A modeling method for an integrated real-time model of flight, propulsion system and jet noise

Abstract

The invention relates to a comprehensive real-time model modeling method of flight / propulsion system / jet flow noise, comprising: establishing a real-time prediction model of jet flow noise; establishing a component-level model of a turbofan engine with a large bypass ratio; establishing a dynamic model of a twin-engine transport aircraft and kinematic models; flight / engine / jet noise model synthesis and correction. The present invention aims at the problem that in the process of aircraft noise research and design, the traditional method usually separates the flight system, propulsion system and noise calculation, it is difficult to fully consider the coupling relationship between the systems, and the problem that the noise situation in the entire flight process cannot be covered, the calculation amount is huge, and it is impossible Real-time calculation of jet noise level based on flight and engine status, establishment of jet noise real-time prediction model, combined with flight model and engine nonlinear model, to achieve real-time simulation of flight status, engine performance and jet noise.

Description

technical field [0001] The invention relates to a comprehensive real-time model modeling method of flight, propulsion system and jet flow noise, which belongs to the technical field of aero-engine modeling and simulation. Background technique [0002] The noise of a turbofan engine can be divided into jet flow noise, fan noise, combustion chamber noise and turbine noise, among which the jet flow noise can be approximately regarded as proportional to the high-order power of the jet flow velocity. The flow noise will increase dramatically and is the most important noise source of the engine. Existing passive jet noise control technologies have limited potential and often have a negative impact on engine performance, while active control of jet far-field noise requires the establishment of a real-time simulation model of jet noise, and considering that jet noise is affected by It is of great significance to establish a comprehensive model of flight, propulsion system and jet f...

AI Technical Summary

Problems solved by technology

[0004] What the present invention proposes is a kind of comprehensive real-time modeling method of flight, propulsion system and jet flow noise. Real-time model modeling method, aiming at problems such as the huge amount of calculation in the traditional method in the engine noise design process, the inability to cover the noise conditions during the entire flight, and the failure to meet the real-time simulation requirements, a real-time prediction model of jet flow noise is established, and it is closely related to the engine noise. The combination of linear model and flight model realizes real-time simulation of engine jet noise using engine performance characteristic parameters and flight state parameters

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