Basic Principles of Ship Propulsion
- Details
- Category: General
- Published on Tuesday, 07 January 2014 03:43
- Hits: 1081
http://www.mandieselturbo.com/files/news/filesof5405/5510_004_02%20low.pdf
Contents
Introduction.................................................................................................. 5
Scope of this Paper...................................................................................... 5
Chapter 1..................................................................................................... 6
Ship Definitions and Hull Resistance.............................................................. 6
Ship types............................................................................................... 6
A ship’s load lines.................................................................................... 6
Indication of a ship’s size......................................................................... 7
Description of hull forms.......................................................................... 7
A ship’s resistance................................................................................... 9
Admiralty coefficient.............................................................................. 13
Chapter 2................................................................................................... 14
Propeller Propulsion.................................................................................... 14
Propeller types...................................................................................... 14
Flow conditions around the propeller...................................................... 15
Efficiencies............................................................................................ 16
Propeller thrust T and torque Q
B reacting on main engine....................... 17
Propeller dimensions and coefficients..................................................... 18
Manufacturing accuracy of the propeller................................................. 19
Slip ratio and propeller law..................................................................... 20
Heavy running of a propeller.................................................................. 22
Manoeuvring speed and propeller rotation.............................................. 26
Chapter 3................................................................................................... 27
Engine Layout and Load Diagrams.............................................................. 27
Power functions and logarithmic scales.................................................. 27
Propulsion and engine running points..................................................... 27
Engine layout diagram........................................................................... 29
Standard engine load diagram............................................................... 29
Extended engine load diagram............................................................... 31
Use of layout and load diagrams – examples with FP-propeller............... 32
Use of layout and load diagrams – example with CP-propeller................ 35
Influence on engine running of different types of ship resistance –
plant with FP-propeller........................................................................... 36
Influence of ship resistance on combinator curves –
plant with CP-propeller.......................................................................... 38
Constant ship speed line for increased propeller diameter...................... 38
Estimations of engine/propeller speed at SMCR for different single
screw FP-propeller diameters and number of propeller blades................ 40
Closing Remarks......................................................................................... 42
References................................................................................................. 42