Effects of Heat of Vaporization and Octane Sensitivity on Knock-Limited Spark Ignition Engine Performance [electronic resource]
Knock; Engine Performance; Spark Ignition.
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| Online Access: |
Online Access (via OSTI) |
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| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Washington, D.C. : Oak Ridge, Tenn. :
United States. Office of the Assistant Secretary of Energy Efficiency and Renewable Energy ; distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
2018.
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| Subjects: |
MARC
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| 245 | 0 | 0 | |a Effects of Heat of Vaporization and Octane Sensitivity on Knock-Limited Spark Ignition Engine Performance |h [electronic resource] |
| 260 | |a Washington, D.C. : |b United States. Office of the Assistant Secretary of Energy Efficiency and Renewable Energy ; |a Oak Ridge, Tenn. : |b distributed by the Office of Scientific and Technical Information, U.S. Department of Energy, |c 2018. | ||
| 300 | |a 2.0 MB : |b digital, PDF file. | ||
| 336 | |a text |b txt |2 rdacontent. | ||
| 337 | |a computer |b c |2 rdamedia. | ||
| 338 | |a online resource |b cr |2 rdacarrier. | ||
| 500 | |a Published through SciTech Connect. | ||
| 500 | |a 04/03/2018. | ||
| 500 | |a "nrel/cp-5400-70443" | ||
| 500 | |a Presented at WCX 18: SAE World Congress Experience, 10-12 April 2018, Detroit, Michigan. | ||
| 500 | |a Ratcliff, Matthew; Burton, Jonathan; Sindler, Petr; McCormick, Robert; Christensen, Earl; Fouts, Lisa. | ||
| 520 | 3 | |a Knock-limited loads for a set of surrogate gasolines all having nominal 100 research octane number (RON), approximately 11 octane sensitivity (S), and a heat of vaporization (HOV) range of 390 to 595 kJ/kg at 25 degrees C were investigated. A single-cylinder spark-ignition engine derived from a General Motors Ecotec direct injection (DI) engine was used to perform load sweeps at a fixed intake air temperature (IAT) of 50 degrees C, as well as knock-limited load measurements across a range of IATs up to 90 degrees C. Both DI and pre-vaporized fuel (supplied by a fuel injector mounted far upstream of the intake valves and heated intake runner walls) experiments were performed to separate the chemical and thermal effects of the fuels' knock resistance. The DI load sweeps at 50 degrees C intake air temperature showed no effect of HOV on the knock-limited performance. The data suggest that HOV acts as a thermal contributor to S under the conditions studied. Measurement of knock-limited loads from the IAT sweeps for DI at late combustion phasing showed that a 40 vol% ethanol (E40) blend provided additional knock resistance at the highest temperatures, compared to a 20 vol% ethanol blend and hydrocarbon fuel with similar RON and S. Using the pre-vaporized fuel system, all the high S fuels produced nearly identical knock-limited loads at each temperature across the range of IATs studied. For these fuels RON ranged from 99.2 to 101.1 and S ranged from 9.4 to 12.2, with E40 having the lowest RON and highest S. The higher knock-limited loads for E40 at the highest IATs examined were consistent with the slightly higher S for this fuel, and the lower engine operating condition K values arising from use of this fuel. The study highlights how fuel HOV can affect the temperature at intake valve closing, and consequently the pressure-temperature history of the end gas leading to more negative values of K, thereby enhancing the effect of S on knock resistance. | |
| 520 | 0 | |a Knock; Engine Performance; Spark Ignition. | |
| 536 | |b AC36-08GO28308. | ||
| 650 | 7 | |a Advanced Propulsion Systems. |2 edbsc. | |
| 710 | 2 | |a National Renewable Energy Laboratory (U.S.). |4 res. | |
| 710 | 1 | |a United States. |b Office of the Assistant Secretary of Energy Efficiency and Renewable Energy. |4 spn. | |
| 710 | 1 | |a United States. |b Department of Energy. |b Office of Energy Efficiency and Renewable Energy. |4 spn. | |
| 710 | 1 | |a United States. |b Department of Energy. |b Office of Scientific and Technical Information. |4 dst. | |
| 856 | 4 | 0 | |u http://www.osti.gov/scitech/biblio/1433471 |z Online Access (via OSTI) |
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| 952 | f | f | |p Can circulate |a University of Colorado Boulder |b Online |c Online |d Online |e E 1.99:nrel/cp-5400-70443 |h Superintendent of Documents classification |i web |n 1 |