Experimental study on the auto-ignition and combustion characteristics in the homogeneous charge compression ignition (HCCI) combustion operation with ethanol/n-heptane blend fuels by port injection

Fuel ◽  
2006 ◽  
Vol 85 (17-18) ◽  
pp. 2622-2631 ◽  
Author(s):  
X LU ◽  
Y HOU ◽  
L ZU ◽  
Z HUANG
Keyword(s):  
Experimental Study ◽  
Homogeneous Charge Compression Ignition ◽  
Combustion Characteristics ◽  
Compression Ignition ◽  
Hcci Combustion ◽  
Auto Ignition ◽  
Ignition And Combustion ◽  
Homogeneous Charge

Simulating the homogeneous charge compression ignition process using a detailed kinetic model for n-heptane mixtures

2000 ◽  
Vol 1 (3) ◽  
pp. 281-289 ◽  
Author(s):  
J Kusaka ◽  
T Yamamoto ◽  
Y Daisho
Keyword(s):  
Compression Ratio ◽  
Homogeneous Charge Compression Ignition ◽  
Combustion Model ◽  
Ignition Process ◽  
Compression Ignition ◽  
Complete Combustion ◽  
Hcci Combustion ◽  
Excess Air ◽  
Auto Ignition ◽  
Homogeneous Charge

The homogeneous charge compression ignition (HCCI) combustion has been attracting growing attention in recent years due to its potential for simultaneous improvement of exhaust gas emissions and fuel consumption in diesel engines. For practical application of HCCI to internal combustion (IC) engines, precise control of auto-ignition of pre-mixtures during the compression stroke is inevitable. This paper discusses the auto-ignition processes in an HCCI engine operated with n-heptane/air mixtures using a zero-dimensional combustion model including a detailed kinetics. The model proposed is validated first by a comparison between calculated and experimental pressure diagrams, and then the effects of initial charge conditions, compression ratio and excess air ratio on ignition and combustion are investigated. It was found from the parametric study that HCCI combustion of n-heptane/air mixtures is classified into three types of combustion: complete combustion, only low-temperature reaction and misfire, depending on the compression ratio and excess air ratio at which the engine is operated. Finally, the major paths of the HCCI reaction occurring in the engine cylinder were clarified by a sensitivity analysis of chemical reactions involved in the HCCI reaction scheme.

A Spectroscopic Analysis of Combustion in Homogeneous Charge Compression Ignition Engine

2007 ◽  
Author(s):  
Akira Iijima ◽  
Hideo Shoji
Keyword(s):  
Homogeneous Charge Compression Ignition ◽  
Light Emission ◽  
Emission Spectra ◽  
Compression Ignition ◽  
Compression Ignition Engine ◽  
Strong Light ◽  
Fuel Ratio ◽  
Hcci Combustion ◽  
Ignition And Combustion ◽  
Homogeneous Charge

The principal issues of Homogeneous Charge Compression Ignition (HCCI) combustion that must be addressed include ignition timing control and expansion of the stable operation region. Detailed analyses of ignition and combustion mechanisms must be undertaken to resolve these issues. In this study, spectroscopic technique was used to investigate the effects of the air-fuel ratio (AFR) and residual gas state on ignition and combustion characteristics. Spectroscopic measurement was made of light emission spectra. The results revealed that the distribution profile of the light emission intensity of the hot flame differed substantially depending on the air-fuel ratio (AFR). In high AFR condition, a continuous spectrum attributed to carbon monoxide-oxygen (CO-O) glow is seen between 300–500 nm, but there is no strong light emission such as that from the OH radical. However, decreasing the AFR, a strong light emission is seen a little after the CO-O glow in a wavelength range from visible light to the near-infrared region (500–850 nm). It is also clear that increasing the internal EGR declined the cool flame magnitude, which substantially altered the ignition characteristics of HCCI combustion. Specifically, when a low-octane fuel was used, the heat release rate waveform for HCCI combustion showed two-stage ignition, which was clearly observed in the light emission spectra.

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