Thermal compensation design method for high-temperature air pipeline

Abstract

Provided is a thermal compensation design method for a high-temperature air pipeline. The thermal compensation design method includes the steps of using UG NX commercial software under a mechanical pipeline layout module to build a pipeline geometric model containing seven types of mathematical variables, carrying out pre-processing through finite element analysis software ANSYS, material parameters are given according to GH536, wherein an elasticity modulus E is equal to 187 GPa, and poisson ratio mu is equal to 0.3, utilizing boundary conditions and imposed displacement boundary conditions and temperature field load, calculating and obtaining the stress conditions of the pipeline, adjusting pipeline layout paths, carrying out calculation again according to the second content to the fourth content, and obtaining a new calculation result, that is, the maximum stress value is smaller than yield limit of materials, and yield strength reserve factor is larger than 1.5, and therefore the design requirements are met. The thermal compensation design method has the advantages of improving design reasonability and ensuring that the high-temperature air pipeline meets the requirements of engines for long service life and high reliability.

Description

technical field [0001] The invention relates to the field of design of external pipelines of aero-engines, in particular to a thermal compensation design method of high-temperature air pipelines. Background technique [0002] From domestic and foreign aircraft and aero-engine failure statistics, the failures caused by external pipeline failures and accessories account for more than half of the total failures, ranking first among structural failures. It can be seen that the reliable design of external pipelines has a great impact on flight safety. very important. [0003] The external air pipeline in the high-temperature area of ​​the engine bears the aerodynamic load and the combined effect of alternating stress caused by temperature changes and engine vibration during work. , resulting in fatigue damage. The thermal stress at the rigid fixing point of the pipeline caused by the temperature change and the linear expansion of the casing will increase the stress concentratio...

AI Technical Summary

Problems solved by technology

[0005] 1. Insufficient thermal compensation capability

It affects the life of the pipeline, cannot meet the requirements of the engine, and even affects the safety of the engine;

[0006] 2. Excessive thermal compensation capacity

The structural design adopts the elastic deformation of the pipeline itself for thermal compensation. Excessive compensation capacity will increase the unnecessary weight of the pipeline, occupy too much space, and affect the layout of other accessories, pipelines and cables around it; at the same time, the loss of medium flow resistance in the pipeline It will also increase accordingly, which will affect the performance of the engine

[0007] At present, no one has proposed the design method of using the elastic deformation of the pipeline itself for thermal compensation.

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