A Tentative Mass Loss Model for Simulating Water Droplet Splash

Tan, Chiong

doi:10.2514/6.2004-410

Cited by 18 publications

(14 citation statements)

References 4 publications

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“…Some important results were also obtained by numerical method. The method of impingement property calculation could be divided into Lagrange method [5][6] and Euler method [7][8][9]. The Lagrange method could capture the deformation of single droplet.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Super-cooled droplet impingement on Aeroengine

Tan

Wei

2020

mech

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In this work, a large bypass ratio engine was taken as the research object. The impingement property of droplets with various diameters including SLD (Super-cooled Large Droplet) was obtained by Euler method based on Mundo model. The grid models of nose cone, fan, guild vanes in bypass duct and core duct were established in segments firstly. The mixed boundary was used to realize the data exchange between different flow fields. Then the Spalart-Allmaras turbulence model was applied to calculate the three dimensional engine flow field. Based on the flow field result, the droplet trajectory was calculated by Euler multiphase flow method. The LWC (Liquid Water Content), droplet collection efficiency and the effect of droplet diameter on impingement law were obtained. The method used in this paper and results could provide some references for subsequent engine icing calculation and anti-icing system design.

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Section: Introductionmentioning

confidence: 99%

Numerical Study of Super-cooled droplet impingement on Aeroengine

Tan

Wei

2020

mech

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“…1. Especially in mixed-phase clouds, droplets of much larger size can be encountered [3]. The MVD for these droplets can be on the order of 100 m. These droplets do not comply with the aforementioned assumptions and cause unpredictable ice shapes due to different underlying mechanisms.…”

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confidence: 96%

“…For either case, a droplet tracing is necessary to predict the consequences. To compute the droplet trajectory, the following assumptions are generally used [3]: 1) Flowfield and the droplets are decoupled, and so the droplets do not alter the flow.…”

mentioning

confidence: 99%

Investigation of Relative Humidity and Induced-Vortex Effects on Aircraft Icing

Ogretim¹,

Huebsch²,

Narramore³

et al. 2007

Journal of Aircraft

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Two new mechanisms for downstream ice growth (i.e., downstream of the primary ice shape) in aircraft icing scenarios were investigated. The first mechanism is local variation of relative humidity with its potential for water deposition due to supersaturation. The second mechanism is induced-vortex effects due to their potential impact on droplet paths. It was shown that for rough surfaces with an extended period of exposure, relative humidity effects can lead to additional growth. The resultant frost is a sandpaperlike roughness that can severely degrade the aerodynamic performance of the wings. It was also shown that the vortices induced by the existing ice-shape features are capable of altering the droplet paths. As a result, impingements occur beyond the limits predicted by the methods in other icing prediction codes.Nomenclature a x , a y = nondimensional acceleration component in the x and y directions a 0 , a 0 = acceleration component in the 0 and 0 directions a = reference value for the nondimensionalization of acceleration C p = pressure coefficient, P P 1 = 1 2 air V 2 1 c = chord length D = diffusivity of water vapor in air, m 2 =s e, e = actual and saturation vapor pressure, respectively, mbar h = height of the roughness element K = thermal conductivity of water, J=m s K L = latent heat of vaporization for water, 2:5 10 6 J=kg LER = leading-edge radius, m LWC, VWC = liquid and vapor water content, respectively, in kilograms of water per cubic meter of air MVD = median volumetric diameter, m N = number of droplets in 1 m 3 of air P = static pressure, Pa (unless otherwise stated) R v = specific gas constant for water vapor, 461 J=kg K RH w , RH ice = relative humidity with respect to liquid water and ice, respectively r = radius of the droplet, m S = cross-sectional area of a sphere, m 2 s d = separation between two neighboring droplets, m T = static temperature, K t = reference value for the nondimensionalization of time V 1 = velocity of the approaching flow v x , v y = nondimensional velocity component in the x and y directions v 0 , v 0 = velocity component in the 0 and 0 directions w = mixing ratio of water vapor and dry air = ratio of the specific heats air , v = density of dry air and water vapor, respectively, kg=m 3 water = density of liquid water, kg=m 3 = stream function

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“…. At the same time, Tan [2004] and Tan & Papadakis [2005] proposed the WSU model which was obtained by applying appropriate curve-fit equations to the predicted droplet impingement efficiency. However, this model is not widely used since it requires a high level of detail of the key parameters in the model correlations.…”

Section: A C C E P T E D Mmentioning

confidence: 99%

“…Comparing with Eulerian approach, one major limit of the Lagrangian one is the computational cost associated to the necessity of using a lot of droplets. However, the Lagrangian approach is also preferred in SLD conditions as it can capture single droplet deformation, splashing and bouncing effects [Tan, 2004;Wright & Potapczuk, 2004] This approach applies to the single droplet when it hits the surface and the quantity of the droplet mass stick and reflect at the impinging point was recorded for each impaction. In this work, the droplet tracking method was adapted to calculate the droplet impingement efficiency under the condition of the droplet splashing and reimpingement.…”

Section: A C C E P T E D Mmentioning

confidence: 99%