Authors: Yuma Fukushima, Noriyoshi Kato, Yuriko Takeshima, Shigeru Obayashi
Abstract: The characteristic noise generated from a dive bomber used during World War II is computationally analyzed with the help of visualization and reproduction of generated noise. It is observed from the results of flow field analysis that the large separation occurs from the strut of the dive brake when it is deployed. This is the sound source of characteristic noise. From the results of aeroacoustic analysis, large sound pressure fluctuations are generated from the strut of the deployed dive brake. In addition, the frequency characteristics of the computed sound pressure fluctuations are compared with those of the recorded noise, where the agreement of the fundamental frequency was confirmed. The characteristics and loudness of generated noise can be understood intuitively by the reproduction of noise in addition to the visualization results.