Influence of high-octane fuel blends on the performance of a two-stroke SI engine with knock-limited-compression ratio
- Argonne National Lab., IL (United States)
The use of alcohol-gasoline blends enables the favorable features of alcohols to be utilized in spark ignition (SI) engines while avoiding the shortcomings of their application as straight fuels. Eucalyptus and orange oils possess high octane values and are also good potential alternative fuels for SI engines. The high octane value of these fuels can enhance the octane value of the fuel when it is blended with low-octane gasoline. In the present work, 20 percent by volume of orange oil, eucalyptus oil, methanol and ethanol were blended separately with gasoline, and the performance, combustion and exhaust emission characteristics were evaluated at two different compression ratios. The phase separation problems arising from the alcohol-gasoline blends were minimized by adding eucalyptus oil as a cosolvent. Test results indicate that the compression ratio can be raised from 7.4 to 9 without any detrimental effect, due to the higher octane rating of the fuel blends. Knock-limited maximum brake output also increases due to extension of the knock limit. The knock limit is extended by methanol-eucalyptus-ethanol-orange oil blends, in descending order. 30 refs., 14 figs., 1 tab.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 91230
- Report Number(s):
- CONF-9410173-; TRN: 95:006038-004
- Journal Information:
- SAE Special Publication, Journal Issue: 1054; Conference: Society of Automotive Engineers (SAE) international fuels and lubricants meeting and exposition, Baltimore, MD (United States), 17-20 Oct 1994; Other Information: PBD: Oct 1994
- Country of Publication:
- United States
- Language:
- English
Similar Records
Experimental Investigation of Spark-Ignited Combustion with High-Octane Biofuels and EGR. 2. Fuel and EGR Effects on Knock-Limited Load and Speed
Investigation of Knock limited Compression Ratio of Ethanol Gasoline Blends