddy simulation are applied to study the aerodynamic noise of alternator. The numerical predictions of main alternator noise orders and their magnitudes obtained by LES are in good consistency with experimental results. The front and rear blades are the aerodynamic noise sources for this type of alternator. The main components of aerodynamic noise are the 6 th, 8 th, 10 th, 12 th and 18th orders. On this basis of numerical simulation, taking low noise and high flow as an optimal object, study the optimal design and noise reduction of aerodynamic noise about the angle of front end cover to radial grid. After changing the 40°angle of front end cover to radial grid, it is obvious that not only the total noise is lowest but also the mass flow rate is highest. This research can provide practical reference for the improvement of aerodynamic performance and high speed noise for vehicle alternator.
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Received: 04 September 2014
Published: 25 December 2015
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