Experimental investigation on the effects of compression ratio on in-cylinder combustion process and performance improvement of liquefied methane engine

Fu, Jianqin; Shu, Jun; Zhou, Feng; Liu, Jingping; Xu, Zhengxin; Zeng, Dongjian

doi:10.1016/j.applthermaleng.2016.11.048

Cited by 60 publications

(14 citation statements)

References 39 publications

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“…The maximum torque produced at 5089 rpm for high compression piston was 9.6 Nm while for the low compression piston was 8.98 Nm. The results are similar to what is reported in previous research where high compression produced high power [17,[22][23][24]. The result also shows that the high thermal efficiency piston of 50% has higher torque and horsepower compared to lower thermal efficiency piston at 46%.…”

Section: Power and Torque For Low And High Compression Pistonsupporting

confidence: 91%

“…Fu et al [22] in his experiment found that the torque and thermal efficiency of LME ( liquefied Methane Engine ) could be improved by increasing the compression ratio. Under the operating conditions, the torque of LME could be increased by 9.5%.…”

Section: Compression Ratiomentioning

confidence: 99%

“…The result is similar to the experiment done by Abhishek Reddy et al [17] and Fu al. [22]. Bridjesh et al [27] also found that by lowering compression ratios from 17.5:1 to 13.7:1 in two steps by using thicker head gaskets, brake thermal efficiency of the engine drops.…”

Section: Experimental Setup Engine Specificationmentioning

confidence: 99%

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The Effect of Compression Ratio by Different Piston Head Shape on the Performance of Motorcycle Engine

Katijan¹,

Kamardin²

2019

IJAME

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The compression ratio has a significant impact on engine power, fuel economy, emission, and other performances of internal combustion engines. Basic engine theory states that a higher compression ratio produces higher torque and horsepower. One way of having different compression ratio is by changing piston head shape. A piston is a cylindrical engine component that slides back and forth in the cylinder bore via forces produced during the combustion process. The piston acts as a movable end of the combustion chamber transmitting power generated from the burning of fuel and air mixture in the combustion chamber. The objective of this study is to compare the engine performance in horsepower and torque produced by the different shapes of the piston head in an internal combustion engine. Three pistons with different head shapes - standard, mug (low compression) and dome (high compression) with a compression ratio of 8.8:1, 7.61:1 and 10.06:1 were selected for the study. An experiment was also performed to a standard piston installed with 1.5 mm gasket, which has a compression ratio of 7.31. The experiments were carried out using a standard internal combustion engine of a Honda EX5 motorcycle. The engine runs on a chassis dynamometer to measure its torque and horsepower. Piston performance was evaluated based on the maximum available torque and horsepower. The result shows that all three pistons produce different torque and horsepower. The domed piston head produces higher torque and horsepower followed by the standard and mug. By just changing the piston head shape, torque and horsepower increased up to 7.14% and 20.05% respectively.

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Section: Power and Torque For Low And High Compression Pistonsupporting

confidence: 91%

Section: Compression Ratiomentioning

confidence: 99%

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The Effect of Compression Ratio by Different Piston Head Shape on the Performance of Motorcycle Engine

Katijan¹,

Kamardin²

2019

IJAME

View full text Add to dashboard Cite

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“…In this operating condition, the ignition delays of both fuels are again the same ( Figure 8). However, the laminar flame speeds of both fuels show different behavior under high pressure and temperature [9,25]. Consequently, during the combustion process, both fuels could be faster or slower than each other.…”

Section: Combustion Analysismentioning

confidence: 99%

“…The volumetric efficiency decreases due to the CNG injected into intake port in the gas phase. CNG engine can be operated without knock by higher compression ratios [9]. Therefore, it is possible to compensate the power decrease by increasing the compression ratio [8].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Burn Duration and NO Emission in Lean Mixture with CNG and Gasoline

et al. 2019

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The results of experiments performed by gasoline and natural gas fuels in a single cylinder research engine were evaluated in this study. The main objective of this study is to compare exhaust gas emissions, efficiency, and burn durations for both fuels in stoichiometric and lean mixture. At the same time, cycle to cycle variation in these operating conditions should not exceed an acceptable value. In the ultra-lean mixture, gasoline fuel exceeded this determined limit before Compressed Natural Gas (CNG). Therefore, the reduction in NO was restricted by cyclic variations. In combustion analysis, although the burn duration of the gasoline in stoichiometric conditions was shorter than CNG, this situation reversed in favor of CNG in the ultra-lean mixtures. Contrary to some studies in the literature, the spark advance and ignition delay for CNG were the same or shorter than gasoline in this study. The primary reasons for this change are the high compression ratio and the different combustion chamber geometry. The increase in turbulence intensity has different effects on CNG and gasoline. As a result, it has been observed that NO emissions can meet the limits without a loss of efficiency for this engine operated with CNG under the ultra-lean mixture.

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Numerical and Experimental Study on Knock Sources in Spark Ignition Engine with Electromagnetic Valve Train

Feng

Chang

et al. 2020

Int.J Automot. Technol.

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Experimental investigation on the effects of compression ratio on in-cylinder combustion process and performance improvement of liquefied methane engine

Cited by 60 publications

References 39 publications

The Effect of Compression Ratio by Different Piston Head Shape on the Performance of Motorcycle Engine

The Effect of Compression Ratio by Different Piston Head Shape on the Performance of Motorcycle Engine

Investigation of Burn Duration and NO Emission in Lean Mixture with CNG and Gasoline

Numerical and Experimental Study on Knock Sources in Spark Ignition Engine with Electromagnetic Valve Train

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