ANALYSIS OF THE POSSIBILITIES OF REGULATING THE PROCESS OF MIXTURE FORMATION IN MICROJET BURNERS WITH CYLINDRICAL FLAME STABILIZERS

This study investigated the effect of n-heptane and n-decane on exhaust odour in direct injection (DI) diesel engines. The prospect of these alternative fuels to reduce wall adherence and overleaning, major sources of incomplete combustion, as well as odorous emissions has been investigated. The n-heptane was tested as a low boiling point fuel that can improve evaporation as well as wall adherence. However, the odour is a little worse with n-heptane and blends than that of diesel fuel due to overleaning of the mixture. Also, formaldehyde (HCHO) and total hydrocarbon (THC) in the exhaust increase with increasing n-heptane content. The n-decane was tested as a fuel with a high cetane number that can improve ignition delay, which has a direct effect on wall adherence and overleaning. However, with n-decane and blends, the odour rating is about 0.5-1 point lower than for diesel fuel. Moreover, the aldehydes and THC are significantly reduced. This is due to less wall adherence and proper mixture formation.

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Review of the Investigation of Fuel-Air Premixing and Combustion Process Using Rapid Compression Machine and Direct Visualization System

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.465-466.265 ◽

2013 ◽

Vol 465-466 ◽

pp. 265-269 ◽

Cited By ~ 2

Author(s):

Mohamad Jaat ◽

Amir Khalid ◽

Bukhari Manshoor ◽

Siti Mariam Basharie ◽

Him Ramsy

Keyword(s):

High Speed ◽

Combustion Engine ◽

Early Stage ◽

Combustion Process ◽

Injection Pressure ◽

Rapid Compression Machine ◽

Mixture Formation ◽

Visualization System ◽

Optical Visualization ◽

Rapid Compression

s :This paper reviews of some applications of optical visualization system to compute the fuel-air mixing process during early stage of mixture formation and late injection in Diesel Combustion Engine. This review has shown that the mixture formation is controlled by the characteristics of the injection systems, the nature of the air swirl and turbulence in thecylinder, and spray characteristics. Few experimental works have been investigated and found that the effects of injection pressure and swirl ratio have a great effect on the mixture formation then affects to the flame development and combustion characteristics.This paper presents the significance of spray and combustion study with optical techniques access rapid compression machine that have been reported by previous researchers. Experimental results are presentedin order to provide in depth knowledge as assistance to readers interested in this research area. Analysis of flame motion and flame intensity in the combustion chamber was performed using high speed direct photographs and image analysis technique. The application of these methods to the investigation of diesel sprays highlights mechanisms which provide a better understanding of spray and combustion characteristics.

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