Real-time calculation and prediction method of turbofan engine jet noise based on surrogate model

A technology of turbofan engine and proxy model, which is applied in computing, computer-aided design, design optimization/simulation, etc. It can solve problems such as huge amount of calculation, unable to meet real-time simulation requirements, unable to cover noise conditions, etc., and achieve great application prospects. Effect

Active Publication Date: 2022-05-31
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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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

Method used

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  • Real-time calculation and prediction method of turbofan engine jet noise based on surrogate model
  • Real-time calculation and prediction method of turbofan engine jet noise based on surrogate model
  • Real-time calculation and prediction method of turbofan engine jet noise based on surrogate model

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Embodiment 1

[0088] Step 1.1) analyzes and simplifies the general jet noise:

[0090]

[0092]

[0094]

[0096] Step 1.2) Build an outer ring shear blending noise proxy model:

[0098]

[0101]

[0103]

[0105]

[0106] The geometric parameters used in the formula are shown in Figure 4.

[0107] Step 1.3) Calculate the inner ring shear mixing noise:

[0109]

[0110]

[0112]

[0113] Step 1.4) Fully Admixed Region Noise:

[0115]

[0116]

[0118]

[0119] Step 1.5) Coccyx separation noise:

[0121]

[0122]

[0123] Step 1.6) Total Output Noise:

[0125]

[0126] Step 2) establish a jet finite element model to obtain noise sample data:

[0129] Using the noise samples of each region obtained in step (2), the proxy model of the jet noise obtained in step (1)

[0131] Step 4.1) The correction of the jet velocity requires that on the absolute velocity of the jet flow velocity, plus the flight speed and the flight speed

[0132]

[0134]

[0136]

[0138] Step 4.2) For the correction of the engi...

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Abstract

The invention relates to a method for real-time calculation and prediction of jet flow noise of a turbofan engine based on a proxy model. ;Construct the finite element model of turbofan engine jet flow field, simulate the orthogonal test and obtain noise samples; use the noise sample data to solve the proxy model; use the atmospheric conditions, flight speed and nozzle geometry to correct the noise model, and finally get the A real-time model of jet noise with certain accuracy. The invention solves the problems that the traditional computational fluid dynamics method has a huge amount of calculation, cannot cover the noise conditions in the entire flight process, and cannot meet the real-time simulation requirements in the numerical calculation process of the jet flow noise of the aero-engine. basis for control.

Description

Real-time calculation and prediction method of jet noise of turbofan engine based on surrogate model technical field The present invention is a kind of real-time calculation and prediction method of turbofan engine jet noise based on proxy model, belongs to aviation Air engine modeling and simulation technology field. Background technique Noise radiation of aircraft is a mandatory standard for airworthiness certification of civil aircraft, and the number of airports where noise is restricted by various countries The number of aircraft is also rising year by year, so the noise design technology of aircraft has become one of the main competitive chips for large transport aircraft. affect its operations in domestic and overseas markets. The noise radiation of the large bypass ratio turbofan engine widely used in civil transport aircraft is the most important factor in the main cause of machine noise. The noise of turbofan engine can be divided into jet noise, fan nois...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23G06F119/10
CPCY02T90/00
Inventor 赵晓春黄向华孙庆彪刘乔王圣超孙越
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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