Zamana Bağli Sikiştirilamaz Kavi̇te Akişinin Aeroakusti̇k Anali̇zi̇

Abstract

Kavite akışına ait Rossiter modları incelenmiş ve FW-H Akustik Analoji sonuçları ile karşılaştırılmıştır  FW-H denklemleri geçişli iç yüzey ile 3 boyutlu kavite için incelenmiştir  Türbülansın kavite gürültüsüne etkisi gösterilmiştir

Zamana Bağlı Kavite Akışı Aeroakustiğinin Büyük Girdap Simülasyonu ile Sayısal Olarak İncelenmesi

“…U is the incoming free stream velocity magnitude and Ma is the Mach number of the free stream. Phase delay of two vortices separating at the leading wall of cavity is symbolized by α. κ is defined as ratio of vortex convective speed to free stream velocity magnitude [8]. To indicate the details of the eddies past the cavity, the flow field is visualized with isosurfaces past the cavity as shown in Figure 11.…”

“…Additionally, a different permeable acoustic source surface which covers the cavity like a reverse box is used to activate quadrupole term of FW-H equation. It is shown that adding a quadrupole term increases sound level in the high frequency range [8]. In 2017, Zafer and Konan studied the effect of cavityairfoil interaction with passive control on the acoustic signal.…”

“…It is shown this interaction causes a 20-dB increase in the SPL-Frequency spectrum of 100 Hz while no significant change is observed in low frequency range [16]. In 2018, Zafer and Cosgun studied a cavity geometry other than in [8]. Comparison of various turbulence models used for low Mach number cavity flows showed that DES approach is superior than other RANS models in terms of both flow field and aeroacoustics prediction [17].In the present study, LES simulations are performed for a turbulent flow along a cavity at low Mach number and validated with available experimental data.…”

“…The time-varying pressure change '7' is fed by the vortex and reverse flow regions, which break away from the front wall and gives rise to acoustic pressure propagation '8'. open cavity [8] The noise spectra are dominated by multiple fluctuations created by pressure distribution with periodic character in most cases, and these fluctuations are followed by the harmonics of the sound pressure level caused by random components with very high time dependence. These fluctuations are called resonance frequencies or cavity tones.…”

“…They showed that the flow control with cylinder is effective in reducing the acoustic energy [15]. [8]. In 2017, Zafer and Konan studied the effect of cavityairfoil interaction with passive control on the acoustic signal.…”