运动油滴/固体壁面斜碰撞的状态辨识及特征分析

doi:10.7527/S1000-6893.2014.0134

Abstract

Abstract:

Analysis of oil/air two-phase flow and heat transfer in bearing chamber are important fundamental work for the lubrication and heat transfer design of aeroengine bearing chamber, while state identification and characteristics analysis of oil droplet's oblique impact onto solid wall are the main parts for oil/air two-phase flow and heat transfer study. In this paper, the numerical model of oil droplet's oblique impact onto solid wall is established with volume of fluid (VOF) method and the numerical simulation of oil droplet impingement state is carried out, and then the effects of oil droplet diameter, incident angle, impact velocity on the deposited oil film spreading length, oil film thickness and splashing droplets number are discussed particularly, the criterion used for classify impingement state of oil droplet oblique impingement is proposed, and its rationality is verified by physical testing work of others. The results show that as the incident angle decreases, the deposited oil film spreading length and oil film thickness increase, whereas the number of splashing droplets reduces; as the impact velocity and oil droplet diameter increase, the deposited oil film spreading length and the splashing droplets number increase, but the oil film thickness decreasing trend corresponds to the former and the increasing trend corresponds to the latter.

Key words: aeroengine, bearing chamber, oil droplet, oblique impact, numerical simulation, criterion

CLC Number:

V233.4

LIU Deng, CHEN Guoding, FANG Long, SUN Hengchao. State identification and characteristics analysis of oil droplet's oblique impact onto solid wall[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015, 36(4): 1359-1366.

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State identification and characteristics analysis of oil droplet's oblique impact onto solid wall

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