Performance Calculation and Improvement of Aircraft Engine Lubricating Oil Heat Diffusion Ejector Based on CFD Analysis

Abstract

The lubricating oil heat diffusion ejector of a certain aircraft engine under the condition of engine idling on ground in the hot weather has the problem of low lubricating oil temperature drop after its turning on. The flow process of cool-side air flue of lubricating oil heat diffusion system is analyzed, and the ejector performance analysis method under severe conditions is explored. Based on N-S equations and k-ε turbulence model, the ejector performance is calculated and verified by test, and the lubricating oil temperature drop values before/after ejector turning on under severe conditions are obtained. The improvement scheme of ejector performance available in engineering is proposed on the basis of numerical calculation results. The results of the on-board ground test show that the calculation method is reasonable, and numerical simulation results are consistent with the test results, which meets the requirements of general engineering calculations, and provides a theoretical method for the performance analysis of an ejector.

Keywords

• lubricating oil heat diffusion system
• ejector
• n-s equations
• performance
• improvement