Microvane in controlling noise in open cavity flow

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 × 10⁶ per 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. (paper)