The Effect of TDC Temperature and Density on the Liquid-Phase Fuel Penetration in a D. I. Diesel Engine
* 952456
A parametric study of the liquid-phase fuel penetration of evaporating Diesel fuel jets has been conducted in a direct-injection Diesel engine using laser elastic-scatter imaging. The experiments were conducted in an optically accessible Diesel engine of the “heavy-duty” size class at a representative medium speed (1200 rpm) operating condition. The density and temperature at TDC were varied systematically by adjusting the intake temperature and pressure.
At all operating conditions the measurements show that initially the liquid fuel penetrates almost linearly with increasing crank angle until reaching a maximum length. Then, the liquid-fuel penetration length remains fairly constant although fuel injection continues. At a TDC density of 16.6 kg/m3 and a temperature of about 1000 K the maximum penetration length is approximately 23 mm. However, it varies significantly as TDC conditions are changed, with the liquid-length being less at higher temperatures and at higher densities. The corresponding apparent heat release rate plots are presented and the results of the liquid-phase fuel penetration are discussed with respect to the ignition delay and premixed burn fraction.
Citation: Espey, C. and Dec, J., "The Effect of TDC Temperature and Density on the Liquid-Phase Fuel Penetration in a D. I. Diesel Engine*," SAE Technical Paper 952456, 1995, https://doi.org/10.4271/952456. Download Citation
Author(s):
Christoph Espey, John E. Dec
Pages: 19
Event:
1995 SAE International Fall Fuels and Lubricants Meeting and Exhibition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Diagnostics in Diesel and SI Engines-SP-1122, SAE 1995 Transactions: Journal of Fuels and Lubricants-V104-4
Related Topics:
Diesel / compression ignition engines
Diesel fuels
Fuel injection
Imaging and visualization
Lasers
Pressure
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