Cylinder Kinematics : A Thinking Process of Artificial Animals P M V Subbarao Professor Mechanical Engineering Department Means to Control Displacement,

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Presentation transcript:

Cylinder Kinematics : A Thinking Process of Artificial Animals P M V Subbarao Professor Mechanical Engineering Department Means to Control Displacement, Velocity & Accelerations of Cylinder Processes….

The Art of Positive Displacement Work Displacement of system provokes the process. The rate of change in instantaneous controls, decides the rates of changes of other thermodynamic variables. The brain of an animal controls the strain rates in Muscles….. How to design the basic brain of these devices?

Control Dominates the Strength

Control System of A Conventional I.C. Engine Primary Thermodynamic Requirement: How to select other geometrical parameters?

Engine Geometry Vs Otto Cycle

Maximum Otto Cycle Volume to meet the Demand

Engine Geometry Vs Diesel Cycle

Maximum Diesel Cycle Volume to meet the Demand

Cycle Volume Vs Cylinder Volume A given cycle can be met using m number of multiple cylinders if required. Any restriction on stroke length can be satisfied by using multi-cylinder engine. Why is this required?

Review of History Gottlieb Daimler built an improved four-stroke engine with mushroom-shaped valves and two V-slant cylinders Wilhelm Maybach built the first four-cylinder, four- stroke engine.

Effect of Stroke Length on Engine Kinematics

Engine Cylinder Geometry Squareness of the engine cylinder: R BS

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

Optimum Cylinder Geometry Identification of the optimum engine geometry that provides the best opportunity to have a highly efficient internal combustion engine is the first step in designing an engine. In-cylinder simulations have shown that the heat transfer increases rapidly above a bore-to-stroke ratio of about 0.5. Engine systems simulations have shown that the pumping work increases rapidly above a bore-to-stroke ratio of about Engine friction models have shown that the crankshaft bearing and power-cylinder friction values, for the most part, cancel each other out for our opposed-piston, two- stroke engine.