Transient Processes in Internal Combustion Engines P M V Subbarao Professor Mechanical Engineering Department Recognize the Role and Importance of Time.

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Presentation transcript:

Transient Processes in Internal Combustion Engines P M V Subbarao Professor Mechanical Engineering Department Recognize the Role and Importance of Time For Efficient Engine Operations….

First Law for A CV executing USUF for finite cycle time The True Cyclic Integration of I.C. Engine Processes The Cyclic Integral of CV Energy:

The Routine Inhalation of fresh air. Intake of diet. Compression of air. Digestion of intake with air. Generation of Mechanical Motion. Exhalation of waste. A cyclic creature called natural air breathing Machine. Actions are discrete but final outcome is continuous.

Most Crucial Event of A Routine Inhalation of fresh air. Depends on –Structure of Respiratory system. –Timing & Duration of Inhalation process. –Effectiveness of Exhalation process. –Is the start of Exhalation process rightly done?!?!?

First Law Analysis of Intake Process: USUF A I R FUEL A I R SI EngineCI Engine

Transient Flow through Intake & Exhaust Systems Exhaust Pipe

Flow Through Engine Intake System

The Complex Flow : Flow through Exhaust Valve

SI Engine CI Engine

Ideal Gas Equation for Intake Process

Breathing System of an Engine Structure of Hardware to have A Full Breath for Better Performance….

operational Strategies for Breathing A Major Compromise due to Strong Influence of time ! Efficient Space Management: 4-stroke cycle: Requires two complete revolutions to complete a cycle Efficient Time Management: 2-stroke cycle: Requires one complete revolution to complete a cycle

Strategies to Create Better Cylinder Environment at Start of Intake

The Four Stroke Cycle : An Obvious Choice

Two Stroke Cycle : A Smart Thinking!

(Wastage of Time) Wastage of Space Time - Space Compromise : Signatures of Perfect Breathing

(Wastage of Time) Wastage of Space Time - Space Compromise : Symptoms of Incomplete Breathing Naturally Aspirated Engines

Engine Variations for Better Breathing Air Intake Process Naturally aspirated Turbo charged Supercharged Crankcase compressed Mixture Preparation Carburetion Throttle body injection Multipoint fuel injection Direct or indirect fuel injection