Flight/propulsion system/jet flow noise comprehensive real-time model modeling method

Abstract

The invention relates to a modeling method for a flight/propulsion system/jet flow noise comprehensive real-time model. The modeling method comprises the following steps: establishing a jet flow noisereal-time prediction model; establishing a component-level model of the turbofan engine with the large bypass ratio; establishing a kinetic model and a kinematics model of the double-engine transporter; and synthesizing and correcting a flight/engine/jet noise model. The invention discloses a noise reduction method for an aircraft. According to a traditional method, a flight system, a propulsionsystem and noise calculation are generally carried out separately; the inter-system coupling relationship is difficult to fully consider; the problem that the noise condition in the whole flight process cannot be covered is solved. According to the method, the problems that the calculation amount is large, and the jet flow noise cannot be calculated in real time according to flight and engine states are solved, a jet flow noise real-time prediction model is established and combined with a flight model and an engine nonlinear model, and real-time simulation of the flight state, the engine performance and the jet flow noise is achieved.

Description

Technical field [0001] The invention is a flight / propulsion system / jet noise integrated real-time model modeling method, belonging to the technical field of aeroengine modeling and simulation. Background technique [0002] The noise of a turbofan engine can be divided into jet noise, fan noise, combustion chamber noise, and turbine noise. The jet noise can be approximately regarded as proportional to the higher order of the jet velocity. The jet velocity increases as the jet velocity increases. The flow noise increases sharply and is the main noise source of the engine. Existing passive jet noise control technology has limited potential and often has a negative impact on engine performance. Active control of jet far-field noise requires the establishment of a real-time simulation model of jet noise, and considers the effects of jet noise. The effect of engine working status and flight status is very important to establish a comprehensive model of flight / propulsion system / jet noi...

AI Technical Summary

Problems solved by technology

[0004] The present invention proposes a comprehensive real-time model modeling method for flight / propulsion system / jet flow noise, and its purpose is to overcome the deficiencies in the prior art. 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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