Diesel Spray Atomization Model Considering Nozzle Exit Turbulence Conditions

Huh, Kang Y.; Lee, Eun‐Ju; Koo, Jaye

doi:10.1615/atomizspr.v8.i4.60

Cited by 67 publications

(43 citation statements)

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“…The only model we are aware of where tan θ /2 increases with We l0 is that of Skrebkov [5, p. 145], who suggests that (tan θ /2) 2 = Tu 2 0 + 12C ρ g /ρ l − 12/(DWe l0 ) for high Re l0 . The model of Huh et al [12] has no We l0 variation at all. The model of Tsyapko [7] is similar to Huh et al's, except for the addition of a term such that tan θ /2 is linear in Re l0 .…”

Section: Spray Angle θmentioning

confidence: 93%

“…In contrast, Skrebkov [5] and Huh et al [12] assume that a representative droplet diameter equals the integral scale Λ multiplied by a constant, avoiding problem 1 but not the others. However, as the integral scale is the largest turbulent scale, this seems plausible for only the largest droplet diameter.…”

Section: Previous Quantitative Theories Of Turbulent Jet Breakupmentioning

confidence: 99%

“…The experiments of Wu et al [9, p. 305] suggest that v d may scale with the radial turbulent RMS velocity v . Tsyapko [7] and Huh et al [12] developed spray angle θ models with this assumption. Rather than assuming this scaling, Skrebkov [5] used a energy balance including v to determine v d and θ .…”

Section: Previous Quantitative Theories Of Turbulent Jet Breakupmentioning

confidence: 99%

“…Similar to previous works [3,5,12], we define the spray angle through tan θ/2 ≡ v d /u d (for x = x i ), so to first-order tan θ /2 = v d / u d . As u d = U 0 + u, then u d U 0 because there is an additional term with the correlation uv .…”

Section: Spray Angle θmentioning

confidence: 99%

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Conditional damped random surface velocity model of turbulent jet breakup

Trettel¹

2018

Preprint

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A turbulent jet breakup model is derived using concepts from probability theory. Velocity fluctuations at the free surface are hypothesized to be the cause of turbulent jet breakup. We formalize this idea by treating the fluctuations as random variables, subject to damping from the free surface. In contrast to previous theories, we use a conditional ensemble average to determine quantities of interest because not all fluctuations produce droplets. An energy balance and a closure model are used to determine the Sauter mean diameter. Similar approaches are used to determine the breakup onset location, breakup length, and spray angle. A criteria for the transition to the turbulent atomization regime is derived under the hypothesis that the cause is a change in the minimum velocity from the Hinze scale to the Kolmogorov scale. To validate the model, we compiled data from previous experimental studies using long pipe nozzles. The little data for rough pipes was used to include turbulence intensity in our study.

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Section: Spray Angle θmentioning

confidence: 93%

Section: Previous Quantitative Theories Of Turbulent Jet Breakupmentioning

confidence: 99%

Section: Previous Quantitative Theories Of Turbulent Jet Breakupmentioning

confidence: 99%

Section: Spray Angle θmentioning

confidence: 99%

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Conditional damped random surface velocity model of turbulent jet breakup

Trettel¹

2018

Preprint

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“…It is well know that the outlet velocity has significant effects on the fuel spray [11]. Thus, it is necessary to investigate the influence of the fuel temperature on the outlet velocity.…”

Section: Influence On the Outlet Velocitymentioning

confidence: 99%

Numerical investigation of fuel temperature effects on the cavitation within a single-hole diesel nozzle

Wang¹,

Wang²

2015

Proceedings of the 2015 International Conference on Advances in Mechanical Engineering and Industrial Informatics

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Abstract. Based on Homogeneous Equilibrium Model combined with full cavitation model, the cavitation flow inside a single-hole diesel nozzle is simulated. In order to analyse the effect of the fuel temperature increase on the characteristics of the internal cavitating flow, the inception and development of cavitation inside the diesel nozzle were analysed separately. Furthermore, the effect on the outlet velocity was also discussed. The computational results show that the temperature rising had significant effects on the cavitation flow inside a diesel nozzle. With the rising of fuel temperature, the cavitation phenomenon inside the nozzle appeared earlier, the transition to supercavitation was accelerated and the outlet velocity increased.

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A new model based on coupling of MEP/CFD/ILIA for prediction of primary atomization

Hosseinalipour

Karimaei

2016

Can J Chem Eng

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The maximum entropy principle (MEP) is one of the first methods which was used to predict droplet size and velocity distributions of sprays. Due to some drawbacks of this model, the predicted results are not well matched with experimental data. This paper presents a different approach to improve the MEP model. It is suggested that improving the available energy source in the MEP model equation be made by numerical solution of the flow inside the injector based on CFD. This will enhance the accuracy of turbulent kinetic energy calculation of sprays. The forces acting on a liquid‐gas interface lead to the growth of disturbances originating inside the injector. In this paper, the instability analysis of wave motion on the surface of a swirling liquid sheet exposed to inner and outer gas streams is presented. However, the linear instability analysis used is different from prior analyses. A cylindrical annular liquid sheet was considered in previous studies, but in this study the instability theory is implemented on a cone‐shaped annular liquid sheet for different cone angles. Applying these procedures enhances the model predictions. The liquid sheet properties found by CFD analysis and the results of improved linear instability analysis (ILIA) are also applied to calculate the momentum source in the MEP model. By coupling these models, the MEP model can be run independently of experimental data. The proposed model was applied to predict the droplet size and velocity distributions of a hollow‐cone spray. The results show close agreement with experimental data.

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Diesel Spray Atomization Model Considering Nozzle Exit Turbulence Conditions

Cited by 67 publications

References 0 publications

Conditional damped random surface velocity model of turbulent jet breakup

Conditional damped random surface velocity model of turbulent jet breakup

Numerical investigation of fuel temperature effects on the cavitation within a single-hole diesel nozzle

A new model based on coupling of MEP/CFD/ILIA for prediction of primary atomization

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