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Journal ArticleDOI

Performance and engine-out emissions evaluation of the double injection strategy applied to the gasoline partially premixed compression ignition spark assisted combustion concept

01 Dec 2014-Applied Energy (Elsevier)-Vol. 134, pp 90-101
TL;DR: In this paper, a parametric study was carried out using gasoline in a high-speed single-cylinder diesel engine equipped with a modified cylinder head, which included a spark plug.
About: This article is published in Applied Energy.The article was published on 2014-12-01 and is currently open access. It has received 86 citations till now. The article focuses on the topics: Ignition timing & Engine knocking.

Summary (2 min read)

1. INTRODUCTION

  • The outline of this paper is as follows: in the next section, the experimental facilities used to carry out this research are presented.
  • Specifically, this section describes briefly the methodology, hardware and processing tools.
  • In section 3, an overview of the double injection strategy is given by presenting a comparison of the single and double injection strategies using different operating conditions.
  • These tests consist of sweeps of the pilot injection timing and the intake oxygen concentration.
  • Finally, in section 5, the main conclusions of this research are summarized.

2.2. Test cell

  • Fractions and other values of the mixing process [38] .
  • Finally, with some other assumptions described in [31] , the model is used to obtain different temporal evolutions such as the spray liquid and vapor penetration, maximum spray velocity, equivalence ratio along the center line of the spray and the fuel mass fraction which has mixed to different equivalences ratios.
  • The fuel mass fraction is the main variable used in this research.

4. EVALUATION OF THE COMBUSTION CONCEPT USING A DOUBLE INJECTION STRATEGY

  • For this purpose, a different set of experimental results are shown and discussed.
  • In a first step, the effects of the dwell between the pilot and main injection in a split injection strategy (50% fuel mass amount in each injection) as well as the effects of the XO2 variation are analysed.
  • In a second step, the effects of the fuel mass distribution between the pilot and main injection are studied.

4.1 Effect of dwell variation and oxygen concentration

  • Focusing on the XO2 effect it is possible to state that as the intake XO2 is decreased the combustion process is worsened and the FeCE values decrease, as the individual symbols in Figure 5 show.
  • For the SoIpilot= -22 CAD aTDC, the FeCE with the double injection strategy is higher than the one obtained in the single injection strategy for intake XO2 values above 18.4% (3 rd XO2 reduction step).
  • For the SoIpilot= -19 CAD aTDC and SoIpilot= -16 CAD aTDC the FeCE drops below the single injection strategy level for the first reduction step in the XO2 (19.2%).
  • It is worthy to note that it is possible to move the engine-out emissions values for the double injection case near the emissions for the single injection case by reducing the intake oxygen concentration.

4.2 Effect of mass distribution

  • Comparing single and double injection strategies in terms of engine-out emissions, it is demonstrated that depending on the mass distribution selected for the double injection, the improvement obtained in comparison with the single injection strategy can be more or less noticeable.
  • More improvement in terms of HC, CO and ISFC in comparison to the single injection strategy is obtained in the case with the lower fuel amount injected in the pilot injection.
  • Higher FeCE implies higher temperatures and therefore higher NOx as well as lower CO and HC levels.
  • This enhancement in the combustion development is allowed by the more reactive ambient provided by the fuel stratification due to the pilot injection in which the main injection takes place.
  • Regarding soot emissions, quite similar levels for all five fuel distributions studied has been obtained.

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Cites methods from "Performance and engine-out emission..."

  • ...In this sense, the double injection strategy applied to the PPC spark assisted concept has been confirmed as a suitable strategy to improve the unburned HC and CO emissions, but still do not solve the unacceptable NOx and soot emission levels [16][17]....

    [...]

Journal ArticleDOI
01 Oct 2015-Energy
TL;DR: In this article, the effect of low reactivity fuel characteristics and blending ratio on low load RCCI (reactivity controlled compression ignition) performance and emissions was investigated using four different low reactive fuels (E10-95, E10-98, E20-95 and E85) while keeping constant the same high reactive fuel: diesel B7 (direct injected).

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TL;DR: In this paper, the authors investigated the capabilities of the reactivity controlled compression ignition combustion concept to be operated in the whole engine map and discussed its benefits when compared to conventional diesel combustion.

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References
More filters
Proceedings ArticleDOI
23 Jan 2007
TL;DR: In this article, a Swedish MK1 diesel fuel and a European gasoline of ∼95 RON were compared in a single cylinder CI engine operating at 1200 RPM with an intake pressure of 2 bar abs., intake temperature of 40°
Abstract: A Swedish MK1 diesel fuel and a European gasoline of ∼95 RON have been compared in a single cylinder CI engine operating at 1200 RPM with an intake pressure of 2 bar abs., intake temperature of 40° ...

459 citations

Proceedings ArticleDOI
J. A. Eng1
21 Oct 2002

451 citations

Proceedings ArticleDOI
16 Oct 2006
TL;DR: In this paper, a compression ignition engine can be reduced by getting combustion to occur at low temperatures and by delaying the heat release till after the combustion stage, which can reduce oxides of nitrogen (NOx) and smoke in compression ignition engines.
Abstract: Oxides of nitrogen (NOx) and smoke can be simultaneously reduced in compression ignition engines by getting combustion to occur at low temperatures and by delaying the heat release till after the ...

433 citations

Proceedings ArticleDOI
05 Mar 2001

266 citations

Frequently Asked Questions (1)
Q1. What are the contributions in this paper?

For this purpose, a 27 parametric study was carried out using gasoline in a high-speed single-cylinder diesel engine equipped 28 with a modified cylinder head, which included a spark plug.