Experimental and Numerical Study of Swirling ... - Solid Mechanics
Experimental and Numerical Study of Swirling ... - Solid Mechanics Experimental and Numerical Study of Swirling ... - Solid Mechanics
Experimental and Numerical Study of Swirling Flow in Scavenging Process for 2-Stroke Marine Diesel Engines LDV/ LDA Laser Doppler Velocimetry/ Anemometry NOx Oxides of Nitrogen NO and NO2 (air pollutants) PVC Precessing vortex core SPIV Stereoscopic Particle Image Velocimetry TDC Top Dead Center T.I Turbulence Intensity TKE Turbulent Kinetic Energy
Experimental and Numerical Study of Swirling Flow in Scavenging Process for 2-Stroke Marine Diesel Engines Table of Contents 1 Introduction ................................................................................................... 1 1.1 Large Two-Stroke Marine Diesel Engine ............................................................... 1 1.1.1 Two-Stroke Diesel Engine Cycle ............................................................................ 2 1.2 Significance of Scavenging Process ........................................................................ 3 1.3 Types of Scavenging Systems ................................................................................. 5 1.3.1 Cross Scavenging ................................................................................................... 5 1.3.2 Loop Scavenging .................................................................................................... 5 1.3.3 Uniflow Scavenging ............................................................................................... 6 1.4 Comparison of Scavenging Types and Ideal Engine Scavenging Process ............... 6 1.5 Swirling Flow during Uniflow Scavenging Process ................................................ 7 1.6 Scope of thesis ........................................................................................................ 9 1.7 Thesis Layout ....................................................................................................... 10 2 Swirling Flows .............................................................................................. 11 2.1 Classification of Confined Swirling Flows ...........................................................12 2.2 Methods of Swirl Generation .............................................................................. 16 2.3 Some Aspects of Swirling Flows ............................................................................ 18 2.3.1 Stream line Curvature ......................................................................................... 18 2.3.2 Radial Equilibrium ............................................................................................. 19 2.3.3 Swirl Intensity and Decay ................................................................................... 20 2.3.4 Upstream influence ............................................................................................. 22 2.3.5 Instabilities Vortex Breakdown in swirling Flows ............................................... 23
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<strong>Experimental</strong> <strong>and</strong> <strong>Numerical</strong> <strong>Study</strong> <strong>of</strong> <strong>Swirling</strong> Flow in Scavenging Process for 2-Stroke<br />
Marine Diesel Engines<br />
LDV/ LDA Laser Doppler Velocimetry/ Anemometry<br />
NOx Oxides <strong>of</strong> Nitrogen NO <strong>and</strong> NO2 (air pollutants)<br />
PVC Precessing vortex core<br />
SPIV Stereoscopic Particle Image Velocimetry<br />
TDC Top Dead Center<br />
T.I Turbulence Intensity<br />
TKE Turbulent Kinetic Energy
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