Title: The effects of injected fuel temperature on exergy balance under the various operating loads in a DI diesel engine

Authors: Arash Nemati; Ramin Barzegar; Shahram Khalilarya

Addresses: Young Researchers and Elite Club, Miyaneh Branch, Islamic Azad University, Miyaneh, Iran ' Young Researchers and Elite Club, Parsabad Moghan Branch, Islamic Azad University, Parsabad, Iran ' Department of Mechanical Engineering, Urmia University, Urmia 57169-33111, Iran

Abstract: In the present paper, the effects of fuel preheating on exergy analysis under the various operating loads in a DI diesel engine have been investigated. The combustion process is simulated utilising a three dimensional computational fluid dynamic (CFD) code. The second-law terms have been computed by a developed FORTRAN code. The calculations are carried out for three operating loads (50%, 75% and full load) and for each of them, four injected fuel temperatures have been mentioned: T_fuel =353, 383 K as low and T_fuel = 463, 493 K as high-temperature cases. The obtained results indicated that increasing the injected fuel temperature leads to increase in fuel spray atomisation, better air-fuel mixing and improves combustion characteristics. Also, increasing the injected fuel temperature causes to increase the indicated work and heat loss availabilities, and decreases the exhaust gas availability and combustion irreversibilities.

Keywords: DI diesel engines; injected fuel temperature; exergy analysis; engine load; irreversibility; CFD; computational fluid dynamics; fuel injection; fuel preheating; simulation; exhaust gas; fuel spray atomisation; air-fuel mixing; combustion; heat loss.

DOI: 10.1504/IJEX.2015.069317

International Journal of Exergy, 2015 Vol.17 No.1, pp.35 - 53

Received: 18 Nov 2013
Accepted: 08 May 2014
Published online: 11 May 2015 *

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