Rotor noise determination method and system

Abstract

The invention relates to a rotor noise determination method and system. The method comprises the following steps: acquiring a rotor characteristic profile contour; generating a three-dimensional gridaccording to the rotor characteristic profile contour, wherein the rotor three-dimensional grid comprises a rotor three-dimensional airfoil grid and a background grid; solving the fluid control equation corresponding to each grid in the three-dimensional grids to obtain a rotor flow field, wherein the rotor flow field comprises the pressure around the rotor, the fluid density, the speed of the fluid in the x direction, the speed of the fluid in the y direction and the speed of the fluid in the z direction, and the x direction, the y direction and the z direction are perpendicular to one another; constructing a sound source according to the disturbance of each parameter in the rotor flow field; acquiring a sound source propagation model, wherein the sound source propagation model is a linear Euler equation; and solving the sound source propagation model by adopting an intermittent Galerkin method to obtain the noise distribution of the space around the rotor. According to the invention,the calculation accuracy of the rotor noise can be improved.

Description

technical field [0001] The invention relates to the field of rotor noise, in particular to a method and system for determining rotor noise. Background technique [0002] Rotor noise is the main noise source of helicopters. In the military field, serious rotor noise sources are likely to expose the flight trajectory of the helicopter in advance and increase the hit probability of ground firepower; in the civilian field, severe noise will affect the comfort of passengers. Sex, but also interfere with the normal life of the ground residents. Therefore, reducing the noise of the rotor is not only a military requirement, but also an important problem that needs to be solved urgently in the popularization and application of helicopters. [0003] The premise of noise reduction is to understand the noise. At present, the calculation of rotor noise is mainly based on the FW-H acoustic analogy equation. The FW-H equation is suitable for engineering research and has been widely used ...

AI Technical Summary

Problems solved by technology

The FW-H equation is suitable for engineering research and has been widely used at home and abroad. However, in the calculation of noise, the FW-H equation ignores the interference effect of the complex flow field of the rotor on the noise propagation, and the correlation between the rotor flow / acoustic interference The research is still in the initial stage, and there is no substantial high-efficiency calculation method. Therefore, the accuracy of the noise information determined by the existing rotor noise determination method is low

Images