Laser-Rayleigh Imaging of DME Sprays in an Optically Accessible DI Diesel Truck Engine
Författare
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.
Avdelning/ar
Publiceringsår
2001
Språk
Engelska
Publikation/Tidskrift/Serie
SAE Technical Paper 2001-01-0915
Dokumenttyp
Konferensbidrag
Förlag
Society of Automotive Engineers
Ämne
- 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