## OMV551 Syllabus - Marine Propulsion - 2017 Regulation - Open Elective | Anna University

OMV551

MARINE PROPULSION

L T P C

3003

OBJECTIVE: On completion of the course the students are expected to have the knowledge on the
• Various types of Propulsion systems, Propeller geometry
• Propeller theory, propeller operating environment
• Interaction between hull and the propeller
• Performance and maintenance of propellers

UNIT I

PROPULSION SYSTEMS AND PROPELLER GEOMETRY

9

Fixed pitch propellers, Ducted propellers, Podded and azimuthing propulsions, Contra rotating propellers, Over lapping propellers, Tandem propellers, Control label pitch propellers, Water jet propulsion, Cycloidal propellers paddle wheels, Magneto hydro dynamic propulsion, Super conducting motors for marine propulsion. Frames of references, Propeller reference lines, Pitch, Rake and skew, Propeller outlines and area, Propeller drawing methods Section geometry and definition, Blade thickness distribution and thickness fraction, Blade interference limits for controllable pitch propellers, Controllable pitch propeller off-design section geometry.

UNIT II

PROPELLER ENVIRONMENT & PERFORMANCE CHARACTERISTICS

9

Density of water, Salinity, Water temperature, Viscosity, vapour pressure, Dissolved gases in sea water, Surface tension, Weather, Silt and marine organisms.

UNIT III

PROPELLER THEORY, CAVITATION & NOISE

9

Momentum theory – Ranking, R.E. Froude, Blade element theory – Propeller Theoretical development. The basic physics of cavitation, Types of cavitation experienced by propellers, Cavitation considerations in design, Cavitation inception, Cavitation –induced damage, Cavitation testing of propellers, Analysis of measured pressure data from a cavitating propeller, Propeller – rudder interaction. Physics of underwater sound, Nature of propeller noise, Noise scaling relationships, Noise prediction and control.

UNIT IV

PROPELLER – SHIP INTERACTION, SHIP RESISTANCE AND PROPULSION

9

Bearing forces, Hydro dynamic interaction, Froude’s analysis procedure, Components of calm water resistance, Methods of resistance evaluation, Propulsive coefficients, The influence of rough water, Restricted water effects, High – speed hull form resistance, Air resistance.

UNIT V

SERVICE PERFORMANCE, TOLERANCE AND MAINTENANCE

9

Effects of weather, Hull roughness and fouling, Hull drag reduction, Propeller roughness and fouling, Generalized equations for the roughness – induced power penalties in ship operation, Monitoring of ship performance. Propeller tolerances, Propeller inspection, Causes of propeller damage, Propeller repair, Welding and the extent of weld repairs, stress relief

TOTAL: 45 PERIODS

OUTCOMES: At the end of the course the :
• Students have the capability to understand the types of marine Propellers and its material.
• Students have the ability to design and select the propellers for various types of ships.
• Students have the skill to repair the propellers.

TEXT BOOKS:
1 John Carlton, Marine Propellers and Propulsion, (2ndEdition) published by Elsevier limited, 2007