Numerical Simulation of on Two-Dimensional High Lift Device Noise by SNGR Method

Noise of high lift device accounts for much in the airframe noise at approach period of airliners. What makes the noise of high lift device hard to predict is the complex geometrical conffiguration and the intricate flow structure. Apart from the means of experimental and theoretical methods, numerical simulation is also a important process to study aero-acoustics. On the basis of the Stochastic Noise Generation and Radiation(SNGR), obtain the time-averaged flow field first, then construct the acoustic source term by stochastic model, and finally solve the acoustic perturbation equation using high-accuracy and low-dispersion time and spatial schemes. A whole noise prediction system based on SNGR method is built, adopting two-dimension high lift device model 30P30N to simulate the acoustic propagation process, and analyzing the Sound Pressure Level frequency spectrum of monitor, thus realizing the fast noise prediction of 2D high lift device and laying foundation for the aerodynamic and acoustic integral design of 2D high lift device.