Airplane tail jet flow atmospheric diffusion modeling method based on CFD (computational fluid dynamics)

Abstract

The invention relates to an airplane tail jet flow atmospheric diffusion modeling method based on CFD (computational fluid dynamics), which comprises the following sequential steps: building a fluid mechanics equation of tail jet flow multi-component airflow; carrying out mesh generation and boundary condition setting on a tail jet flow diffusion area; according to the size of a calculation area, carrying out Farve density weighted average on the above equation; after the pressure and the temperature of a flow field are distributed, the fluid density is calculated, and then, the next round of loop iteration is started; the engine tail jet flow parameter input is subjected to three-dimensional area analog computation; and the working condition account case of various airplanes are built to obtain a tail jet flow diffusion analog result of airplanes of different tail spraying model numbers under various atmosphere parameters and altitudes. According to the airplane tail jet flow atmospheric diffusion modeling method based on the CFD, the blank of the airplane tail jet flow on the aspects of long-distance and big-area diffusion numerical value analysis is made up, and a numerical value analysis basis is provided for the optimization design of an airplane tail nozzle and the analysis of a safe distance between a front airplane and a rear airplane in the airplane flying process so as to guarantee the flying safety of an aerospace engine.

Description

technical field [0001] The invention relates to the field of aerospace dynamics, in particular to a CFD-based atmospheric diffusion modeling method for aircraft tail jets. Background technique [0002] The current numerical research mainly focuses on the flow field near the nozzle outlet of the engine, and there is little research on the diffusion characteristics of the wake flow caused by the tail injection. Some people in China have numerically studied the supersonic flow field inside and outside the engine nozzle, and combined the flow field inside and outside the nozzle to calculate, but the calculation area is small; The model has been analyzed and calculated to provide design reference for infrared radiation detection; some people have studied the influence of turbulence pulsation on the tail jet flow field and the influence on infrared signal analysis; Field infrared radiation characteristics. In summary, there has not been any published research results on the nume...

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Problems solved by technology

[0002] The current numerical research mainly focuses on the flow field near the nozzle outlet of the engine, and there is little research on the diffusion characteristics of the wake flow caused by the tail injection.

Some people in China have numerically studied the supersonic flow field inside and outside the engine nozzle, and combined the flow field inside and outside the nozzle to calculate, but the calculation area is small; The model has been analyzed and calculated to provide design reference for infrared radiation detection; some people have studied the influence of turbulence pulsation on the tail jet flow field and the influence on infrared signal analysis; Field Infrared Radiation Characteristics

In summary, there has not been any published research results on the numerical analysis of aircraft jet flow, which cannot provide analysis results for the optimization design of aircraft engines and flight safety, and cannot solve the long-distance and large-scale diffusion characteristics of jet flow. ungraspable problem

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