...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Combustion Science and Technology >EFFECTS OF SECONDARY AIR ON GLOBAL HYDROCARBON CONSUMPTION RATES IN ENGINE EXHAUST GAS
【24h】

EFFECTS OF SECONDARY AIR ON GLOBAL HYDROCARBON CONSUMPTION RATES IN ENGINE EXHAUST GAS

机译：二次空气对发动机排气中全球碳氢消耗率的影响

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 temperature required to obtain total hydrocarbon consumption within the exhaust port and manifold of an engine, which is operated with secondary air dilution during a cold-start, were computationally investigated using detailed chemistry and thermodynamic properties. Constant pressure calculations were carried out over ranges of equivalence ratio and dilution levels representative of an engine cold-start. The calculations were performed using both iso-octane and n-heptane as surrogate fuels. It was found that the temperature required to obtain total hydrocarbon consumption on a 100 ms timescale is in the 950 to 1000K range for all pressures, secondary air dilution levels, and fuel types investigated. The dilution levels should be such that the overall O_2/HC ratio in the exhaust gas is greater than 2 in order to achieve HC consumption at the lowest possible temperature. Thus, the biggest challenge for secondary air systems is being able to mix the air with the exhaust gas without decreasing the gas temperature below these critical conditions.
机译：使用详细的化学性质和热力学性质，通过计算研究了获得发动机排气口和歧管内总碳氢化合物消耗所需的温度，该温度在冷启动期间通过二次空气稀释运行。在表示发动机冷启动的当量比和稀释水平的范围内进行恒压计算。使用异辛烷和正庚烷作为替代燃料进行计算。已经发现，对于所有压力，二次空气稀释水平和所研究的燃料类型，在100毫秒的时间范围内获得总碳氢化合物消耗所需的温度在950至1000K范围内。稀释水平应使废气中的总O_2 / HC比大于2，以便在尽可能低的温度下实现HC消耗。因此，二次空气系统的最大挑战是如何在不将气体温度降低到这些临界条件以下的情况下将空气与废气混合。

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