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Effect of high injection pressure and ambient temperature on heat release in biodiesel combustion

Ramsy, Him (2017) Effect of high injection pressure and ambient temperature on heat release in biodiesel combustion. Masters thesis, Universiti Tun Hussein Onn Malaysia.


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Biodiesel remains an alternative fuel of interest for use in diesel engines because biodiesel fuel is economic, low density and has low viscosity. However, biodiesel fuel contributes to the emissions in term of particulate matter (PM) and nitrogen oxides (NOx). To solve this problem, a high injection pressure and ambient temperature were suggested. These factors are key elements during the ignition delay and burning process that highly affect the exhaust emissions such as Particulate Matter (PM) and Nitrogen Oxides (NOx) during the combustion process. The reduction of emissions can be achieved through the improvement in mixing fuel and air especially during the ignition delay period. The purpose of this study is to clarify the effect of variant ambient temperature and high injection pressure on combustion process and heat release using biodiesel fuel. Measurements were made in piezoelectric pressure transducer sensor on rapid compression machine (RCM) which intended to stimulate the actual compression period related phenomena. The RCM has established that with high repeatable experiment condition, up to 5 MPa and greater than 1000 K can be obtained. The biodiesel or diesel combustion was simulated using the RCM which is equipped with Denso- single-shot common-rail fuel injection system which is capable of a maximum injection pressure up to 140 MPa. The fuels that were used in this experiment are standard diesel, B5, B10 and B15. The results show that high injection pressure and variant ambient temperature using biodiesels fuel for B5, B10 and B15 strongly affects the atomization, endothermic, fuel evaporation rates during ignition delay and also affect exothermic and heat release during the combustion process. During high ambient temperature for Ti= 900 K, the period of ignition delay is become short less than 0.5 ms, the combustion become peak it almost 9 MPa and the duration of heat release is decrease around 6 ms. However, for high injection pressure at Pinj= 140 MPa the duration of ignition delay is more than 0.5 ms, but the duration of heat release is reduction around 5 ms.

Item Type: Thesis (Masters)
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ241-254.4 Machine construction (General)
Depositing User: Mr. Mohammad Shaifulrip Ithnin
Date Deposited: 06 May 2018 08:34
Last Modified: 06 May 2018 08:34
URI: http://eprints.uthm.edu.my/id/eprint/9990
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