Design method of low-noise propeller of aircraft and propeller configuration

Abstract

The invention provides a design method of a low-noise propeller of an aircraft. The design method comprises the following steps of S100, according to a preset basic blade shape of the propeller of the aircraft, performing CFD calculation, namely computational fluid dynamics calculation, so as to obtain lift coefficients and resistance coefficients corresponding to different Reynolds numbers and different attack angles of the blade shape; S200, according to the preset flow state of environmental gas, the preset geometric parameters of the propeller, the lift coefficients and the resistance coefficients, performing momentum blade element theoretical calculation, so as to obtain aerodynamic data of the propeller; S300, according to the preset geometric parameters of the propeller and the aerodynamic data of the propeller, performing FW-H aeroacoutics equation calculation, so as to obtain noise characteristic data of the propeller; and S400, transferring an optimization algorithm based on a simulating annealing thought, and circularly executing the steps from S200 to S300 until the noise characteristic data is converged so that the best geometric parameters of the propeller is obtained. According to the design method disclosed by the invention, the power problem and the noise problem of the propeller are taken into account at the same time, and noises of the aircraft during a flight are greatly reduced.

Description

[0001] This case is a divisional application based on the patent application with application number 201510280181.2 and titled "A Design Method for Low-Noise Aircraft Propeller". technical field [0002] The invention relates to the field of aircraft, in particular to a design method for a low-noise aircraft propeller. Background technique [0003] The propeller design of the small quadrotor aircraft in the prior art is mainly based on two considerations: first, the lift-drag characteristics of the designed propeller should meet the requirements of the quadrotor aircraft's load, maneuverability and motor power; second, the premise of ensuring the aerodynamic characteristics Reduce the working noise of the propeller as much as possible. [0004] At present, most of the existing propeller designs in the domestic and foreign markets adopt the highest efficiency design method, but do not consider the noise level enough, and most of them provide pulling or thrust for conventional...

AI Technical Summary

Problems solved by technology

However, there is still no design method that can reduce noise specifically for the propeller of the aircraft, and the computational fluid dynamics (Computational Fluid Dynamics, CFD) method generally used in order to obtain the aerodynamic and noise characteristics of the propeller in the prior art, although it can be very A good combination of computer hardware computing power and mathematical numerical calculation methods to solve fluid dynamics problems, and with the rapid development of computational fluid dynamics (CFD method), the solution results are more accurate

However, the time overhead is unacceptable, especially with the continuous optimization and development of the propeller, it is necessary to quickly obtain the start-up and noise characteristics of the propeller, and the aerodynamic and noise characteristics obtained by the CFD method cannot meet people's needs. Therefore, it is necessary to provide a method that can shorten the solution cycle of the aerodynamic and noise characteristics of the aircraft, and can reduce the propeller noise of the aircraft according to the solution results

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