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Effects of Gasoline Composition on C...

Yoo, Kwang Hee.

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Effects of Gasoline Composition on Compression Ignition in a Motored Engine.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Effects of Gasoline Composition on Compression Ignition in a Motored Engine./
作者:	Yoo, Kwang Hee.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
面頁冊數:	147 p.
附註:	Source: Dissertations Abstracts International, Volume: 81-11, Section: B.
Contained By:	Dissertations Abstracts International81-11B.
標題:	Automotive engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28006613
ISBN:	9798643185963

Effects of Gasoline Composition on Compression Ignition in a Motored Engine.
Yoo, Kwang Hee.

Effects of Gasoline Composition on Compression Ignition in a Motored Engine. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 147 p.

Source: Dissertations Abstracts International, Volume: 81-11, Section: B.

Thesis (Ph.D.)--University of Michigan, 2020.

This item must not be sold to any third party vendors.

This study presents a fundamental investigation of gasoline autoignition behavior in a compression ignition engine, which is of great importance for next generation engine designs that employ low temperature combustion strategies. A total of eleven full boiling range gasolines with different octane number and sensitivity have been tested in a motored engine and a constant volume combustion chamber at various pressures, temperatures, and oxygen concentrations. For quantification of intermediate temperature heat release (ITHR), a new method was applied to the engine data by examining the maximum value of the second derivative of heat release rate. Combustion phasing comparisons of single-stage ignition fuels with various octane sensitivity showed that fuel with less octane sensitivity became more reactive as intake temperature and simulated exhaust gas recirculation (EGR) ratio decreased, while fuel with higher octane sensitivity had a reverse trend. When low temperature heat release (LTHR) was not active, the amount of ITHR increased as the intake temperature and oxygen mole fraction increased. These ITHR trends, depending on octane sensitivity, were almost identical with the trends of combustion phasing, showing that ITHR significantly affects fuel autoignition reactivity and determines octane sensitivity. In addition, the strong dependence of ITHR on equivalence ratio enhanced the ϕ-sensitivity. For the similar combustion phasing, the higher octane sensitivity fuels exhibited faster rise rates of ITHR intensity than the lower octane sensitivity fuels, leading to more advanced hot-ignition phasing with increasing equivalence ratio.For two-stage ignition fuels, LTHR significantly enhanced ITHR, eventually advancing the autoignition timing. Both LTHR and ITHR were suppressed by increasing the simulated EGR ratio. The intake pressure boosting increased LTHR whereas the magnitude of ITHR for fuels with a lower research octane number (RON), which exhibited a great amount of ITHR, became saturated as the intake pressure increased. However, the average ITHR per crank angle increased with the intake pressure, showing concise and strong intermediate temperature reaction.With regard to physical property effects, higher aromatic content led to lower volatility and higher density, resulting in a slower liquid fuel evaporation process. The physical ignition delay was very sensitive to air temperature whereas oxygen dilution rarely affected the physical ignition delay. With regard to chemical property effects at the same RON, fuel with a higher aromatic content was more resistant to autoignite at high pressure and less sensitive to the oxygen dilution whereas the alkane-rich fuel was less sensitive to the temperature due to pronounced negative temperature coefficient (NTC) behavior. For the same RON and octane sensitivity, fuel with a higher amount of n-alkane was less sensitive to the oxygen dilution.

ISBN: 9798643185963Subjects--Topical Terms:

2181195
Automotive engineering.
Subjects--Index Terms:

Intermediate temperature heat Release

Effects of Gasoline Composition on Compression Ignition in a Motored Engine.
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300 $a 147 p.
500 $a Source: Dissertations Abstracts International, Volume: 81-11, Section: B.
500 $a Advisor: Boehman, Andre L.
502 $a Thesis (Ph.D.)--University of Michigan, 2020.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a This study presents a fundamental investigation of gasoline autoignition behavior in a compression ignition engine, which is of great importance for next generation engine designs that employ low temperature combustion strategies. A total of eleven full boiling range gasolines with different octane number and sensitivity have been tested in a motored engine and a constant volume combustion chamber at various pressures, temperatures, and oxygen concentrations. For quantification of intermediate temperature heat release (ITHR), a new method was applied to the engine data by examining the maximum value of the second derivative of heat release rate. Combustion phasing comparisons of single-stage ignition fuels with various octane sensitivity showed that fuel with less octane sensitivity became more reactive as intake temperature and simulated exhaust gas recirculation (EGR) ratio decreased, while fuel with higher octane sensitivity had a reverse trend. When low temperature heat release (LTHR) was not active, the amount of ITHR increased as the intake temperature and oxygen mole fraction increased. These ITHR trends, depending on octane sensitivity, were almost identical with the trends of combustion phasing, showing that ITHR significantly affects fuel autoignition reactivity and determines octane sensitivity. In addition, the strong dependence of ITHR on equivalence ratio enhanced the ϕ-sensitivity. For the similar combustion phasing, the higher octane sensitivity fuels exhibited faster rise rates of ITHR intensity than the lower octane sensitivity fuels, leading to more advanced hot-ignition phasing with increasing equivalence ratio.For two-stage ignition fuels, LTHR significantly enhanced ITHR, eventually advancing the autoignition timing. Both LTHR and ITHR were suppressed by increasing the simulated EGR ratio. The intake pressure boosting increased LTHR whereas the magnitude of ITHR for fuels with a lower research octane number (RON), which exhibited a great amount of ITHR, became saturated as the intake pressure increased. However, the average ITHR per crank angle increased with the intake pressure, showing concise and strong intermediate temperature reaction.With regard to physical property effects, higher aromatic content led to lower volatility and higher density, resulting in a slower liquid fuel evaporation process. The physical ignition delay was very sensitive to air temperature whereas oxygen dilution rarely affected the physical ignition delay. With regard to chemical property effects at the same RON, fuel with a higher aromatic content was more resistant to autoignite at high pressure and less sensitive to the oxygen dilution whereas the alkane-rich fuel was less sensitive to the temperature due to pronounced negative temperature coefficient (NTC) behavior. For the same RON and octane sensitivity, fuel with a higher amount of n-alkane was less sensitive to the oxygen dilution.
590 $a School code: 0127.
650 4 $a Automotive engineering. $3 2181195
650 4 $a Chemical engineering. $3 560457
650 4 $a Mechanical engineering. $3 649730
653 $a Intermediate temperature heat Release
653 $a Octane sensitivity
653 $a Gasoline compression ignition
653 $a FACE gasoline
653 $a Ignition delay
653 $a Autoignition
690 $a 0548
690 $a 0540
690 $a 0542
710 2 $a University of Michigan. $b Mechanical Engineering. $3 2104815
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793 $a English
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