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Title: Experimental study and chemical analysis of n-heptane homogeneous charge compression ignition combustion with port injection of reaction inhibitors

Abstract

The control of ignition timing in the homogeneous charge compression ignition (HCCI) of n-heptane by port injection of reaction inhibitors was studied in a single-cylinder engine. Four suppression additives, methanol, ethanol, isopropanol, and methyl tert-butyl ether (MTBE), were used in the experiments. The effectiveness of inhibition of HCCI combustion with various additives was compared under the same equivalence ratio of total fuel and partial equivalence ratio of n-heptane. The experimental results show that the suppression effectiveness increases in the order MTBE < isopropanol << ethanol < methanol. But ethanol is the best additive when the operating ranges, indicated thermal efficiency, and emissions are considered. For ethanol/n-heptane HCCI combustion, partial combustion may be observed when the mole ratio of ethanol to that of total fuel is larger than 0.20; misfires occur when the mole ratio of ethanol to that of total fuel larger than 0.25. Moreover, CO emissions strongly depend on the maximum combustion temperature, while HC emissions are mainly dominated by the mole ratio of ethanol to that of total fuel. To obtain chemical mechanistic informations relevant to the ignition behavior, detailed chemical kinetic analysis was conducted. The simulated results also confirmed the retarding of the ignition timing by ethanolmore » addition. In addition, it can be found from the simulation that HCHO, CO, and C{sub 2}H{sub 5}OH could not be oxidized completely and are maintained at high levels if the partial combustion or misfire occurs (for example, for leaner fuel/air mixture). (author)« less

Authors:
; ; ; ; ;  [1]
  1. School of Mechanical and Power Engineering, Shanghai Jiaotong University, Shanghai (China)
Publication Date:
OSTI Identifier:
20880662
Resource Type:
Journal Article
Resource Relation:
Journal Name: Combustion and Flame; Journal Volume: 149; Journal Issue: 3; Other Information: Elsevier Ltd. All rights reserved
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; 02 PETROLEUM; ETHANOL; HEPTANE; COMBUSTION; METHANOL; IGNITION; PROPANOLS; ETHERS; COMPRESSION; CHEMICAL ANALYSIS; ADDITIVES; INHIBITION; THERMAL EFFICIENCY; KNOCK CONTROL; CARBON MONOXIDE; SIMULATION; INTERNAL COMBUSTION ENGINES; EXHAUST GASES; COMBUSTION KINETICS; TEMPERATURE DEPENDENCE; CHEMICAL COMPOSITION; FORMALDEHYDE

Citation Formats

Lue, Xingcai, Ji, Libin, Zu, Linlin, Hou, Yuchun, Huang, Cheng, and Huang, Zhen. Experimental study and chemical analysis of n-heptane homogeneous charge compression ignition combustion with port injection of reaction inhibitors. United States: N. p., 2007. Web. doi:10.1016/J.COMBUSTFLAME.2007.01.002.
Lue, Xingcai, Ji, Libin, Zu, Linlin, Hou, Yuchun, Huang, Cheng, & Huang, Zhen. Experimental study and chemical analysis of n-heptane homogeneous charge compression ignition combustion with port injection of reaction inhibitors. United States. doi:10.1016/J.COMBUSTFLAME.2007.01.002.
Lue, Xingcai, Ji, Libin, Zu, Linlin, Hou, Yuchun, Huang, Cheng, and Huang, Zhen. Tue . "Experimental study and chemical analysis of n-heptane homogeneous charge compression ignition combustion with port injection of reaction inhibitors". United States. doi:10.1016/J.COMBUSTFLAME.2007.01.002.
@article{osti_20880662,
title = {Experimental study and chemical analysis of n-heptane homogeneous charge compression ignition combustion with port injection of reaction inhibitors},
author = {Lue, Xingcai and Ji, Libin and Zu, Linlin and Hou, Yuchun and Huang, Cheng and Huang, Zhen},
abstractNote = {The control of ignition timing in the homogeneous charge compression ignition (HCCI) of n-heptane by port injection of reaction inhibitors was studied in a single-cylinder engine. Four suppression additives, methanol, ethanol, isopropanol, and methyl tert-butyl ether (MTBE), were used in the experiments. The effectiveness of inhibition of HCCI combustion with various additives was compared under the same equivalence ratio of total fuel and partial equivalence ratio of n-heptane. The experimental results show that the suppression effectiveness increases in the order MTBE < isopropanol << ethanol < methanol. But ethanol is the best additive when the operating ranges, indicated thermal efficiency, and emissions are considered. For ethanol/n-heptane HCCI combustion, partial combustion may be observed when the mole ratio of ethanol to that of total fuel is larger than 0.20; misfires occur when the mole ratio of ethanol to that of total fuel larger than 0.25. Moreover, CO emissions strongly depend on the maximum combustion temperature, while HC emissions are mainly dominated by the mole ratio of ethanol to that of total fuel. To obtain chemical mechanistic informations relevant to the ignition behavior, detailed chemical kinetic analysis was conducted. The simulated results also confirmed the retarding of the ignition timing by ethanol addition. In addition, it can be found from the simulation that HCHO, CO, and C{sub 2}H{sub 5}OH could not be oxidized completely and are maintained at high levels if the partial combustion or misfire occurs (for example, for leaner fuel/air mixture). (author)},
doi = {10.1016/J.COMBUSTFLAME.2007.01.002},
journal = {Combustion and Flame},
number = 3,
volume = 149,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}