Marine Diesel Engines II

At the end of this course, the students should be able to: 1. explain the procedures for engine performance determination and improvement; 2. describe low-speed diesel engines with respect to operations, starting air system, maneuvering, running in service, etc.; 3. recommend safety checks and devices as to preclude mishaps such as crankcase explosion and scavenge fire; 4. explain the dynamics of engine components, their vibrations and attenuation; and 5. highlight the fundamentals of tribology, i.e., bearings, seals and lubrication.

Engine performance: indicator, scavenging and supercharging turbocharging and turbochargers. Operation of low-speed engines starting air system and reversing mechanism. Controls and instrumentation. Starting (normal and stopping) operations. Overload operation. Maneuvering. Minimum speed operation in specific conditions. Typical operating troubles. Running in service safety devices. Dynamics of crank gear. Vibration: simple system, torsional, multi-cylinder crankshaft system: imbalance correction. Energy balance and engine efficiency calculations. Various cooling systems in I.C. engines; their merits and demerits. Safety and prevention of mishaps in I.C. Engines: causes and prevention of crank-case explosion and Scavenge fires. Detection of hazard and safety fittings provided to prevent damage. Fuel combustion in I.C. engines and air-fuel ratio. Grades of suitable fuels, preparation of fuels for efficient combustion. Fuel atomization and requirements of fuel injectors. Design aspects of combustion chamber. Fundamentals of tribology. Lubrication: theories, classification and characteristics. Types of lubricants: fluid and solid; their properties, applications, additives and limitations. Bearings and seals; theories, types and applications.