Potential of Early Direct Injection (EDI) for simultaneous NOx and soot emission reduction in a heavy duty turbocharged diesel engine

Pandey, Sunil Kumar and Vandana, Suryanarayana and Akella, S. R. Sarma and Ravikrishna, R V (2019) Potential of Early Direct Injection (EDI) for simultaneous NOx and soot emission reduction in a heavy duty turbocharged diesel engine. In: APPLIED THERMAL ENGINEERING, 158 .

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Abstract

Early Direct Injection (EDI) in diesel engines with multiple injections has the potential to simultaneously reduce Nitrogen Oxide (NOx) and soot. The current work involved carrying out three-dimensional Computational Fluid Dynamic (CFD) simulations and engine experiments in order to evaluate EDI strategies on a heavy-duty diesel-fuelled engine operating at 25% load with the motivation to operate in Homogeneous Charge Compression Ignition (HCCI) mode. A uniformity Index (UI) parameter was defined to assess charge homogeneity. Results showed significant in-homogeneity and presence of wall-film for EDI. Simulations were conducted to assess improvement of charge homogeneity by several strategies; narrow spray included angle, injection timing, multiple injections and intake air heating. The maximum UI achieved by EDI was 0.78. Further work involved engine experimentation to assess the EDI strategy with dual injection. The first injection timing was varied from 90 degrees to 20 degrees Before Top Dead Center (BTDC) with cooled Exhaust Gas Recirculation (EGR) rate of 20%. The effect of EGR rate (0 to 35%) on the combustion behaviour was studied. An Optimized EDI (OptimEDI) strategy was developed which consisted of triple injections with fuel mass split ratio of 41%-45%-14% and an early first injection. This strategy gave 20% NOx and soot reduction simultaneously over the conventional Compression Ignition (CI) mode.

Item Type:	Journal Article
Publication:	APPLIED THERMAL ENGINEERING
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Additional Information:	copyright for this article belongs to PERGAMON-ELSEVIER SCIENCE LTD
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	19 Aug 2019 11:33
Last Modified:	19 Aug 2019 11:33
URI:	http://eprints.iisc.ac.in/id/eprint/63299

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