环境温度对掺水乳化柴油蒸发的影响研究  

Effect of Ambient Temperature on the Evaporation Characteristics of Water-in-oil Emulsified Diesel Droplets

作　　者：王兆文[1] 曹俊辉 袁波 王宇洲 成晓北[1] WANG Zhaowen;CAO Junhui;YUAN Bo;WANG Yuzhou;CHENG Xiaobei(School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学能源与动力工程学院,武汉430074

出　　处：《工程热物理学报》2022年第8期2256-2266,共11页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51576083)。

摘　　要：本文采用挂滴法研究了掺水质量分数30%(W30)的乳化柴油单液滴在573 K、673 K、773 K和873 K下的蒸发特性。结果表明,随着环境温度升高,归一化平方直径先增加后减小,首次微爆时刻逐渐小于进入准稳态时刻,而微爆频率先减小后增加,其微爆强度也先减小后增加,773 K是转捩点温度。本文还发现随着环境温度的升高,液滴气泡成核从单位点成核逐渐演变为多位点成核,并导致了大气泡形成过程从与强微爆过程重合过渡到与弱微爆过程重合,最终与强微爆和弱微爆过程分离。In this paper, the evaporation characteristics of single droplets of W30 water-in-oil emulsified diesel at 573 K, 673 K, 773 K and 873 K were investigated using the droplet suspension method.The results show that as the ambient temperature increases, the normalized squared diameter increases and then decreases, the first micro-explosion moment is gradually smaller than the moment of entering the quasi-steady state. The micro-explosion frequency decreases and then increases, and its micro-explosion intensity also decreases and then increases. This paper also proposes a new multi-component fuel droplet micro-explosion mechanism: as the ambient temperature increases,droplet bubble nucleation gradually evolves from single-point nucleation to multi-point nucleation,which leads to the transition of the large bubble formation process from coinciding with the strong micro-explosion process to coinciding with the weak micro-explosion process, and finally separating from the strong and weak micro-explosion processes.

关 键 词：掺水乳化柴油 单液滴 蒸发 微爆 气泡成核 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]