Spray development and combustion characteristics for common rail Diesel injection systems

O. Laguitton, M.R. Gold, D.A. Kennaird, Cyril Crua, J. Lacoste, Morgan Heikal

Research output: Chapter in Book/Conference proceeding with ISSN or ISBNConference contribution with ISSN or ISBN

Abstract

An attempt to further understand the processes of auto-ignition, combustion and ultimately emission formation for a common rail diesel injection system, has lead to an investigation into the effects in-cylinder density and fuel injection pressure have on liquid penetration, vapour formation and auto-ignition delay. Although several correlations for diesel spray penetration at different operating conditions have been presented in the literature, to date the findings are in-conclusive with only limited investigation into the operating envelope expected in present and future high speed direct injection diesel engines. The present paper describes how two high-speed video cameras were utilised to achieved pseudo 3-dimensional imaging of the spray (backlit) and of auto-ignition sites (flame lumines-cence). It also describes how Schlieren imaging enabled vapour phase analysis. Data have been gathered for in-cylinder densities in the range 10 to 50 kg.m-3 and injection pressures be-tween 60 and 160 MPa. New correlations have been established for the penetration of both the liquid and vapour phases of a high-pressure diesel spray injected from a modern VCO nozzle common rail system. By increasing injection pressures and using small injector orifice sizes, it is thought that the injected diesel droplets reduce in size and penetrate further, hence increas-ing air utilisation, thus leading to faster evaporation rates and reduced ignition delay. An ex-perimental correlation for auto-ignition delay against in-cylinder density has been presented, suggesting that as the charge density increases, penetration is reduced but auto-ignition delay is reduced, indicating more favourable conditions for ignition.
Original languageEnglish
Title of host publicationIMechE Conference on Fuel Injection Systems
Publication statusPublished - 26 Nov 2002
EventIMechE Conference on Fuel Injection Systems - London, UK
Duration: 26 Nov 2002 → …

Conference

ConferenceIMechE Conference on Fuel Injection Systems
Period26/11/02 → …

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Ignition
Rails
Engine cylinders
Vapors
Imaging techniques
High speed cameras
Variable frequency oscillators
Fuel injection
Direct injection
Liquids
Video cameras
Orifices
Charge density
Diesel engines
Nozzles
Evaporation
Air

Bibliographical note

© IMechE 2003

Cite this

Laguitton, O., Gold, M. R., Kennaird, D. A., Crua, C., Lacoste, J., & Heikal, M. (2002). Spray development and combustion characteristics for common rail Diesel injection systems. In IMechE Conference on Fuel Injection Systems
Laguitton, O. ; Gold, M.R. ; Kennaird, D.A. ; Crua, Cyril ; Lacoste, J. ; Heikal, Morgan. / Spray development and combustion characteristics for common rail Diesel injection systems. IMechE Conference on Fuel Injection Systems. 2002.
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Laguitton, O, Gold, MR, Kennaird, DA, Crua, C, Lacoste, J & Heikal, M 2002, Spray development and combustion characteristics for common rail Diesel injection systems. in IMechE Conference on Fuel Injection Systems. IMechE Conference on Fuel Injection Systems, 26/11/02.

Spray development and combustion characteristics for common rail Diesel injection systems. / Laguitton, O.; Gold, M.R.; Kennaird, D.A.; Crua, Cyril; Lacoste, J.; Heikal, Morgan.

IMechE Conference on Fuel Injection Systems. 2002.

Research output: Chapter in Book/Conference proceeding with ISSN or ISBNConference contribution with ISSN or ISBN

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T1 - Spray development and combustion characteristics for common rail Diesel injection systems

AU - Laguitton, O.

AU - Gold, M.R.

AU - Kennaird, D.A.

AU - Crua, Cyril

AU - Lacoste, J.

AU - Heikal, Morgan

N1 - © IMechE 2003

PY - 2002/11/26

Y1 - 2002/11/26

N2 - An attempt to further understand the processes of auto-ignition, combustion and ultimately emission formation for a common rail diesel injection system, has lead to an investigation into the effects in-cylinder density and fuel injection pressure have on liquid penetration, vapour formation and auto-ignition delay. Although several correlations for diesel spray penetration at different operating conditions have been presented in the literature, to date the findings are in-conclusive with only limited investigation into the operating envelope expected in present and future high speed direct injection diesel engines. The present paper describes how two high-speed video cameras were utilised to achieved pseudo 3-dimensional imaging of the spray (backlit) and of auto-ignition sites (flame lumines-cence). It also describes how Schlieren imaging enabled vapour phase analysis. Data have been gathered for in-cylinder densities in the range 10 to 50 kg.m-3 and injection pressures be-tween 60 and 160 MPa. New correlations have been established for the penetration of both the liquid and vapour phases of a high-pressure diesel spray injected from a modern VCO nozzle common rail system. By increasing injection pressures and using small injector orifice sizes, it is thought that the injected diesel droplets reduce in size and penetrate further, hence increas-ing air utilisation, thus leading to faster evaporation rates and reduced ignition delay. An ex-perimental correlation for auto-ignition delay against in-cylinder density has been presented, suggesting that as the charge density increases, penetration is reduced but auto-ignition delay is reduced, indicating more favourable conditions for ignition.

AB - An attempt to further understand the processes of auto-ignition, combustion and ultimately emission formation for a common rail diesel injection system, has lead to an investigation into the effects in-cylinder density and fuel injection pressure have on liquid penetration, vapour formation and auto-ignition delay. Although several correlations for diesel spray penetration at different operating conditions have been presented in the literature, to date the findings are in-conclusive with only limited investigation into the operating envelope expected in present and future high speed direct injection diesel engines. The present paper describes how two high-speed video cameras were utilised to achieved pseudo 3-dimensional imaging of the spray (backlit) and of auto-ignition sites (flame lumines-cence). It also describes how Schlieren imaging enabled vapour phase analysis. Data have been gathered for in-cylinder densities in the range 10 to 50 kg.m-3 and injection pressures be-tween 60 and 160 MPa. New correlations have been established for the penetration of both the liquid and vapour phases of a high-pressure diesel spray injected from a modern VCO nozzle common rail system. By increasing injection pressures and using small injector orifice sizes, it is thought that the injected diesel droplets reduce in size and penetrate further, hence increas-ing air utilisation, thus leading to faster evaporation rates and reduced ignition delay. An ex-perimental correlation for auto-ignition delay against in-cylinder density has been presented, suggesting that as the charge density increases, penetration is reduced but auto-ignition delay is reduced, indicating more favourable conditions for ignition.

M3 - Conference contribution with ISSN or ISBN

BT - IMechE Conference on Fuel Injection Systems

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Laguitton O, Gold MR, Kennaird DA, Crua C, Lacoste J, Heikal M. Spray development and combustion characteristics for common rail Diesel injection systems. In IMechE Conference on Fuel Injection Systems. 2002