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Study of low load performance on a two-stroke direct injection spark ignition aero-piston engine fuelled with diesel

Rui Liu (Jiangsu Province Key Laboratory of Aerospace Power System, Nanjing University of Aeronautics and Astronautics, Nanjing, China and School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, China)
Haocheng Ji (Jiangsu Province Key Laboratory of Aerospace Power System, Nanjing University of Aeronautics and Astronautics, Nanjing, China)
Minxiang Wei (Jiangsu Province Key Laboratory of Aerospace Power System, Nanjing University of Aeronautics and Astronautics, Nanjing, China)

Aircraft Engineering and Aerospace Technology

ISSN: 0002-2667

Article publication date: 25 September 2020

Issue publication date: 23 June 2021

160

Abstract

Purpose

The purpose of this paper is to investigate power performance, economy and hydrocarbons (HC)/carbon monoxide (CO) emissions of diesel fuel on a two-stoke direct injection (DI) spark ignition (SI) engine.

Design/methodology/approach

Experimental study was carried out on a two-stroke SI diesel-fuelled engine with air-assisted direct injection, whose power performance and HC/CO emissions characteristics under low-load conditions were analysed according to the effects of ignition energy, ignition advance angle (IAA), injection timing angle and excess-air-ratio.

Findings

The results indicate that, for the throttle position of 10%, a large IAA with adequate ignition energy effectively increases the power and decrease the HC emission. The optimal injection timing angle for power and fuel consumption is 60° crank angle (CA) before top dead centre (BTDC). Lean mixture improves the power performance with the HC/CO emissions greatly reduced. At the throttle position of 20%, the optimal IAA is 30°CA BTDC. The adequate ignition energy slightly improves the power output and greatly decreases HC/CO emissions. Advancing the injection timing improves the power and fuel consumption but should not exceed the exhaust port closing timing in case of scavenging losses. Burning stoichiometric mixture achieves maximum power, whereas burning lean mixture obviously reduces the fuel consumption and the HC/CO emissions.

Practical implications

Gasoline has a low flash point, a high-saturated vapour pressure and relatively high volatility, and it is a potential hazard near a naked flame at room temperature, which can create significant security risks for its storage, transport and use. The authors adopt a low volatility diesel fuel for all vehicles and equipment to minimise the number of different devices using various fuels and improve the potential military application safety.

Originality/value

Under low-load conditions, the two stroke port-injected SI engine performance of burning heavy fuels including diesel or kerosene was shown to be worse than those of gasoline. The authors have tried to use the DI method to improve the performance of the diesel-fuelled engine in starting and low-load conditions.

Keywords

Acknowledgements

The authors are particularly grateful for support of open funding from the Jiangsu Province Key Laboratory of Aerospace Power Systems (Grant number: CEPE2018003) and State Key Laboratory of Engines, Tianjin University (Grant number: K2020-05). This research work was also partially supported by the Funding of the Jiangsu Innovation Program for Graduate Education (KYLX15_0262) from the Fundamental Research Funds for the Central Universities.

Citation

Liu, R., Ji, H. and Wei, M. (2021), "Study of low load performance on a two-stroke direct injection spark ignition aero-piston engine fuelled with diesel", Aircraft Engineering and Aerospace Technology, Vol. 93 No. 3, pp. 473-482. https://doi.org/10.1108/AEAT-08-2020-0158

Publisher

:

Emerald Publishing Limited

Copyright © 2020, Emerald Publishing Limited

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