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

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