Experimental Investigation of Combustion Characteristics and Emissions of an Indirect Injection Diesel Engine under Different Operating Conditions

Türkcan, Ali; Çanakçı, Mustafa

doi:10.1021/ef800335w

Cited by 5 publications

(4 citation statements)

References 17 publications

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“…Also, the presence of ethanol in the blend increases ignition delay; hence, more fuel is accumulated in the delay period which results in rapid combustion in the premixed combustion phase causing a higher heat release rate. The heat-release profile has a slight negative dip during the ignition delay period, which is mainly heat loss from the cylinder during the fuel vaporizing phase as reported by Turkcan et al Heat released during the premixed combustion is higher for diesel−biodiesel−ethanol blends than neat diesel due to the longer ignition delay resulting from the lower cetane number and higher latent heat of vaporization of ethanol in the blend …”

Section: Resultssupporting

confidence: 52%

“…Parameters of combustion characteristics such as ignition delay, start of combustion, and the combustion duration are obtained from the heat-release curve. The start of combustion is defined as the point where the heat-release rate turns from negative to zero, and the time between the start of injection and the start of detectable heat release is denoted as the ignition delay.…”

Section: Resultsmentioning

confidence: 99%

“…The ignition delays for the D65B10E25 blend at the compression ratios of 15:1 and 19:1 are 12.8 and 9.9 °CA, respectively, at the bmep of 0.44 MPa, whereas they are 10.8 and 8.6 °CA for the neat diesel for the above conditions. The ignition delay decreases with higher brake mean effective pressure and compression ratios due to the maximum cylinder gas pressure and the higher temperature with an increasing engine load …”

Section: Resultsmentioning

confidence: 99%

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Combustion Characteristics of Diesohol Using Biodiesel as an Additive in a Direct Injection Compression Ignition Engine under Various Compression Ratios

Selvan¹,

Anand²,

Udayakumar³

2009

Energy Fuels

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An experimental investigation is carried out to study the combustion characteristics of dieselbiodiesel-ethanol blends in a single-cylinder four stroke direct injection variable compression ratio engine under the compression ratios 15:1, 17:1, and 19:1. As the ethanol is immiscible with diesel, biodiesel (jatropha methyl ester) is used as an additive to prevent the phase separation of the diesel-ethanol blends. The addition of ethanol decreases the cetane number of the blend, whereas the biodiesel addition improves the cetane number of the resultant mixture. The combustion characteristics of the stable fuel blends (D85B10E5, D80B10E10, D75B10E15, D70B10E20, and D65B10E25) are studied and compared with neat diesel by conducting experiments on the computerized variable compression ratio engine test rig. A piezoelectric pressure sensor and a crank angle encoder are used to record the cylinder gas pressure and a crank angle, respectively, to determine the combustion parameters. It is observed that the cylinder gas pressure, maximum rate of pressure rise, and heat release rate increase with higher ethanol concentration due to the longer ignition delay. Also it is found that the ignition delay decreases with the increase in compression ratio and brake mean effective pressure. The total combustion duration is longer as the total fuel consumption is higher for the diesel-biodiesel-ethanol blends than neat diesel. The exhaust gas temperature is found lower for the diesel-biodiesel-ethanol blends. The relative air fuel ratio is found higher for the diesel-biodiesel-ethanol blends than neat diesel and decreases with an increase in brake mean effective pressure. This research work established an insight on the fuel burning characteristics of the diesel-biodiesel-ethanol blends under various compression ratios and loading conditions.

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Section: Resultssupporting

confidence: 52%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Combustion Characteristics of Diesohol Using Biodiesel as an Additive in a Direct Injection Compression Ignition Engine under Various Compression Ratios

Selvan¹,

Anand²,

Udayakumar³

2009

Energy Fuels

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“…Similar trends for the heat-release curves were observed at all other engine speeds. It was observed that the area under the heat-release rate curves increased with the increasing engine load (Turkcan and Canakci, 2009).…”

Section: Heat Release Rate Resultsmentioning

confidence: 99%

Comparison of Performance and Combustion Parameters in a Heavy-Duty Diesel Engine Fueled with Iso-Butanol/Diesel Fuel Blends

Özsezen

Türkcan

Sayın

et al. 2011

Energy Exploration & Exploitation

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This study discusses the suitability of iso-butanol/diesel fuel blends as an alternative fuel and determines their effects on the performance and combustion characteristics of a heavy-duty diesel engine. For this purpose, various isobutanol/diesel fuel blends containing 5%, 10% and 15% iso-butanol were prepared in volume basis and tested in a turbo-charged, six-cylinder direct injection diesel engine at the speed of 1400 rpm and three different loads (150, 300 and 450 Nm). The results indicate that when the test engine was fueled with the iso-butanol/diesel fuel blends, the brake thermal efficiency decreased, while the brake specific fuel consumption increased with proportion to using conventional diesel fuel. When iso-butanol/diesel fuel blends were used, the heat release rate, the peak cylinder gas pressure slightly increased compared to the neat diesel fuel use. Although the iso-butanol/diesel fuel blends have poor performance values at partial engine loads, their fuel properties affected the combustion and injection characteristics. They caused reductions in CO, NO x emissions and smoke opacity. However, unburned HC emission slightly increased.Keywords: Iso-butanol, Diesel engine, Performance, Combustion, Eemission NOMENCLATURE ATDC after top dead center CA crank angle ISB10 10% iso-butanol -95% diesel fuel ISB15 15% iso-butanol -95% diesel fuel ISB5 5% iso-butanol -95% diesel fuel INTRODUCTIONIn the last two decades, there is a progressive interest on the alternative fuel use in vehicles due to the impact of the transportation sector on greenhouse gases and human health, and limited petroleum sources. Bio-fuels (methanol, ethanol, etc.) have been shown good candidates as alternative fuels for vehicles because they are liquid, and have several physical and combustion properties similar to gasoline and diesel fuel (Reijnders, 2006; Demirbas, 2007;Qin et al., 2009;Saydut et al., 2011). Alcohols have higher octane number and oxygen content. Thus, combustion of alcohols in gasoline engines show better results compared to pure gasoline. However, there have been some difficulties (ignition problem etc.) related to the use of alcohol fuel in diesel engines because of their low cetane number, high latent heat of vaporization and long ignition delay. With the aim of overcoming these problems, different methods such as alcohol fumigation, dual injection, alcohol-diesel fuel blend and alcohol-diesel fuel emulsion can be utilized (Agarwal, 2007;Riberio et al., 2007).The most attractive feature of iso-butanol is its energy content which is higher than other alcohols such as methanol, ethanol, etc. The energy content of iso-butanol is 21% less than diesel fuel. Iso-butanol has higher density than other alcohols such as ethanol and methanol etc. The density of iso-butanol improves its energy density. Another important feature of iso-butanol is less sensitivity to water than ethanol, which tends to settle in layers when water is present (Lebedevas et al., 2010). The stoichiometric airfuel ratio of iso-butanol is low...

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A comparative study of methyl ester blend ratio on thermal stability and combustion characteristics of diesel engine

Govindasamy¹,

Rajendran²

2021

J Therm Anal Calorim

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Experimental Investigation of Combustion Characteristics and Emissions of an Indirect Injection Diesel Engine under Different Operating Conditions

Cited by 5 publications

References 17 publications

Combustion Characteristics of Diesohol Using Biodiesel as an Additive in a Direct Injection Compression Ignition Engine under Various Compression Ratios

Combustion Characteristics of Diesohol Using Biodiesel as an Additive in a Direct Injection Compression Ignition Engine under Various Compression Ratios

Comparison of Performance and Combustion Parameters in a Heavy-Duty Diesel Engine Fueled with Iso-Butanol/Diesel Fuel Blends

A comparative study of methyl ester blend ratio on thermal stability and combustion characteristics of diesel engine

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