Microvane in controlling noise in open cavity flow

International Conference on Aerospace and Mechanical Engineering 2017

航空航天工程;机械制造

Aliashak, M.Z.M.^1 ; Saad, M.R.^1 ; Latif, A.T.^1 ; Idris, A. Che^1 ; Rahman, M.R.A.^1

Department of Mechanical Engineering, Faculty of Engineering, Universiti Pertahanan Nasional Malaysia, Kem Perdana Sungai Besi, Kuala Lumpur

57000, Malaysia^1

关键词: Aircraft performance;    Cavity noise;    Counter rotating;    Depth ratio;    Flow speed;    Open cavity flow;    Sound pressure level;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/370/1/012016/pdf
DOI  :  10.1088/1757-899X/370/1/012016

学科分类：航空航天科学

来源: IOP

【 摘 要 】

The cavity can be commonly found in aircraft and they are used to store weapons, cargo and also landing gear. Despite the importance of cavity, they can cause vibrations and noise that can disturb the aircraft performance. In order to overcome these problems, the microvane had been studied in controlling noise on open cavity flow. The investigation was carried out at a flow speed of 64.97 meters per second with Reynolds number of 4.3 × 106per meter on cavity with length over depth ratio of 5. The study tested two configurations of microvane which are counter-rotating and co-rotating orientation. The results show that counter-rotating microvane performed better than co-rotating microvane to suppress cavity noise. The use of counter-rotating microvane managed to reduce the sound pressure level throughout the cavity by 3 % with the highest reduction of 24 decibels. However, the co-rotating microvane cause overall increase of sound pressure level by 0.3 % with the highest reduction of 7 decibels.