| Airframe noise prediction is a major area of research in aeroacoustics at present. The major noise sources from airframe are flaps, leading edge slats, clean wing, tail surfaces and landing gear. In this paper, we mainly investigate trailing edge noise of the clean wing which is one of the most important airframe noise sources on an aircraft flying. Lighthill's Acoustic Analogy was identified as the most prominent analytical basis for current approaches to airframe noise research. Ffowcs-Williams and Hall were the first to solve the problem of noise radiated from the turbulent flow past a semi-infinite plate of zero thickness at zero angle of attack using this analogy.In this paper, the modeling approach includes a theoretical trailing edge noise prediction and utilizes RANS code with Menter's SST k- ω turbulence model to obtain the characteristic velocity and length scales. The characteristic velocity and length scales obtained from the CFD results are used in the noise model. The acoustic results are compared with seven test cases that were selected from a two-dimensional NACA 0012 experimental data and the results of Serhat Hosder's paper, and show reasonable good agreements. Some examples with two symmetric airfoils, two supercritical airfoils, EET wing and wing body configuration demonstrated the effect of the wing geometry, airfoil trailing edge shape and the lift coefficient on the trailing edge noise. |
