ÜFLEMELİ KONTROL SİSTEMİNE SAHİP KANAT KESİTİNİN AEROAKUSTİK İNCELENMESİ

Öz

Bu araştırmada, jet üflemeli bir kanat kesitinin hesaplamalı aeroakustik analizi yapılmıştır. Kanat kesit şekli NACA0015 olarak seçilmiştir. Kanatın üst yüzeyinde jet üfleme mekanizması bulunmaktadır. Hesaplamalar sonlu hacim çözücü ticari yazılım programı kullanılarak yapılmıştır. Türbülans modellemesinde k-ε modeli kullanılmıştır ve akustik sinyalin belirlenmesinde Ffowcs Williams-Hawking akustik analoji modeli kullanılmıştır. Jet üflemesi olmaksızın hesaplanan Ses Basınç Seviyeleri, deneysel verilerle karşılaştırılmış ve iyi bir uyum gözlemlenmiştir. Jet üflemeli durumlarda, jet çıkış açılarının, jet çıkış hızı oranlarının ve hücum açısının kanat üzerine etkisi incelenmiştir ve jet üflemesi olmayan durumlar ile karşılaştırılmıştır.

Anahtar Kelimeler

• Aeroakustik,Jet Üfleme; Hesaplamalı Akışkan Dinamiği

Investigation of Airfoil Aeroacoustics with Blowing Control Mechanism

Öz

In this investigation, it is dealt with computational aero-acoustic analysis of an airfoil with jet blowing. The airfoil shape is selected as NACA0015 profile with jet blowing on upper surface. The calculations of analysis are done by using commercial finite volume solver. The k-ε turbulence model is used for the turbulence modeling and the Ffowcs Williams and Hawking acoustic analogy model is run for determination of acoustic data. The numerical results are compared with experimental data for computed Sound Pressure Level without jet blowing and well agreement is observed. In the case of jet blowing, the effects of different jet angle, velocity ratio and angle of attack on airfoil are investigated and noise levels of non jet cases and jet blowing cases are studied.

Anahtar Kelimeler

• Aeroacoustics,Jet Blowing; Computational Fluid Dynamics

Kaynakça

1. Brooks, T., Pope, D. Marcolini, M. (1989). “Airfoil Self-Noise and Prediction”, NASA Reference Publication 1218
2. Buchmann N. A., Atkinson C., and Soria J. (2013), “Influence of ZNMF jet flow control on the spatio-temporal flow structure over a NACA-0015 airfoil,” Exp. Fluids 54, 1–14, doi:10.1007/s00348-013-1485-7.
3. Cattafesta III L.N. ve Sheplak M. (2011), “Actuators for active flow control,” Annu. Rev. Fluid Mech. 43, 247–272, doi: 10.1146/annurev-fluid-122109-160634.
4. Ffowcs Williams, J. E. and Hawkings, D. L. (1969). “Sound Generation by Turbulence and Surfaces in Arbitrary Motion.” Roy Soc London-Philosophical Trans Ser A, vol. 264: 321-342, doi: 10.1098/rsta.1969.0031..
5. FLUENT Theory Guide14.0, 2011.
6. Goodarzi, M., Rahimi, M. and Fereidouni, R. (2012). “Investigation of Active Flow Control over NACA0015 Airfoil Via Blowing”, International Journal of Aerospace Sciences 2012, 1(4): 57-63, doi: 10.5923/j.aerospace.20120104.01.
7. Gross A. and Fasel H.F. (2010), “Active flow control for NACA 6-series airfoil at Re = 64.200,” AIAA J. 48, 1889–1902, doi: 10.2514/1.J050051 .
8. Kryter, Karl D. (1994). “The handbook of hearing and the effects of noise: physiology, psychology, and public health.” Boston: Academic Press. ISBN 0-12-427455-2

9. Lighthill, M. (1952). “On sound generated aerodynamically I. General theory”, Proc. R. Soc. Lond. A 211: 564-587, doi: 10.1098/rspa.1952.0060.
10. Lockard, D.P. and Lilley, G.M. (2004). “The Airframe Noise Reduction Challenge.” NASA Technical Memorandum, NASA/TM-2004-213013.
11. Moleswortha, B.R.C. and Burgess, M., (2013), “Improving intelligibility at a safety critical point: In flight cabin safety”, Safety Science, 51, 11-16, doi: 10.1016/j.ssci.2012.06.006
12. Özkurt N., Sarı D., Akdağ A., Kütükoğlu M., ve Gürsarslan A., (2014), “Modeling of noise pollution and estimated human exposure around İstanbul Atatürk Airport in Turkey”, Science of the Total Environment, doi: 10.1016/j.scitotenv.2013.08.017.
13. Packard N. O., Thake M. P. Jr., Bonilla C. H.(2013), Gompertz K., ve Bons J. P., “Active control of flow separation on a laminar airfoil,” AIAA J. 51, 1032–1041, doi: 10.2514/1.J051556.
14. Picard M., Girard S.A., Simard M., Larocque R., Leroux T., ve Turcotte F., (2008), “Association of work-related accidents with noise exposure in the workplace and noise-induced hearing loss based on the experience of some 240,000 person-years of observation”, Accident Analysis and Prevention, doi: 10.1016/j.app.2008.05.013
15. Postl D., Balzer W., and Fasel H.F. (2011), “Control of laminar separation using pulsed vortex generator jets: Direct numerical simulations,” J. Fluid Mech. 676, 81–109, doi: 10.1017/jfm.2011.34.
16. Vasile J.D. ve Amitay M. (2015), “Interaction of a finite-span synthetic jet near the tip of a sweptback wing”, Physics of Fluids 27, 067102, doi: 10.1063/1.4921844.
17. Wagner, C., Huttl, T. and Sagaut, P., (2007), “Large-Eddy-Simulation for Acoustics.” Cambridge University Press, UK.
18. Zhang W. ve Samtaney R. (2015), “A direct numerical simulation investigation of the synthetic jet frequency effects on separation control of low-Re flow past an airfoil”, Physics of Fluids 27, 055101, doi: 10.1063/1.4919599.