E-postama gönder PASSIVE AND ACTIVE CONTROL OF ACOUSTIC RESONANCE IN CAVITY FLOWS USING FFOWCS-WILLIAMS-HAWKINGS EQUATIONS
Öz
PASSIVE AND ACTIVE CONTROL OF ACOUSTIC RESONANCE IN CAVITY FLOWS USING FFOWCS-WILLIAMS-HAWKINGS EQUATIONS
Abstract
In the aerospace industry, interior storage carriages, that carry items such as weapons and bombs form cavities. The turbulence-cavity interaction causes significant vibration, sound pressure levels, resonance, and structural problems. Therefore, control methods are can be useful to reduce drag, minimize pressure fluctuations and SPL levels. This work studies the passive flow control methods to reduce the noise induced by the flow over the cavity. For this purpose, cavity leading, and trailing edge wall modifications were made such as inclination, placing a block upstream of the cavity, blowing from the cavity walls. Broadband nature of the noise sources is captured generally with DNS or LES approach. Large Eddy Simulations (LES) is used to compute the flow field to reduce computational cost. ANSYS Fluent software is utilized to solve compressible, two-dimensional, transient subsonic cavity flow. For the determination of sound pressure levels, Ffowcs-Williams–Hawkings (FW-H) integral method is used.
Keywords: Passive and Active control, compressible flow, Ffowcs-Williams–Hawkings equations, CFD, Aeroacoustics
KAVİTE BÖLGELERİNDEKİ AKUSTİK REZONANS KONTROLÜ İÇİN AKTİF VE PASİF KONTROL METODLARININ FFOWCS-WILLIAMS-HAWKINGS DENKLEMLERİ YARDIMI İLE İNCELENMESİ
Özet
Havacılık endüstrisinde uçakların mühimmat depolayan bölümleri kavite olarak adlandırılmaktadır. Kavite bölgesinde, türbülans-kavite etkileşimi önemli ölçekte titreşime, yüksek ses basınç seviyelerine, rezonansa ve yapısal problemlere sebep olmaktadır. Bu sebeplerden ötürü, kavite bölgelerinde meydana gelen basınç salınımını minimize etmek, sürtünme kat sayısını ve ses basınç seviyelerini (SPL) düşürmek amacı ile kontrol metodları geliştirilmekttedir. Bu çalışmada, kavite giriş ve çıkış duvarlarında geometrik modifikasyonlar yaratarak pasif, kavite duvarlarından hava üflemesi yaparak ise aktif akış kontrol yöntemleri geliştirilmiştir. Akış alanını çözümlemek için LES yaklaşımı kullanılmıştır. Sıkıştırılabilir, iki boyutlu,zamana bağlı değişen ve türbülanslı kaviye akışı ANSYS Fluent programı kullanılarak modellenmiştir. Ses seviyelerinin belirlenmesi için ise Ffowcs-Williams–Hawkings (FW-H) integral metodu kullanılmıştır.
Anahtar Kelimeler: Pasif ve aktif kontrol, sıkıştırılabilir akış, Ffowcs-Williams–Hawkings (FW-H) denklemleri, HAD, aeroakustik
Anahtar Kelimeler
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