Experimental Study on Evaporation and Micro-Explosion Characteristics of Ternary Blended Droplets of Methanol, HCB and n-Octanol

doi:10.7652/xjtuxb202201003

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Experimental Study on Evaporation and Micro-Explosion Characteristics of Ternary Blended Droplets of Methanol, HCB and n-Octanol

更新时间：2025-05-08

- Experimental Study on Evaporation and Micro-Explosion Characteristics of Ternary Blended Droplets of Methanol, HCB and n-Octanol
- Vol. 56, Issue 1, Pages: 22-30+119(2022)
- 作者机构：
  
  江苏大学能源与动力工程学院,江苏,镇江,212013
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202201003
  CLC： TK421.2
- Online First：10 January 2022，
  
  Published：2022
- 稿件说明：
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Experimental Study on Evaporation and Micro-Explosion Characteristics of Ternary Blended Droplets of Methanol, HCB and n-Octanol[J]. 2022, 56(1): 22-30+119.
DOI：

Experimental Study on Evaporation and Micro-Explosion Characteristics of Ternary Blended Droplets of Methanol, HCB and n-Octanol[J]. 2022, 56(1): 22-30+119. DOI： 10.7652/xjtuxb202201003.

摘要

为了研究理化特性强烈互补的甲醇/加氢催化生物柴油(HCB)混合燃料的单液滴蒸发微爆特性

本文针对纯加氢催化生物柴油M0以及两种不同甲醇体积比的三元混合燃油M15(15%甲醇、17%辛醇和68%HCB)和M25(25%甲醇、17%辛醇和58%HCB)在不同环境温度下进行了详细的试验研究。首先

通过微观几何形态和热重试验对混合燃油的理化属性进行了分析。然后

在一个恒温加热炉中采用挂滴法结合高速显微成像技术

获得了液滴在蒸发过程中的形态、平方直径和气泡比等蒸发特性。研究得出:随着甲醇含量增加

混合燃油中分散相液滴粒径增大、数目增多

蒸发速率加快; 随着甲醇比例的增加

混合燃油液滴内部出现更加剧烈的醇相气泡膨胀并发生微爆现象

且微爆后喷射出的子液滴粒径大大提高

显著缩短了母液滴的寿命; 随着环境温度的增加

微爆频率增加

更显著地加快了液滴的蒸发速率。本文结果将对甲醇/HCB混合燃料喷雾燃烧特性以及该混合燃料的发动机适用性研究提供理论参考。

Abstract

In order to investigate the evaporation and micro-explosion characteristics of methanol/HCB

which present strong complementary physicochemical properties

an experimental study on the evaporation process of pure hydrogenated catalytic biodiesel(HCB)

denoted as M0

and two ternary blends

denoted as M15(15% methanol

17% n-octanol and 68% HCB)and M25(25% methanol

17% n-octanol and 58% HCB)

was carried out at different temperatures. The measurement of microscopic morphology and the thermogravimetry on the blends was performed to analyze the physicochemical properties of the fuels. After that

the evaporation characteristics of droplet morphology

square diameter and bubble rate of all tested fuels were obtained in a constant-temperature chamber by means of high-speed microscopic imaging. It was found that the droplet size and the number of the dispersion phase increased with methanol percentage

and the evaporation rate also increased. In addition

higher percentage of methanol would result in more intense micro-explosion and bigger ejected sub-droplets.The frequency of micro-explosion phenomena increased with ambient temperature

which would consequently accelerate the evaporation rate of the droplets. This work provides a theoretical reference for the following study on spray and combustion characteristics of methanol/HCB blends in internal combustion engines

as well as their applicability.

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