Effects of High-Octane Components on the Ignition Characteristics of N-Heptane

doi:10.7652/xjtuxb201811005

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Effects of High-Octane Components on the Ignition Characteristics of N-Heptane

更新时间：2025-07-09

- Effects of High-Octane Components on the Ignition Characteristics of N-Heptane
- Vol. 52, Issue 11, Pages: 30-36+80(2018)
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201811005
  CLC： TK42
- Online First：10 November 2018，
  
  Published：2018
- 稿件说明：
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Effects of High-Octane Components on the Ignition Characteristics of N-Heptane[J]. 2018, 52(11): 30-36+80.
DOI：

Effects of High-Octane Components on the Ignition Characteristics of N-Heptane[J]. 2018, 52(11): 30-36+80. DOI： 10.7652/xjtuxb201811005.

摘要

采用动力学模拟方法

研究了乙醇、异辛烷和甲苯这3种乙醇汽油中主要高辛烷值燃料组分的引入对正庚烷着火特性的动力学影响。研究结果表明:在初始温度高于1 000 K左右的高温条件下

3种高辛烷值燃料组分的引入对燃料着火滞燃期几乎没有影响; 在中低温条件下

高辛烷值组分的引入对燃料着火滞燃期影响显著。这是因为

低温条件下高辛烷值组分的引入对正庚烷氧化脱氢反应起到了抑制作用

进而影响了随后的低温链式反应

这种抑制作用使得正庚烷低温放热减弱、温度上升缓慢、着火向后延迟。在所研究的3种高辛烷值燃料中

乙醇抑制正庚烷着火的效果最显著

甲苯和异辛烷延迟正庚烷着火的效果相差不大

甲苯略微强于异辛烷。

Abstract

The kinetic effects of three different kinds of high-octane components in the ethanol-gasoline such as ethanol

isooctane and toluene on the ignition characteristics of n-heptane are studied with the method of kinetic simulation. Results show that when the initial temperature is more than 1 000 K

the introduction of three different kinds of high-octane fuels has almost no influence on the ignition delay of n-heptane; whereas the high-octane fuels has obvious influence on the ignition delay of n-heptane at low initial temperatures. This is due to the fact that the introduction of high octane fuel at low temperatures inhibits the oxidative dehydrogenation of n-heptane

and hence influencing the subsequent low temperature chain reaction. In this way

the heat release of n-heptane during the low temperature stage is reduced

and the temperature rises slowly

thus the ignition is delayed. Of the three kinds of high octane fuels studied in this paper

the ethanol shows the strongest effect on delaying the ignition of n-heptane fuel. The effects of toluene and isooctane on the ignition delay of n-heptane are almost the same

and toluene shows slightly stronger delaying effect than isooctane.

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references

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