The Noise Numerical Simulation of Two Dimensional Clark-Y Airfoil on a MALE UAV

The study was conducted with the aim of the values of the airfoil Clark-Y. Aeroacoustic acts as one of the solutions in ergonomics. The research was conducted with the aim of obtaining the maximum value and plot of Lp (sound pressure level) and Lw (sound power level). This study also considers the noise value based on the applicable quality standardsin Indonesia. The study process was carried out using computational methods on CFD. In CFD the turbulence method uses LES (Large Eddy Simulation) while the acoustics uses the FWH (Fowcs William and Hawking). The computational process produces a value of Lp (sound pressure level) which is then processed to obtain a value of Lw (sound power level). The results of the study found that the highest Lp (sound pressure level) was 92.3 dB and Lw (sound power level) was 123.075 at a frequency of 31.5 Hz in the parameters of the angle of attack of 20 deg and the speed of 19 m/s which is located occurs noise on receiver 1 airfoil Clark-Y. Based on the maximum value of Lp (sound power level) noise occurs in the unsafe stage because it exceeds the Lmax value limit on the reference value of the noise quality standard.