Measurements and analyses on the transient discharge coefficient of each nozzle hole of multi-hole diesel injector

Zhou, Ling; Dong, Shaofeng; Cui, Huifeng; Wu, Xinzhen; Xue, Fuying; Luo, Fei

doi:10.1016/j.sna.2016.04.017

Cited by 33 publications

(16 citation statements)

References 22 publications

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“…The position of the piston at the injection moment determines the position of the ethanol spray wall interaction position and thus affects the spatial distribution of the mixed ethanol [13]. Along with the piston moving up, the gas flow in the cylinder becomes stronger, so the flow of the gas in the cylinder at the ethanol injection moment also affects the formation of the mixed ethanol [14,15].…”

Section: Discussion and Analysismentioning

confidence: 99%

Effect of the Ethanol Injection Moment During Compression Stroke on the Combustion of Ethanol - Diesel Dual Direct Injection Engine

Zhou

Huang

et al. 2018

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract.A set of GDI system is installed on a F188 single-cylinder, air-cooled and direct injection diesel engine, which is used for ethanol injection, with the injection time controlled by the crank angle signal collected by AVL angle encoder. The injection of ethanol amounts to half of the thermal equivalent of an original diesel fuel. A 3D combustion model is established for the ethanol -diesel dual direct injection engine. Diesel was injected from the original fuel injection system, with a fuel supply advance angle of 20°CA. The ethanol was injected into the cylinder during compression process. Diesel injection began after the completion of ethanol injection. Ethanol injection starting point of 240°CA, 260°CA, 280°CA, 300°CA and 319.4°CA were simulated and analyzed. Due to the different timing of ethanol injection, the ignition of the ethanol mixture when diesel fires, results in non-uniform ignition distribution and flame propagation rate, since the distribution and concentration gradients of the ethanol mixture in the cylinder are different, thus affecting the combustion process. The results show that, when ethanol is injected at 319.4°CA, the combustion heat release rate and the pressure rise rate during the initial stage are the highest. Also, the maximum combustion pressure, with a relatively advance phase, is the highest. In case of later initial ethanol injection, the average temperature in the cylinder during the initial combustion period will have a faster rise. In case of initial injection at 319.4°CA, the average temperature in the cylinder is the highest, followed by 240°CA ethanol injection. In the post-combustion stage, the earlier ethanol injection will result in higher average temperature in the cylinder and more complete fuel combustion. The injection of ethanol at 319.4°CA produces earlier and highest NOX emissions.

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Section: Discussion and Analysismentioning

confidence: 99%

Effect of the Ethanol Injection Moment During Compression Stroke on the Combustion of Ethanol - Diesel Dual Direct Injection Engine

Zhou

Huang

et al. 2018

IOP Conf. Ser.: Earth Environ. Sci.

View full text Add to dashboard Cite

show abstract

“…During the first stage of ethanol injection, the piston is in the lower position, the cylinder pressure and temperature are lower, and air resistance of ethanol spray is low, so the spray cone is small, its penetration speed is high and the gasification is slightly slow, thus easily leading to wall interaction [11]. The ethanol mass fraction (extracted from the Section B in Figure 1) of 4 conditions at 260°CA are shown in Figure 8.…”

Section: Discussion and Analysismentioning

confidence: 99%

Analysis on Combustion Process of Ethanol - Diesel Direct Injection Engine with Two-stage Ethanol Injection Ignited by Diesel

Yu¹,

Zhou²,

Zhang³

et al. 2018

Proceedings of the 2017 4th International Conference on Machinery, Materials and Computer (MACMC 2017)

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Abstract. A set of GDI system was installed on a F188 single-cylinder, air-cooled and vertical direct injection diesel engine, which was used for ethanol injection, and the mechanical pump injection system of the original diesel engine was used for diesel injection. Ethanol and diesel account for half of the total size respectively, and the total heat energy of the fuel is equivalent to that of the original diesel engine under the same condition. A 3D combustion model is established for the ethanol -diesel direct injection engine. The ethanol injection is adopted with two-stage injection mode, with the first stage injection starting point at 240°CA and the second stage injection starting point the same as the diesel injection starting point, 344°CA. Four conditions featured by the same total two-stage ethanol injection and the first stage injection and second stage injection respectively accounting for 20% and 80% (B20L80), 40% and 60% (B40L60), 60% and 40% (B60L40) and 80% and 20% (B80L20) of the total injection are calculated and analyzed. After diesel burning, the mixed ethanol is ignited. The two-stage ethanol injection proportion is different, and ethanol premixing and diffusion combustion proportion in the cylinder is also different, thus affecting the combustion process. The result shows that, with regard to B60L40 and B40L60, cylinder combustion pressure and average temperature are higher, combustion speed is faster, combustion is more sufficient, and combustion process is better. B60L40 has the highest NO generation but the lowest soot generation, and B20L80 has the lowest NO generation but the highest soot generation.

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“…The earlier the ethanol injection starting point is, the lower the pressure and temperature of the cylinder at the corresponding moment will be. Lower pressure in the cylinder and higher penetration speed during the ethanol injection will bring smaller spray cone [14]. When the temperature is low in the cylinder during the ethanol injection, the evaporation will slow down.…”

Section: Figure 6 Soot Mass Concentration In the Cylindermentioning

confidence: 99%

Analysis on the Combustion Process of the Ethanol - Diesel Direct Injection Engine with Simultaneous Diesel and Ethanol Injection (with Ethanol Injection Starting Point Earlier than the Diesel Injection Starting Point)

Yu¹,

Zhou²,

Yao³

et al. 2018

Proceedings of the 2017 4th International Conference on Machinery, Materials and Computer (MACMC 2017)

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A set of GDI system for ethanol injection is installed on a F188 diesel engine, and the diesel supply system of the original diesel engine is used for diesel injection. The computational fluid dynamics software FIRE is adopted to establish a 3D combustion model of the ethanol -diesel direct injection engine. The total heat energy of the fuel is equivalent to that of the original diesel engine under the same condition. As the diesel injection starting point is 344°CA and there is simultaneous diesel and ethanol injection, the ethanol injection starting points at 344°CA, 338°CA, 332°CA, 326°CA and 320°CA are subject to 3D simulation for fuel injection, mixed gas formation and combustion and pollutant formation process. The results show that, the earlier the ethanol injection is, the steeper the heat release rate curve during the initial combustion period, the higher the peak value, and the shorter the heat release duration are, and the higher the maximum combustion pressure, the headmost phase of the maximum combustion pressure and the more obvious the premixed combustion are. Earlier ethanol injection starting point and quicker rise of the temperature curve of the cylinder bring the headmost phase of the highest average temperature in the cylinder, and higher average temperature in the cylinder brings higher NO concentration. The ethanol injection starting point shall be earlier than the diesel injection starting point injection, for it is the most favorable for reducing soot generation.

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Measurements and analyses on the transient discharge coefficient of each nozzle hole of multi-hole diesel injector

Cited by 33 publications

References 22 publications

Effect of the Ethanol Injection Moment During Compression Stroke on the Combustion of Ethanol - Diesel Dual Direct Injection Engine

Effect of the Ethanol Injection Moment During Compression Stroke on the Combustion of Ethanol - Diesel Dual Direct Injection Engine

Analysis on Combustion Process of Ethanol - Diesel Direct Injection Engine with Two-stage Ethanol Injection Ignited by Diesel

Analysis on the Combustion Process of the Ethanol - Diesel Direct Injection Engine with Simultaneous Diesel and Ethanol Injection (with Ethanol Injection Starting Point Earlier than the Diesel Injection Starting Point)

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