Sources of Hydrocarbon Emissions from a Small Direct Injection Diesel Engine

Matsui, Yukio; Sugihara, Kunihiko

doi:10.4271/871613

Cited by 37 publications

(11 citation statements)

References 4 publications

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“…As Figure 7 shows, the OH* intensity for an injection pressure of 200 MPa near the projected impinging point is very low; therefore, one explanation for the low integrated OH* intensity at an injection pressure of 200 MPa is that the mixture is lean and there are some regions where the mixture is not sufficiently rich to be burned. Moreover, the serious wetting effect which has been demonstrated to be a key factor for partial combustion [35][36][37] may also play a role in the low integrated OH* intensity at an injection pressure of 200 MPa; the near-wall liquid phase cannot be burned by the surrounding low-temperature flame, as Figure 7 shows.…”

Section: Different Injection Pressuresmentioning

confidence: 99%

Effect of flat-wall impingement on diesel spray combustion

Li¹,

Nishida²,

Ogata³

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part D:

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The effect of spray–flat-wall interaction on the diesel combustion characteristics in a constant-volume vessel was investigated. A flat wall was fixed perpendicular to the nozzle hole axis. Three injection pressures of 100 MPa, 150 MPa and 200 MPa and a single nozzle hole with a diameter of 0.133 mm were employed. Mie scattering was adopted to detect the spray formation process; OH* chemiluminescence and natural colour luminosity were conducted to analyse the combustion process. The two-colour method was applied to calculate the soot emissions and the temperature distribution. The results reveal that, in comparison with a free spray flame, flat-wall impingement causes diesel combustion to deteriorate when the liquid phase–wall interaction occurs; however, when an appropriate impinging distance (longer than liquid-phase penetration) is selected, combustion is observed to be enhanced. As for the impinging spray flame, when the injection pressure is increased, soot formation decreases; however, combustion is not linearly enhanced by increasing the injection pressure, and the OH* chemiluminescence intensity achieves the highest value with an injection pressure of 150 MPa.

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Section: Different Injection Pressuresmentioning

confidence: 99%

Effect of flat-wall impingement on diesel spray combustion

Li¹,

Nishida²,

Ogata³

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…In the aforementioned applications the hydrodynamic, and in some cases thermal, characteristics of the post-impingement droplets are important issues in injection system design. Of particular interest in the engine context are : (i) the total fuel mass, momentum and energy deposited as and to wall films which, if not evaporated completely during combustion, are responsible for contributing to enhanced levels of unburnt hydrocarbon emissions [1,2]; and (ii) the fuel vapour distribution in the near-wall region. The latter is closely related to the flame quenching phenomenon [3] which occurs when the flame closely approaches the cool walls of the chamber.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Gasoline Spray Impingement

2002

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This paper is concerned with aspects of gasoline spray droplet impingement simulation, for which an improved model has been developed for predicting the outcomes of spray droplets impacting on a wall. The model is assessed by simulating experiments on oblique spray impingement in a wind tunnel. This is done with the aid of a specially-devised procedure for deducing the specification of initial droplet sizes and velocities at the gasoline injector from downstream measurements. The calculated wall spray characteristics show favourable agreement with the measurements.

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“…The characteristics of impinging spray are important because they influence fuel vapor distribution, combustion process and exhaust emissions. Wall impingement can cause high hydrocarbon emissions and soot formation in small HSDI diesel engines (Matsui, 1986). Werlberger and Cartellieri (1987) observed the impinging spray in a small bore direct injection diesel engine.…”

Section: Introductionmentioning

confidence: 99%

Calculation of fuel spray impingement and fuel film formation in an HSDI diesel engine

Kim

Min

2002

KSME International Journal

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Spray impingement and fuel film formation models with cavitation have been developed and incorporated into the computational fluid dynamics code, STAR-CD. The spray/wall interaction process was modeled by considering the effects of surface temperature conditions and fuel film formation. The behavior of fuel droplets after impingement was divided into rebound, spread and splash using the Weber number and parameter K(jWelJ(e). The spray impingement model accounts for mass conservation, energy conservation, and heat transfer to the impinging droplets. The fuel film formation model was developed by integrating the continuity, momentum, and energy equations along the direction of fuel film thickness. Zero dimensional cavitation model was adopted in order to consider the cavitation phenomena and to give reasonable initial conditions for spray injection. Numerical simulations of spray tip penetration, spray impingement patterns, and the mass of film-state fuel matched well with the experimental data. The spray impingement and fuel film formation models have been applied to study spray/wall impingement in high-speed direct injection diesel engines.

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Sources of Hydrocarbon Emissions from a Small Direct Injection Diesel Engine

Cited by 37 publications

References 4 publications

Effect of flat-wall impingement on diesel spray combustion

Effect of flat-wall impingement on diesel spray combustion

Modeling of Gasoline Spray Impingement

Calculation of fuel spray impingement and fuel film formation in an HSDI diesel engine

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