• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Homogeneous charge compression ignition engines, 2009 >Investigations into the Effects of Thermal and Compositional Stratification on HCCI Combustion - Part Ⅱ: Optical Engine Results
【24h】

Investigations into the Effects of Thermal and Compositional Stratification on HCCI Combustion - Part Ⅱ: Optical Engine Results

机译：热和成分分层对HCCI燃烧的影响研究-第二部分：光学引擎结果

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

The effect that thermally and compositionally stratified flowfields have on the spatial progression of iso-octanefueled homogeneous charge compression ignition (HCCI) combustion were directly observed using highspeed chemiluminescence imaging. The stratified incylinder conditions were produced by independently feeding the intake valves of a four-valve engine with thermally and compositionally different mixtures of air, vaporized fuel, and argon. Results obtained under homogeneous conditions, acquired for comparison to stratified operation, showed a small natural progression of the combustion from the intake side to the exhaust side of the engine, a presumed result of natural thermal stratification created from heat transfer between the in-cylinder gases and the cylinder walls. Large differences in the spatial progression of the HCCI combustion were observed under stratified operating conditions. Qualitative observations of the manner in which the combustion proceeded indicated that ±20 ℃ temperature stratification, ±15% fuel concentration stratification, and ±5 air-fuel ratio stratification all similarly affected the combustion progression, with the combustion proceeding, in general, from high to low temperature, high to low fuel concentration, or high to low air-fuel ratio. Concurrent and opposite stratification of these parameters were often present and mitigated the effects that the stratified flowfields had on the manner in which the combustion progressed spatially. The possibility of using the thermal and compositional stratification studied herein for HCCI combustion control was evaluated in a hypothetical recompression-type engine. The magnitude of stratification that could be maintained until combustion commenced was estimated to be small, and competing effects were often present, likely limiting the effects the stratification could have on the combustion.
机译：使用高速化学发光成像直接观察到热分层和成分分层流场对异辛烷燃料均质充量压缩点火（HCCI）燃烧的空间进程的影响。通过向四气门发动机的进气门分别供热，成分不同的空气，汽化燃料和氩气混合物，可以产生分层的气缸条件。与分层运行相比，在均质条件下获得的结果表明，燃烧从发动机进气侧到排气侧的燃烧自然变化很小，这是缸内气体之间的热传递产生的自然热分层的推测结果和气缸壁。在分层运行条件下，HCCI燃烧的空间进程存在较大差异。对燃烧进行方式的定性观察表明，±20℃的温度分层，±15％的燃料浓度分层和±5的空燃比分层均类似地影响燃烧进程，一般而言，燃烧过程是从高温开始的。温度过低，燃油浓度从高到低或空燃比从高到低。这些参数经常同时存在和相反地分层，并减轻了分层流场对燃烧空间进行方式的影响。在假设的再压缩型发动机中评估了本文研究的热分层和成分分层用于HCCI燃烧控制的可能性。据估计，直到燃烧开始之前可以保持的分层程度很小，并且经常会出现竞争效应，这很可能限制了分层对燃烧的影响。

著录项

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