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Effect of injection timing on combustion, performance and emissions of lean-burn syngas (H2/CO) in spark-ignition direct-injection engine

Hagos, F.Y. and Aziz, A.R.A. and Sulaiman, S.A. (2016) Effect of injection timing on combustion, performance and emissions of lean-burn syngas (H2/CO) in spark-ignition direct-injection engine. International Journal of Engine Research, 17 (9). pp. 921-933.

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Official URL: https://www.scopus.com/inward/record.uri?eid=2-s2....

Abstract

This article is aimed at exploring syngas as an alternative fuel for the modern gas engines. It presents the experimental results on the effect of start of injection on combustion, performance and emissions of a direct-injection spark-ignition engine powered by syngas of H2/CO composition. The engine was operated with wide open throttle at minimum advance to achieve maximum brake torque. Two different start of injections were selected to represent before and after inlet valve closing and the excess air ratio (λ) was set at 2.3. The engine operation at start of injection = 120° before top dead center was found to be best for combustion and performance at speed up to 2100 r/min. At engine speed higher than 2100 r/min, this start of injection does not permit maximum performance due to injection duration limitation. Hence, early injection at start of injection = 180° before top dead center was adopted at higher speed with better combustion and performance. Therefore, best performance of syngas in direct-injection spark-ignition engine could be attained by setting start of injection at 120° before top dead center for lower speeds and at 180° before top dead center for speed greater than 2100 r/min. Even though fast combustion of syngas suggested late injection for better combustion, performance and emissions, its lower calorific value resulted in operational limitations for direct-injection system particularly at higher speeds maintaining air-fuel ratio close to the stoichiometry. © 2015 Institution of Mechanical Engineers.

Item Type:Article
Impact Factor:cited By 6
Uncontrolled Keywords:Alternative fuels; Combustion; Diesel engines; Engines; Ignition; Neutron emission; Speed; Synthesis gas; Timing circuits, Direct injection engines; Direct injection spark ignition engines; Injection timing; Maximum brake torques; performance; Performance and emissions; Start of injections; Syn-gas, Direct injection
ID Code:25695
Deposited By: Ms Sharifah Fahimah Saiyed Yeop
Deposited On:27 Aug 2021 09:40
Last Modified:27 Aug 2021 09:40

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