An investigation of injection rate controlled heat release of low cetane fuels in a direct injected diesel engine
Assisted ignition and subsequent combustion of various fuels differing in volatility and viscosity in a Diesel engine is described. This study was conducted to investigate the feasibility of igniting low cetane fuels at the immediate vicinity of the nozzle orifice in an attempt to produce injection rate controlled heat release. Four fuels were studied: a high viscosity Diesel blend, strait gasoline, and No. 2 Diesel fuel which was used as a baseline for comparison purposes. A droplet ignition delay model was used to provide insight into the various physical processes that occur when heat release is controlled by rate of injection. Split injection timing predicted by the model resulted in the successful occurrence of rate controlled heat release for all of the fuels tested. Further, results of this study demonstrate that high pressure gradients normally associated with low cetane fuels can be significantly reduced or entirely eliminated with the ignition-technique. The fuels examined in this study bracketed a broad spectrum of fuel distillate thereby demonstrating the usefulness of this technique for other fuels as well as those tested.
- OSTI ID:
- 5752874
- Report Number(s):
- CONF-9010205--
- Country of Publication:
- United States
- Language:
- English
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