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Laser-Rayleigh Imaging of DME Sprays in an Optically Accessible DI Diesel Truck Engine

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Author

Summary, in English

Laser-Rayleigh imaging has been employed to measure the relative fuel concentration in the gaseous jet region of DME sprays. The measurements were performed in an optically accessible diesel truck engine equipped with a common rail injection system. A one-hole nozzle was used to guarantee that the recorded pressure history was associated with the heat release in the imaged spray. To compensate for the low compression ratio in the modified engine the inlet air was preheated. Spray development was studied for two levels of preheating, from the start of injection to the point where all fuel was consumed. The results indicate that there is a strong correlation between the amount of unburned fuel present in the cylinder and the rate of heat release at a given time. The combustion can not be described as purely premixed or purely mixing-controlled at any time, but always has an element of both. After all fuel appears to have vanished there is still an extended period of heat release. This indicates a rich combustion yielding combustible products.

Publishing year

2001

Language

English

Publication/Series

SAE Technical Paper 2001-01-0915

Document type

Conference paper

Publisher

Society of Automotive Engineers

Topic

  • Other Mechanical Engineering
  • Atom and Molecular Physics and Optics

Conference name

SAE World Congress, 2001

Conference date

2001-03-05 - 2001-03-08

Conference place

Detroit, MI, United States

Status

Published