Volume 19, Issue 5 (May 2019)                   Modares Mechanical Engineering 2019, 19(5): 1049-1059 | Back to browse issues page

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Talesh Bahrami H, Parhizkar H, Ghasemlooy S. Numerical Study of the Effect of Flow Suction on the Reduction of Acoustic Noise Due to the Flow on a Three-Dimensional Cylinder. Modares Mechanical Engineering 2019; 19 (5) :1049-1059
URL: http://mme.modares.ac.ir/article-15-18131-en.html
1- Mechanical Engineering Department, Mechanic Faculty, Iran University of Science and Technology, Tehran, Iran
2- Aerodynamics Department, Aerospace Faculty, Malek Ashtar University of Technology, Tehran, Iran , hparhiz@mut.ac.ir
3- Aerodynamics Department, Aerospace Faculty, Malek Ashtar University of Technology, Tehran, Iran
Abstract:   (8044 Views)
one of the key issues in the design of high-speed modern devices such as giant aircraft and high-speed trains. In this regard, it is to design these devices in such a way to have at least aerodynamic noise. The cylinder, as a bluff body, is widely used in the design of various devices, such as a landing gear. Therefore, the reduction of cylinder noise can be widely used. In the present study, numerical solution is used to present a method for reducing the noise generated by flow on the cylinder. This is done by flow suction from the grooves the cylinder. Acoustic numerical calculations were performed, using LightHill's acoustic analog approach in the form of wave equations of Ffowcs-Williams & Hawkings model. The numerical solution is performed in the three-dimensional unsteady form, using the large eddy simulation turbulence model. The characteristics of the grooves, such as their dimensions and distance the generated acoustic noise have been studied. The results show that the active control method presented in this paper is an effective and yet simple way to control noise. The cylinder used in the present study produces a noise of about 110 dB at a speed of 250 km/h. According to the results, it can be said that by optimally arranging the number of slots and creating a proper flow suction, its sound level can be reduced to about 60 dB.
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Article Type: Original Research | Subject: Computational Fluid Dynamic (CFD)
Received: 2018/03/25 | Accepted: 2018/04/8 | Published: 2019/05/1

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