Experimental Study of the Ignition Delay for Ethanol-Powered in a Rapid Compression Machine

Sánchez, Fernando Zegarra; Braga, Carlos Valois Maciel; Braga, Leonardo C.; Braga, Sergio Leal; Dias, Flávio G.; Turkovics, Franck; Souza, Renata N. C. De

doi:10.4271/2014-36-0127

Cited by 5 publications

(4 citation statements)

References 7 publications

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“…In addition, injection pressure in injector nozzle of ED95 fuel must be higher to achieve the same amount of energy. The results also show that n-butanol, with a 10% share in the mixture, can be used as auto-ignition improver for ethanol in compression ignition systems [16][17][18][19].…”

Section: Introductionmentioning

confidence: 78%

Reactivity-controlled compression ignition (RCCI) with double direct injection of diesel and hydrous ethanol

Teixeira

Braga

Sánchez

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

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Oil is still a relevant component in the global energy matrix. However, price fluctuations, irregular production and possible shortage of oil are factors that negatively affect the world economy. Moreover, it is universal unanimity that the exploitation of oil and its derivatives causes setbacks to the environment and diminishes the population life quality. Therefore, there are studies to find natural energy sources to replace petroleum products to reduce the harmful effects caused by fossil fuels. In this work, sugarcane ethanol, widely used to supply passenger cars in Brazil, was the fuel chosen as a possible candidate for diesel replacement, even partially. To conduct the study, a reactive charge compression ignition engine fueled with diesel and ethanol was used to compare two directed injection modes: ethanol and diesel (ED) strategy (ethanol and diesel injected before top dead center (TDC)) and diesel and ethanol (DE) strategy (diesel injected before TDC and ethanol injected after TDC). In all tests in which ethanol was injected, increased ignition delay was observed. The highest efficiency was achieved using the ED injection strategy, but detonations and pressure peaks appeared. Test results also show that, using DE injection strategy, it was possible to increase the amount of ethanol injected, since no pressure peaks nor detonations appeared; however, it presented lower efficiency compared to the ED injection strategy.

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Section: Introductionmentioning

confidence: 78%

Reactivity-controlled compression ignition (RCCI) with double direct injection of diesel and hydrous ethanol

Teixeira

Braga

Sánchez

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

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show abstract

“…This period of time in the diesel engine exerts a great influence on both engine design and performance. Functionally, the ID can be divided into two parts: the physical and chemical delay [58]. The physical delay is the time between the beginning of injection and the attainment of chemical reaction conditions.…”

Section: Analysis Of Ignition Delaymentioning

confidence: 99%

Study of effects of ignition improvers on ethanol compression ignition in the rapid compression machine

Sánchez

Martins

Braga

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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The world recognizes that the main source of energy used in transportation is diesel fuel because it is more economical and is also more efficient. For this reason, various sectors of transport and fuel production are developing new technologies aiming at the replacement of traditional fossil fuels by other renewable sources. In the current market, it is possible to find systems that run on blends of diesel and other renewable fuels and test systems that run on mixtures of ethanol and some other substance to reduce auto-ignition. To be able to use ethanol in compression ignition (CI) engines where diesel fuel is typically used, the poor flammability of ethanol under compression ignition conditions is the major problem to be overcome. The techniques used in trials with CI engines to correct this problem are preheating the air in the intake manifold, increasing the compression ratio or the addition of an ignition improver for ethanol. In this study, different tests were carried out in a rapid compression machine using ignition improvers derived from polyethylene glycol. Tests were conducted for different instants for the start of injection of the mixtures and different compression ratios.

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“…However, spray combustion is a complex phenomenon that includes both physical and chemical processes (denoted as physical delay and chemical delay in this study), and both contribute to the overall ignition delay. Compared to previous studies (Henein and Bolt 1967, Ryan and Stapper 1987, Sánchez et al 2014, the physical and chemical delays in this work are defined somewhat differently. For example, physical delays can refer to the duration that includes fuel injection, atomization, and vaporization (Ryan and Stapper 1987), or the duration for the fuel-air mixture to reach its self-ignition temperature (Sánchez et al 2014), or the initiation time of pre-flame reactions (Henein and Bolt 1967).…”

Section: Effect Of Charge Gas Temperaturementioning

confidence: 99%

“…Compared to previous studies (Henein and Bolt 1967, Ryan and Stapper 1987, Sánchez et al 2014, the physical and chemical delays in this work are defined somewhat differently. For example, physical delays can refer to the duration that includes fuel injection, atomization, and vaporization (Ryan and Stapper 1987), or the duration for the fuel-air mixture to reach its self-ignition temperature (Sánchez et al 2014), or the initiation time of pre-flame reactions (Henein and Bolt 1967). Experimentally, the physical delay period can be determined by the separation of pressure traces from fuel injection into air versus into nitrogen under the same charge gas conditions (Zheng et al 2013).…”

Section: Effect Of Charge Gas Temperaturementioning

confidence: 99%

Spray and Combustion Studies of High Reactivity Gasoline in Comparison to Diesel under Advanced Compression Ignition Engine Conditions

Tang¹

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Experimental Study of the Ignition Delay for Ethanol-Powered in a Rapid Compression Machine

Cited by 5 publications

References 7 publications

Reactivity-controlled compression ignition (RCCI) with double direct injection of diesel and hydrous ethanol

Reactivity-controlled compression ignition (RCCI) with double direct injection of diesel and hydrous ethanol

Study of effects of ignition improvers on ethanol compression ignition in the rapid compression machine

Spray and Combustion Studies of High Reactivity Gasoline in Comparison to Diesel under Advanced Compression Ignition Engine Conditions

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