Precombustion Fuel/Air Distribution in a Stratified Charge Engine Using Laser Raman Spectroscopy 790433
The application of cw laser Raman spectroscopy to determine precombustion fuel/air distribution in a motored, direct-injected stratified charge (DISC) engine has been demonstrated. The primary objective of the study was to obtain point measurements of the mean, gas-phase fuel/air ratio across a diameter in the combustion chamber for a single set of engine operating parameters. A secondary objective was to obtain flow visualization records of the injection-mixing process for both liquid- and gas-phase fuel injection.
Results of the study showed that large spatial variations in the fuel/air ratio occur in the cylinder during and after fuel injection. Near top-dead-center, fuel/air mixing was nearly complete, but the distribution across the cylinder diameter still exhibited a region of relatively low fuel concentration.
Citation: Johnston, S., "Precombustion Fuel/Air Distribution in a Stratified Charge Engine Using Laser Raman Spectroscopy," SAE Technical Paper 790433, 1979, https://doi.org/10.4271/790433. Download Citation
Author(s):
Sheridan C. Johnston
Pages: 29
Event:
1979 Automotive Engineering Congress and Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Stratified charge engines
Combustion chambers
Fuel injection
Engine cylinders
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