Numerical Simulation of the Cavitating Flow in an Elliptical Nozzle

Hong, Jung Goo; Ku, Kun Woo; Lee, Choong-Won

doi:10.1615/atomizspr.2011003127

Cited by 15 publications

(4 citation statements)

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“…This analysis was done to observe the process of fluid breaking. In the case of non-circular orifices, the axis-switching phenomenon is observed only at low pressures, as reported by hong et al 13 . Low-pressure analysis was done for non-circular orifices to capture these phenomena.…”

Section: Low-pressure Analysissupporting

confidence: 73%

“…The atomization efficiency is very less and it leads to the reduced combustion efficiency of the system. Attempts have been made by the researchers to address these issues by varying the injector orifices shape from circular to non-circular orifices in addition with an appropriate L/D (length to diameter) ratio [10][11][12][13][14][15][16] .…”

Section: Introductionmentioning

confidence: 99%

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Studies of Jet A1 Fuel Atomization Through Non Circular Orifices

Pooja,

Kumar

2023

Def. Sc. J.

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The performance of the liquid rocket engine depends on the atomization behavior of the fluid being injected into the combustion chamber. Generally, a plain injector with a circular orifice has been used in the injector, but it has the disadvantage of having a low spray cone angle. The breakup length, mean droplet diameter, and Sauter mean diameter is also higher. Thus, to overcome these drawbacks, non-circular orifices have been utilized in the present study. The shapes used for non-circular orifices are semi-circular and plus. The results obtained with the non-circular orifice is compared with the circular orifices of the same area ratio. The working fluid used for the studies is Jet A1 fuel. Studies were also conducted with different L/D ratios by choosing an effective orifice length to reduce the upstream losses. The axis-switching phenomena were observed with the semi-circular as well as with the plus jets. The mean droplet size of the circular jets was more prominent compared to non-circular jets, and the Sauter mean diameter of non-circular jets droplets was smaller than that of the circular jet droplet. The spray cone angle has increased by 290% for plus jets and 30% for semi-circular jets compared to circular jets.

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Section: Low-pressure Analysissupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Studies of Jet A1 Fuel Atomization Through Non Circular Orifices

Pooja,

Kumar

2023

Def. Sc. J.

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“…However, the restricted bubble collapsing near the elliptical walls, as a type of curved wall with different curvatures, have not been investigated yet. And, the elliptical walls often appear in various fluid machinery operating conditions, such as elliptical hydrofoils [34] , [35] , elliptical nozzles [36] , and elliptical bearings [37] , [38] . These elliptical components have special functions, such as the elliptical bearings are conducive to the stable operation of the journal bearings and the elliptical nozzles affect the characteristics of the spray, and often exist in narrow channels.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the effects of an elliptical wall on the dynamic behaviors of a bubble restricted by two parallel plates

Shen,

Li,

Wang

et al. 2024

Ultrasonics Sonochemistry

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“…Ho and Gutmark [13] found that the elliptical jet had a better air entrainment ratio than that of the circular jet. Hong et al [14,15] also investigated the effects of the non-circular hole on the cavitation and spray patterns with a large transparent nozzle at room temperature. The results indicated that when the cavitation appeared in the elliptical hole, the elliptical spray cone angle became larger than the circular spray.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Elliptical Diesel Nozzles on Spray Liquid-Phase Penetration under Evaporative Conditions

Yin

Jia

et al. 2020

Energies

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Elliptical diesel nozzles affect the fuel–air mixing process, and thus combustion and exhaust emissions. Experiments were conducted to study biodiesel spray liquid-phase behaviors for elliptical and circular nozzles through the Mie-scattering method under evaporative conditions. Based on the measurements, the results show that the elliptical nozzle spray liquid-phase penetration is smaller than the circular one under steady-state conditions. The deformation and the axis-switching behaviors of the elliptical jet are helpful in accelerating the breakup of the liquid core. Moreover, the injection pressure has little impact on the penetration of the liquid-phase spray for either geometrical orifice. Additionally, increasing the ambient temperature can reduce the penetration of liquid-phase spray, because an increase in temperature increases the rate of evaporation. The differences in steady liquid-phase penetration between circular and elliptical sprays decrease as the ambient temperature increases. Additionally, increasing the backpressure can decrease the liquid-phase penetration. The differences in steady liquid-phase penetration between circular and elliptical nozzles are reduced with the increase in backpressure, probably due to the axis-switching and deformation behaviors of the elliptical jet being restrained under high-backpressure conditions. Finally, the application of an elliptical orifice is beneficial for decreasing the spray liquid-phase penetration, and thus avoiding the fuel impingement in small engine combustion chambers. The lower liquid-phase penetration for elliptical spray indicated higher fuel and air mixture quality, which is helpful for reducing the diesel engine exhaust soot emissions.

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Numerical Simulation of the Cavitating Flow in an Elliptical Nozzle

Cited by 15 publications

References 0 publications

Studies of Jet A1 Fuel Atomization Through Non Circular Orifices

Studies of Jet A1 Fuel Atomization Through Non Circular Orifices

Investigation on the effects of an elliptical wall on the dynamic behaviors of a bubble restricted by two parallel plates

The Effect of Elliptical Diesel Nozzles on Spray Liquid-Phase Penetration under Evaporative Conditions

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