Combustion Heat Release Rate Comparison of Algae Hydroprocessed Renewable Diesel to F-76 in a Two-Stroke Diesel Engine
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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This thesis compared the combustion performance of algae-based hydroprocessed renewable Diesel fuel HRD and HRDF-76 blends, to that of conventional Naval Diesel fuel, F-76. The tests were conducted using a two-stroke, direct injected Detroit 3-53 Diesel engine. The cetane number CN of the HRD used was 78 while the CN of the F-76 used was 46. The start of injection SOI was measured with a strain gauge mounted on the mechanical fuel injector rocker arm. SOI was found to advance as load increased and retard as speed increased however, SOI remained constant with the use of the different fuels HRD or F-76. Ignition delay IGD decreased significantly with HRD which is consistent with the much higher CN. The heat release rate analysis performed determined that the shorter IGD of HRD led to later combustion phasing, increased overall combustion duration and lower maximum rate of pressure rise. The use of HRD also resulted in lower max cylinder pressure. These results suggest that the combustion performance of HRD has no detrimental effects on the Diesel engine tested.
- Reciprocating and Rotating Engines