Numerical Analysis of a Liquid Nitrogen (LN 2 ) Engine for Efficient Energy Conversion.

Autor: Rizvi SFJ; School of Mechanical Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, U.K., Miran S; Department of Mechanical Engineering, University of Gujrat, Gujrat 50700, Pakistan., Azam M; Institute of Chemical, Environmental and Bioscience Engineering, TU Wien, Getreidemarkt 9/166, 1060 Vienna, Austria.; Institute of Chemical Engineering & Technology, University of the Punjab, Lahore 54000, Pakistan., Arif W; Department of Mechanical Engineering, University of Gujrat, Gujrat 50700, Pakistan., Wasif M; Department of Electrical Engineering, University of Gujrat, Gujrat 50700, Pakistan., Garcia HP; School of Mechanical Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, U.K.
Jazyk: angličtina
Zdroj: ACS omega [ACS Omega] 2021 Jun 07; Vol. 6 (24), pp. 15663-15673. Date of Electronic Publication: 2021 Jun 07 (Print Publication: 2021).
DOI: 10.1021/acsomega.1c00582
Abstrakt: A liquid fuel that produces no toxic exhaust could help reduce pollution, potentially in urban areas. In this study, a simulation was conducted using the AVL Boost platform, on the use of liquid nitrogen (LN 2 ) in a four-stroke engine. This study is focused on engine performance using directly introduced LN 2 and the analysis of related aspects (inlet, outlet, and in-cylinder pressure, temperature, conditions for LN 2 evaporation, etc.) that indicate the possible potential for the development of a zero-emission direct injection internal evaporation (DI-IE) LN 2 engine. AVL Boost software was uniquely customized to accommodate the simulations, as modeling with LN 2 was not available in the standard features. Simulation results, including indicated mean effective pressure (IMEP), effective torque, and power, were compared with similarly sized diesel and gasoline engines running at speeds of up to 1000 rpm. The LN 2 injection mass was matched with air intake to evaluate the optimal combination. The simulation results showed that the enthalpy of the aspirated air was sufficient to evaporate and expand the injected amount of LN 2 in each cycle, generating the in-cylinder pressure for the power stroke. The IMEP of the LN 2 engine was similar to internal combustion engines, and its indicated efficiency was about four times higher (56-62%). The air separation process was 44% efficient in producing the required LN 2 , making the overall efficiency about 31%.
Competing Interests: The authors declare no competing financial interest.
(© 2021 The Authors. Published by American Chemical Society.)
Databáze: MEDLINE
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