Air Flow Management in Automotive Prime Movers

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Presentation transcript:

Air Flow Management in Automotive Prime Movers P M V Subbarao Professor Mechanical Engineering Department Efficient & Reliable Inhalation is Essential for Healthy Operation of Engine….

Selection of Mixture Strength Air Standard Model Fuel-air Model Actual Performance curve

Selection of Mixture Strength Air Standard Model Fuel-air Model Actual Performance curve

Selection of Sufficient Air : Running Cost Vs Capital Cost

Analysis of Intake Process FUEL A I R SI Engine CI Engine

Analysis of Intake Process : Current SI Engine FUEL

Analysis of Intake Process : Current CI Engine

Hardware for Air Intake Valve/Port Design 1. Poppet Valve 2. Rotary Valve 3. Reed Valve 4. Piston Controlled Porting Valve Location 1. The T-head 2. The L-head 3. The F-head 4. The I-head: (i) Over head Valve (OHV) (ii) Over head Cam (OHC)

Outline of A Modern Engine Intake Port

Enhanced Flow Area due to Twin valves

Enhancement of Intake Flow Area using Twin Valves

Structure of Hardware for Air Intake Over head Valve (OHV) Over head Cam (OHC)

Poppet Valve & Air Passage

Geometrical Nomenclature for Valves The instantaneous valve flow area depends on valve lift and the geometrical details of the valve head, seat and stem. There are three separate stages to the flow area development as valve lift increases.

Geometrical Shape of Intake Flow Area For lower valve lift the minimum area is the valve curtain area. For larger lifts the minimum area is the valve seat area.

Shape of A Stream Tube Passing thru Valve Gap

Creative Valve Geometries