• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Heat and Mass Transfer >A single n-heptane droplet behavior in rapid compression machine
【24h】

A single n-heptane droplet behavior in rapid compression machine

机译：快速压缩机中单个正庚烷液滴的行为

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This study investigated the evaporation characteristics of a single n-heptane droplet inside a rapid compression machine (RCM). The RCM is an experimental apparatus used to simulate a single compression stroke of an internal combustion engine to observe the combustion phenomena in homogeneous charge compression ignition (HCCI) environments. During the compression stroke, the temperature inside the RCM increases and the fuel droplet evaporates under unsteady conditions. In this study, a single n-heptane droplet was placed at the center of the reaction chamber. The droplet was suspended from the tip of a fine thermocouple (50 μm), and the transient bulk temperature of the droplet was measured. The evaporation process was recorded by a high-speed charge-coupled device (CCD) camera with a frame rate of 500 frames per second. The initial droplet diameter (450-700 μm) operation time (170 ms and 210 ms), and the compression ratio (14 and 18) were set as experimental parameters. To observe the pure evaporation of the droplet, the reaction chamber was filled with N_2 gas. Experimental results showed that the droplet diameter decreased with the constant evaporation rate during the evaporation process, even under time-varying temperature and pressure surrounding the droplet. The evaporation rate of the droplet rose as the diameter of the droplet increased, due to the differences in droplet heat capacity. As the compression rate increased, temperature inside the reaction chamber increased and increase in droplet evaporation rate was observed. The operation time did not appear to affect the droplet's evaporation rate.
机译：这项研究调查了快速压缩机（RCM）中单个正庚烷液滴的蒸发特性。 RCM是用于模拟内燃机的单个压缩冲程以观察均质充量压缩点火（HCCI）环境中的燃烧现象的实验设备。在压缩冲程期间，RCM内部的温度升高，并且燃料滴在不稳定的条件下蒸发。在这项研究中，单个正庚烷液滴被放置在反应室的中心。将液滴从细热电偶（50μm）的尖端悬起，并测量液滴的瞬时总体温度。蒸发过程由高速电荷耦合器件（CCD）相机以每秒500帧的帧速率记录。将初始液滴直径（450-700μm）操作时间（170 ms和210 ms）以及压缩比（14和18）设置为实验参数。为了观察液滴的纯蒸发，将N_2气体填充到反应室中。实验结果表明，即使在液滴周围的温度和压力随时间变化的情况下，液滴直径在蒸发过程中也随着恒定的蒸发速率而减小。由于液滴热容量的差异，液滴的蒸发速率随着液滴直径的增加而上升。随着压缩速率的增加，反应室内的温度升高，并且观察到液滴蒸发速率的增加。操作时间似乎并未影响液滴的蒸发速率。

著录项

  • 来源
  • 作者

    Hyemin Kim; Seung Wook Baek; Daejun Chang;

  • 作者单位

    Division of Aerospace Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon, Republic of Korea;

    Division of Aerospace Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon, Republic of Korea,Engineering bldg., Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea;

    Division of Ocean System Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon, Republic of Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Droplet; Evaporation; RCM; Temperature; Pressure; Unsteady condition;

    机译：水滴;蒸发;RCM;温度;压力;不稳定状态;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号