Effects of injection pressure on diesel sprays in constant injection mass condition

Du, Wei; Lou, Juejue; Yu, Yan; Bao, Wenhua; Liu, Fushui

doi:10.1016/j.applthermaleng.2017.04.075

Cited by 35 publications

(15 citation statements)

References 45 publications

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“…In constant volume chambers heated up to 600-800 K, the spray penetration length and spray cone angles in liquid and vapor phases were measured with the help of Schlieren visualization [19,20]. The test injection pressures are selected as: 40, 60, 80, 100, 120, 140, and 160 MPa.…”

Section: Introductionmentioning

confidence: 99%

Experimental Studies of Fuel Injection in a Diesel Engine with an Inclined Injector

et al. 2019

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Comparative experimental studies of fuel sprays evolution dynamics in a constant volume chamber were carried out with a view to reduce the uneven distribution of diesel fuel in the combustion chamber when the Common Rail injector is inclined. The fuel sprays was captured by a high-speed camera with simultaneous recording of control pulses of camera and injector on an oscilloscope. Two eight-hole diesel injectors were investigated: One injector with identical orifice diameter (nozzle 1) and another injector with four orifices of the same diameter as orifices of nozzle 1 and four orifices of enlarged diameters (nozzle 2). Both injectors were tested at rail pressure from 100 to 165 MPa and injector control pulse width of 1.5 ms. The dynamics of changes in the spray penetration length and spray cone angle were determined. It was found that sprays develop differently in nozzle 1 fuel. The difference in the length of fuel sprays is 10–15 mm. As for nozzle 2, the fuel sprays develop more evenly: The difference in length is no more than 3–5 mm. The difference of the measured fuel spray cone angles for nozzle 1 is 0.5°–1.5°, and for nozzle 2 is 3.0°–4.0°. It is concluded that the differential increase in the diameters of nozzle orifices, the axes of which are maximally deviated from the injector axis, makes it possible to reduce the uneven distribution of fuel in the combustion chamber and improve the combustion process and the diesel performance as a whole.

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Section: Introductionmentioning

confidence: 99%

Experimental Studies of Fuel Injection in a Diesel Engine with an Inclined Injector

et al. 2019

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“…As the emission standards turn out to be more stringent, higher targets are also demanded in the research and development of the injection systems. 1,2 For characterizing the fuel injected masses and the instantaneous injected flow-rates, a series of flowmeters, based on different working principles, have been developed. Flowmeters can generally be divided into five categories: gravimetric, Coriolis, gear-type, positive-displacement and pressure-increase principle based.…”

Section: Introductionmentioning

confidence: 99%

Benchmark between Bosch and Zeuch method–based flowmeters for the measurement of the fuel injection rate

Ferrari

Zhang

2019

International Journal of Engine Research

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Bosch and Zeuch method–based flowmeters use the pressure rise triggered by the injection event in a different way in order to characterize the injected flow-rate time history. These typologies of measurement are the most widely applied to evaluate the injection rate of fuel injection systems. The injection rate of a Common Rail electroinjector has been measured with both Bosch and Zeuch method–based flowmeters. The objective has been to perform a benchmark on these two different flow-rate measuring principles. A slight reduction in the rising slope of the injected flow-rate, an anomalous tail at the end of the injection and a time delay in the flow-rate trace have been observed in the case of the Bosch method measurement. A one-dimensional numerical model of the hydraulic circuit of the flowmeter based on the Bosch method has been developed and validated successfully. This model has then been applied to study the cause and effect relationships between the features of the flowmeter hydraulic circuit and the alteration in the measured injected flow-rate pattern. Design keys for the optimization of the Bosch-based flowmeters are provided, even though the investigation has definitely assessed the superior accuracy of Zeuch method–based flowmeters, at least for the examined working conditions.

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“…The injector is the key part of the CR fuel system, and both the fuel injection and fuel spray atomization of the injector dominantly govern the combustion process and emission characteristics of diesel engines. 1,2 Figure 1 shows the typical CR injector. The CR injector is directly connected to the high-pressure fuel rail, and the high pressure exists permanently at the needle seat chamber.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on influence of inlet/outlet pressures on submerged jet flow in common rail injector

Qiu

Lei

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part D:

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The fuel flow in the working chamber of the common rail fuel injector, which is a submerged jet flow, determines the needle movement and causes great effects on the fuel injection performance. This work presents an experimental investigation on the submerged jet flow characteristics of a cylindrical orifice under conditions of varied boundary pressures. A full-scale optical test rig is set up to examine the submerged flow of the cylindrical orifice based on a fuel pump test bench. The optical experimental results reveal that the inner cylindrical orifice flow induces cavitation and causes influences on the submerged jet flow. As the inner cavitation is at the cylindrical orifice outlet, the cylindrical orifice discharge coefficient declines but the mass flow rate becomes choking. The test results also show the boundary pressures (the inlet and outlet pressures) of the cylindrical orifice have great influences on the impingement force of the submerged jet flow. The development process of the impingement force is divided into two periods: the stable period and the fluctuation period. Moreover, the impingement force increases quadratically with the increase in the mass flow rate. Once the choking flow happens, it is useless to increase the jet impingement force by improving the inlet pressure.

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Effects of injection pressure on diesel sprays in constant injection mass condition

Cited by 35 publications

References 45 publications

Experimental Studies of Fuel Injection in a Diesel Engine with an Inclined Injector

Experimental Studies of Fuel Injection in a Diesel Engine with an Inclined Injector

Benchmark between Bosch and Zeuch method–based flowmeters for the measurement of the fuel injection rate

Experimental investigation on influence of inlet/outlet pressures on submerged jet flow in common rail injector

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