Turbofan engine jet flow noise real-time calculation and prediction method based on agent model

Abstract

The invention relates to a turbofan engine jet flow noise real-time calculation and prediction method based on an agent model, and the method comprises: simplifying a general noise model through employing the jet flow structure characteristics of a turbofan engine, and constructing an agent model structure of the turbofan engine jet flow noise; constructing a turbofan engine jet flow field finiteelement model, simulating an orthogonal test and obtaining a noise sample; solving the agent model by using the noise sample data; and correcting the noise model by using atmospheric conditions, flight speed and nozzle geometric dimension to finally obtain a jet flow noise real-time model with certain precision. According to the method, the problems that in the aero-engine jet flow noise numericalcalculation process, a traditional calculation fluid dynamics method is large in calculation amount, the noise condition in the whole flight process cannot be covered, and the real-time simulation requirement cannot be met are solved, and a basis is provided for turbofan engine active noise control.

Description

technical field [0001] The invention is a proxy model-based real-time calculation and prediction method for turbofan engine jet flow noise, which belongs to the technical field of aero-engine modeling and simulation. Background technique [0002] Aircraft noise radiation is a mandatory standard for airworthiness certification of civil aircraft. The number of airports in various countries that restrict noise is also increasing year by year. Therefore, aircraft noise design technology has become one of the main competitive chips for large transport aircraft, affecting its domestic and overseas markets. operation. The noise radiation of turbofan engines with high bypass ratio widely used in civil transport aircraft is the main cause of aircraft noise. 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...

AI Technical Summary

Problems solved by technology

[0004] The present invention proposes a real-time calculation and prediction method of jet flow noise of a turbofan engine based on a surrogate model. To meet the real-time simulation requirements and other problems, by using the characteristics of turbofan engine jet flow, the general jet flow noise calculation method is simplified and improved, and a turbofan engine jet flow noise model that meets the real-time simulation requirements is proposed, which can Real-time simulation calculation of flow noise and prediction of noise with engine performance parameters

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