Experimental and Numerical Study of Swirling ... - Solid Mechanics

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Experimental and Numerical Study of Swirling Flow in Scavenging Process for 2-Stroke Marine Diesel Engines A Area A in Inlet area A i Total area of inlet to the cylinder/ nozzle area D Internal diameter of cylinder or vortex chamber Do External diameter of cylinder or vortex chamber De Internal diameter of outlet pipe d Diameter of conditional circle c I Turbulence intensity k Turbulent kinetic energy L Length of cylinder or vortex chamber Le Length of outlet pipe l l p Length scale representing size of largest eddy Helix pitch Pressure Q Q in r r a Inlet volume flow rate Inlet volume flow rate Radial distance from the center of vortex Radial distance from vortex center to location with maximum tangential velocity R Radius of the cylinder/ vortex chamber Re Reynolds number S Swirl number/ parameter S o Initial swirl intensity S c Characteristic swirl number Vav Average velocity V Normalized tangential velocity Vr Normalized radial velocity Vz Normalized axial velocity v Tangential velocity v r Radial velocity v Axial velocity a Nomenclature
Experimental and Numerical Study of Swirling Flow in Scavenging Process for 2-Stroke Marine Diesel Engines vv i j Reynolds stress components vv i j Normalized Reynolds Stress components in polar coordinates uu i j Normalized Reynolds Stress components in Cartesian coordinates X X-axis based on its origin at axis of the test cylinder Xv X-axis based on its origin at mean vortex center x X-axis based on its origin at axis of the test cylinder computational mesh and for experimental data it represents Xv. Greek Symbols and Notations Angular Velocity Circulation around the vortex core Length scale representing the effective size of vortex core Density Energy dissipation Angle between radial and tangential velocity components Diameter of the circle having blade curvature as an arc Angle between cylinder radius and direction of nozzle/ inlet Energy dissipation Streamline angle Rate of swirl decay t Turbulent viscosity t Turbulent viscosity without swirl 0 s Model swirl constant z Mean axial vorticity Mean tangential vorticity Subscripts i, j Vector components in Cartesian and Polar coordinates m Model quantity Abbreviations BDC Bottom Dead Center CFD Computational Fluid Dynamics IMO International Marine Organization LSE Low Speed Engine
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DTU Mechanical Engineering Section
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Experimental and Numerical Study of Swirling ... - Solid Mechanics

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