Measurement and modeling of the near-nozzle ambient gas entrainment of high-pressure diesel sprays

Wei, Yijie; Li, Tie; Chen, Run; Wang, Xinran

doi:10.1016/j.fuel.2021.122373

Cited by 14 publications

(5 citation statements)

References 20 publications

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“…Simultaneously, the spray is transferring its momentum to the air leading to further dispersion of the spray. This is called the air entrainment effect [62][63][64][65][66].…”

Section: Spray Atomizationmentioning

confidence: 99%

“…Simultaneously, the spray is transferring its momentum to the air leading to further dispersion of the spray. This is called the air entrainment effect [62][63][64][65][66]. Large angle spray is favored and is formed by short spray core and break-up length.…”

Section: Spray Atomizationmentioning

confidence: 99%

“…Ambient pressure, along with density, have a great influence on macroscopic attributes of the spray [113][114][115][116][117]. Additionally, the rise in ambient density could reduce the length of spray penetration as well as widen the angle of the spray cone [39,65,114,118,119]. The ambient temperature primarily affects the spray behavior in terms of its evaporation rate, both microscopically and macroscopically.…”

Section: Factors Affecting Spray Evolutionmentioning

confidence: 99%

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Diesel Spray: Development of Spray in Diesel Engine

Djamari

Idris²,

Paristiawan³

et al. 2022

Sustainability

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Research and development in the internal combustion engine (ICE) has been growing progressively. Issues such as air pollution, fuel cost, and market competitiveness have driven the automotive industry to develop and manufacture automobiles that meet new regulation and customers’ needs. The diesel engine has some advantages over the gasoline or spark ignition engine, including higher engine efficiency, greater power output, as well as reliability. Since the early stage of the diesel engine’s development phase, the quest to obtain better atomization, proper fuel supply, and accurate timing control, have triggered numerous innovations. In the last two decades, owing to the development of optical technology, the visualization of spray atomization has been made possible using visual diagnostics techniques. This advancement has greatly improved research in spray evolution. Yet, a more comprehensive understanding related to these aspects has not yet been agreed upon. Diesel spray, in particular, is considered a complicated phenomenon to observe because of its high-speed, high pressure, as well as its high temperature working condition. Nevertheless, several mechanisms have been successfully explained using fundamental studies, providing several suggestions in the area, such as liquid atomization and two-phase spray flow. There are still many aspects that have not yet been agreed upon. This paper comprehensively reviews the current status of theoretical diesel spray and modelling, including some important numerical and experimental aspects.

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“…Simultaneously, the spray is transferring its momentum to the air leading to further dispersion of the spray. This is called the air entrainment effect [62][63][64][65][66].…”

Section: Spray Atomizationmentioning

confidence: 99%

Section: Spray Atomizationmentioning

confidence: 99%

Section: Factors Affecting Spray Evolutionmentioning

confidence: 99%

See 1 more Smart Citation

Diesel Spray: Development of Spray in Diesel Engine

Djamari

Idris²,

Paristiawan³

et al. 2022

Sustainability

View full text Add to dashboard Cite

show abstract

“…Therefore, increasing injection pressure and reducing nozzle diameter are effective methods to enhance fuel atomization and accelerate mixing in diesel engines. The 0-Dimensional (0-D) model is extensively employed in predicting spray and combustion characteristics due to its cost-effectiveness, minimal input parameters, and time efficiency [16,17]. Accurately predicting spray tip penetration is crucial for engine structural design and fuel injection strategy.…”

Section: Introductionmentioning

confidence: 99%

Investigations on the Diesel Spray Characteristic and Tip Penetration Model of Multi-Hole Injector with Micro-Hole under Ultra-High Injection Pressure

et al. 2023

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Increasing the injection pressure has a significant impact on atomization and combustion characteristics. Spray tip penetration serves as a vital parameter for fuel injection control and engine structure design. However, a reliable spray tip penetration model for ultra-high-pressure injection is currently lacking. To address this gap, this study establishes a theoretical 0-dimensional model for spray tip penetration under ultra-high pressure (300 MPa) conditions. The model is based on the conservation of momentum and phenomenological models. The new model divides spray tip penetration into two stages: Pre-breakup and post-breakup, with fuel injection rate and spray cone angle used as model inputs. To validate the model, high-speed camera observations and constant-volume chamber experiments are conducted to investigate the spray characteristics. The results indicate that the new spray tip penetration model demonstrates improved predictive accuracy across all experimental conditions.

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“…1,5,6 Previously, a number of research were mainly focusing on the global spray process over a wide range of boundary conditions, including P inj , ambient density (r ambient ), fuel properties, and nozzle geometry and so on. 4,[7][8][9][10][11][12][13][14][15] Herein, the main focuses are the characteristics of spray-induced shock waves and their effects on the spray development. MacPhee et al 16 observed oblique shock waves ahead of the spray tip, and indicated that the pilot injection could reduce the local sound speed and increase the possibility of the generation of shock waves during the main injection.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on effect of gas/spray interactions on transient diesel spray behaviors

Wang

et al. 2023

International Journal of Engine Research

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The ever-increasing rail pressure in diesel engines may cause the injection induced shock waves. In the present study, different gases (N2 and CO2) were used as the ambient mediums in order to understand the effect of shock waves induced by the high-speed jets on the near-field spray penetration. The tests were carried out in an optically-accessible constant volume vessel and a single-hole diesel injector was used. The injection pressure ( Pinj) ranged from 80 to 150 MPa and the ambient density ( ρambient) are 11.25, 22.52, and 33.81 kg/m3, respectively. Schlieren imaging was used to capture the shock waves ahead of the sprays with a frame speed of 100,000 fps and high-speed imaging was used to capture the spray penetration evolution with a frame speed of 300,000 fps in order to provide sufficient high temporal and spatial resolutions of the spray development. Shock waves can be observed under CO2 atmosphere over all the tested conditions and almost invisible under N2 atmosphere. The timings of occurrence and detachment of the shock waves are advanced with the increase in ρambient, but less sensitivity to Pinj. The difference in penetration lengths for N2 and CO2 atmosphere are not consistent as Pinj and ρambient varied, indicating the complicated role of shock waves in influencing the spray behaviors. Several mechanisms for the generation of shock waves were discussed, as well the physical meaning of the timing to the peak velocity of the spray tip with breakup time.

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Measurement and modeling of the near-nozzle ambient gas entrainment of high-pressure diesel sprays

Cited by 14 publications

References 20 publications

Diesel Spray: Development of Spray in Diesel Engine

Diesel Spray: Development of Spray in Diesel Engine

Investigations on the Diesel Spray Characteristic and Tip Penetration Model of Multi-Hole Injector with Micro-Hole under Ultra-High Injection Pressure

Experimental investigation on effect of gas/spray interactions on transient diesel spray behaviors

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