Modeling Oil Flows in Engine Sumps: Drop Dynamics and Wall Impact Simulation

A computational preliminary design tool has been developed to help simulate drop-related processes that take place in an oil sump of a gas turbine engine accounting for drop motion, deformation, breakup, and drop/wall interactions including wall film impact and potential splashing. Aerodynamic interactions with the gas phase are considered using an exact solution of the Navier-Stokes equations to approximate the annular gas flow. Detailed results for the baseline case that attempts to replicate the conditions found in a typical oil sump of a turbofan engine are presented. In addition, the results of more general parametric studies utilizing a simplified geometry that investigated the effects of changing various parameters are discussed.

[1]  B. J. Mason,et al.  The coalescence and bouncing of water drops at an air/water interface , 1964, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[2]  J. Rodríguez,et al.  Some remarks about the spreading pressure of the mixed monolayer without lateral interaction , 1985 .

[3]  Z. Dai,et al.  Temporal properties of secondary drop breakup in the multimode breakup regime , 2001 .

[4]  Francisco J. Rodríguez,et al.  Some drops don't splash , 1985 .

[5]  Cameron Tropea,et al.  Numerical and experimental investigation of spray characteristics in the vicinity of a rigid Wall , 1997 .

[6]  Rolf D. Reitz,et al.  MECHANISMS OF AIR-ASSISTED LIQUID ATOMIZATION , 1993 .

[7]  J. Nicholls,et al.  Aerodynamic shattering of liquid drops. , 1968 .

[8]  L. Wachters,et al.  The heat transfer from a hot wall to impinging water drops in the spheroidal state , 1966 .

[9]  A. J. Przekwas,et al.  Modeling of spray droplets deformation and breakup , 1993 .

[10]  C. Stow,et al.  The Physical Products of a Splashing Water Drop , 1977 .

[11]  Rolf D. Reitz,et al.  BREAKUP MECHANISMS AND DRAG COEFFICIENTS OF HIGH-SPEED VAPORIZING LIQUID DROPS , 1996 .

[12]  R. Reitz,et al.  Modeling the effects of drop drag and breakup on fuel sprays. Technical paper , 1993 .

[13]  Peter J. O'Rourke,et al.  A Spray/Wall Interaction Submodel for the KIVA-3 Wall Film Model , 2000 .

[14]  A. Gosman,et al.  Development of Methodology for Spray Impingement Simulation , 1995 .

[15]  A. A. Amsden,et al.  KIVA-II: A Computer Program for Chemically Reactive Flows with Sprays , 1989 .

[16]  M. Clark.  Drop breakup in a turbulent flow. I: Conceptual and modeling considerations , 1988 .

[17]  Rolf D. Reitz,et al.  Modeling Engine Spray/Wall Impingement , 1988 .

[18]  Peter J. O'Rourke,et al.  The TAB method for numerical calculation of spray droplet breakup , 1987 .

[19]  C. Tropea,et al.  Evaluation of drop impingement models experimental and numerical analysis of a spray impact , 1999 .

[20]  Cameron Tropea,et al.  On the modeling of liquid sprays impinging on surfaces , 1998 .

[21]  Cameron Tropea,et al.  MODELING OF SPRAY IMPACT ON SOLID SURFACES , 2000 .

[22]  Christopher J. Rutland,et al.  MODELING FUEL FILM FORMATION AND WALL INTERACTION IN DIESEL ENGINES , 1996 .

[23]  Christopher J. Rutland,et al.  MULTI-DIMENSIONAL MODELING OF HEAT AND MASS TRANSFER OF FUEL FILMS RESULTING FROM IMPINGING SPRAYS , 1998 .

[24]  C. Tropea,et al.  Droplet-wall collisions: Experimental studies of the deformation and breakup process , 1995 .

[25]  A. Yarin,et al.  Impact of drops on solid surfaces: self-similar capillary waves, and splashing as a new type of kinematic discontinuity , 1995, Journal of Fluid Mechanics.