Influence of injection rate shaping on combustion and emissions for a medium duty diesel engine

Benajes, Jesús; Molina, Santiago; Rudder, Korneel De; Rente, Tanja

doi:10.1007/bf02915967

Cited by 15 publications

(5 citation statements)

References 20 publications

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“…The injection rate during the injection period is decreased with its wave extension inclined toward flat graduation. Also, the total injection rate curve of each nozzle hole follows the same pattern as the fuel injection system, which is gradually changing from the "boots" to the "rectangles" [12].…”

Section: Variation Of Injection Ratementioning

confidence: 97%

A Study on the Influence of Fuel Pipe on Fuel Injection Characteristics of Each Nozzle Hole in Diesel Injector

Luo

Wang

Xue

et al. 2016

MATEC Web of Conferences

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Abstract. The inner diameter of high pressure fuel pipe has a significant effect on the fuel injection process and the performance of a diesel engine. The spray impact force of each nozzle hole of a conventional injection system of pump-line-nozzle for diesel engine (based on the spray momentum flux) and the injection pressure (on a fuel injection pump test rig) were measured. With varying fuel injection quantities and pump speed, the effects of the inner diameter of the high pressure fuel pipe on fuel injection process and the fuel injection characteristics of each nozzle hole were analyzed. It was noted from experimental results that the fuel injection pressure changes with variations in the inner diameter of the high pressure fuel pipe and also the injection duration gradually increases with increase in the inner diameter. .At low injection pump speed, even with the same geometric fuel deliver rate, the injection duration also increases gradually. Due to throttling effect and reduction in injection pressure, the fuel injection quantities of the injection nozzle were relatively minimal when the inner diameters of the high pressure fuel pipe were respectively small and large. The optimum injection pipe inner diameter for the right quantity for fuel injection falls between the two cases (between small and large). In addition, the injection rate of each nozzle hole increases with the decrease in angle between the needle axis and each of the nozzle hole axis. The fuel injection quantity of each nozzle hole increases while their relative difference decreases with increasing pump speed.

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Section: Variation Of Injection Ratementioning

confidence: 97%

A Study on the Influence of Fuel Pipe on Fuel Injection Characteristics of Each Nozzle Hole in Diesel Injector

Luo

Wang

Xue

et al. 2016

MATEC Web of Conferences

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“…In the particular case of a Diesel spray, it seems reasonable, taking into account the typical droplets diameter distribution, to consider the extinction efficiency as constant for all the experiments and equal to 2.1 [[28]] (It is actually oscillating between 2 and 2.5 with droplets of diameters from 5 to 50 m at 532 nm [ [29]]). The number density (n) is the number of particles present in the volume considered for the calculation and can also be expressed as follows: (4) Here, N is the total number of particles within volume V. Finally, the path length l is the thickness of the spray at the measuring location and can be obtained through macrovisualization and assuming axial symmetry for the Diesel spray.…”

Section: Optical Depth Calculationmentioning

confidence: 99%

“…Thus, DI Diesel spray properties have been deeply investigated and new technologies have been developed to increase the engine efficiency by providing injected spray with higher air entrainment and so better mixing processes by reducing orifice size, increasing injection pressure and redesigning nozzle geometry that finally increase combustion efficiency and reduce pollutant emissions [ [4]- [6]]. …”

Section: Introductionmentioning

confidence: 99%

Determination of the optical depth of a DI diesel spray

et al. 2011

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The optical depth is responsible of limiting the optical diagnostic using visible wavelength in the sprays. This paper proposes to measure the optical depth directly in a real Diesel spray through line-of-sight laser extinction measurements. This easily reproducible method which does not require expensive or complex optical techniques is detailed and the measurement procedure is presented in this paper. As diesel sprays are mostly optically thick, the measurements in the denser region are not reliable and a fuel concentration model has been used to derive the results to the entire spray. This work provides values of SMD at different distance from the nozzle tip depending on the specific parameters like injection pressure or discharge density. The values extracted from a combined experimental/computational approach have been compared to PDPA measurements under the same testing conditions. The results have shown that the maximum optical depth was higher than 10 and that an increase of the injection pressure led to higher  values. The SMD values appeared to be below the results measured by the PDPA and the droplet diameter showed to be the main responsible of the optical depth of the jet under the tested conditions.

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“…A change in the injection momentum affects the overall spray structure, 7 whereas the injection duration alteration influences the combustion efficiency and exhaust emissions. 14 In this study, ROI profiles of three injectors with nozzle hole diameter of 0.101, 0.122, and 0.133 mm operating at 140, 45, and 38 MPa, respectively, are shaped in a manner that their injection momentum and duration are similar. Diesel spray experiments are performed, and results are validated with computational and analytical approaches.…”

Section: Introductionmentioning

confidence: 98%

Effects of nozzle hole size and rail pressure on diesel spray and mixture characteristics under similar injection rate profile – experimental, computational and analytical studies under non-evaporating spray condition

Safiullah

Nishida

Ogata

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part D:

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In the present work, effects of nozzle hole size and rail pressure under non-evaporating spray condition are demonstrated. Three single hole injectors with the bore size of 0.101, 0.122, and 0.133 mm are experimented with injection pressures of 140, 45, and 38 MPa respectively to achieve similar injection rate profile. Diesel spray experiments implement Diffused Backlight Illumination Technique where diffused background is obtained for the High Speed Video camera imaging. Experimental results are then validated with computational and analytical studies. The CFD simulation requires the injection rate profile and spray cone angle as a primary input; thus, based on the High Speed Video Camera start of injection frame the 5 kHz Butterworth low-pass frequency filter is applied to the injection rate raw data. While, the spray cone angle is predicted using a simple model obtained from the relationship between the injection velocity, fluctuating velocity at the nozzle exit and total pressure loss factor of the injector. The experimental spray tip penetration of all three injectors is almost identical as the similar injection rate profile is adopted. Although, the mixture characteristics are better for 0.101 mm hole diameter since the smaller hole diameter with highest injection pressure depicts larger spray angle and better atomization. The computational study agrees with experiments qualitatively; however, the quantitative and qualitative agreements are seen in the analytical study.

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Influence of injection rate shaping on combustion and emissions for a medium duty diesel engine

Cited by 15 publications

References 20 publications

A Study on the Influence of Fuel Pipe on Fuel Injection Characteristics of Each Nozzle Hole in Diesel Injector

A Study on the Influence of Fuel Pipe on Fuel Injection Characteristics of Each Nozzle Hole in Diesel Injector

Determination of the optical depth of a DI diesel spray

Effects of nozzle hole size and rail pressure on diesel spray and mixture characteristics under similar injection rate profile – experimental, computational and analytical studies under non-evaporating spray condition

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