Aeroacoustic Investigation of Flow over the Diamond, Cropped and Cranked Arrow Delta Wings Using Large Eddy Simulation Approach

The objective of this paper is to obtain acoustical behavior of air flow around 65° sweep back cropped, 66°/42° cranked arrow and 53° diamond delta wing configuration by using large eddy simulation approach with 0.17 of smagorinsky-lilli coefficient. It is worthy to mention that the root chord of the wings is 360 mm. Validation of the aerodynamics coefficient is performed using available experimental results which showed good agreements. CFD simulations were performed for 15 degree angles of attack at a Mach number of 0.147 and a Reynolds number of 1.2 million based on the root chord. Acoustic measurements such as power spectral density, acoustic pressure, sound pressure level and sound amplitude, were taken using 3 microphones in the wake region of the mentioned wings. The amount of sound pressure level of microphone which is placed at 1.835 meter from apex of above wings in the range of Strouhal 0 to 1 is, 22 to 66, 10 to 73 and 9 to 44 which indicates aeroacoustic behavior of the diamond delta wing, is more better than cropped and cranked arrow delta wing.