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Kinematics Vs Transient Thermal Processes for I.C. Engines

Explore the effects of stroke length on engine kinematics and instantaneous volumes of the thermodynamic system. Understand the compression ratio, cylinder bore-to-stroke ratio, and kinematic rod ratio for engine optimization.

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Kinematics Vs Transient Thermal Processes for I.C. Engines

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  1. Kinematics Vs Transient Thermal Processes for I.C. Engines P M V Subbarao Professor Mechanical Engineering Department Intelligence to Control Method & Pace of EngineCycle actualization ….

  2. Effect of Stroke Length on Engine Kinematics Instantaneous Piston Displacement:

  3. Minimum, Maximum & Instantaneous Volumes of Thermodynamic System

  4. Instantaneous Cylinder Volume Instantaneous volume of the Thermodynamic system Instantaneous Surface area of the Thermodynamic system For a given displacement volume, Vd & squareness, RBS

  5. Displacement Volume at Any Crank Angle

  6. Displacement Volume at Any Crank Angle Relative location of piston center w.r.t . Crank Axis at any crank angle

  7. Instantaneous Engine Cylinder Volume

  8. Instantaneous Displacement Volume & Compression Ratio

  9. Engine Geometric Ratios Engine Compression Ratio Cylinder Bore-to-Stroke Ratio Kinematic Rod Ratio

  10. Define Rod ratio

  11. The Geometrical Description of Engine Cylinder

  12. Instantaneous non-dimensional Displacement Volume Rod ratio

  13. Instantaneous Cylinder Volume : Dynamic Cylinder Volume

  14. Instantaneous Thermodynamic Parameters

  15. Trending of Current Practice: Bore/Stroke Ratio Bore – to –Stroke Ratio

  16. Extreme Limits of RB • The extremes to this relationship is the inertial forces originating from the piston motion. • To achieve high power density, the engine must operate at a high engine speed (up to 18,000 rpm for the Formula 1 engine), which leads to high inertial forces that must be limited by using a large bore-to-stroke ratio. • For applications that demand high efficiency requires a slower engine speed and lower power density. • And hence, a small bore-to-stroke ratio is necessary, again because of the inertial forces of the piston, • For the marine application that has a 2.5 m stroke, the engine speed is limited to 102 rpm.

  17. The Ineresting News • The world’s biggest engine is the Wärtsilä-Sulzer RTA96. • It’s the largest internal combustion engine ever built by man. • Wärtsilä-Sulzer RTA96-C is a 14-cylinder, turbocharged diesel engine that was specially designed to power the Emma Maersk which is owned by the Danish Maersk. • Wärtsilä-Sulzer RTA96, the world’s biggest engine, has a weight of 2.3 million kilogrammes. • If the weight of the average adult person is 70 kgs, this world’s biggest engine has a weight equivalent to the weight of 33,000 people.

  18. Wärtsilä-Sulzer RTA96-C

  19. Economies of Scale in Sea Transportation • Maersk Lines have done the world proud by providing cheap sea transportation that is costing cents instead of a dollar per every kg weight. • They are able to do this by using economies of scale in sea transportation. • It is getting cheaper to ship goods from USA to China and from China to USA. • It has now become cheaper to transport goods from China to a US port than to transport the same goods from a US port to the final destination inland of US by a truck.

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