P M V Subbarao Professor Mechanical Engineering Department

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Presentation transcript:

P M V Subbarao Professor Mechanical Engineering Department Influence of (Valve) Design & Operational Parameters on Volumetric Efficiency of Engine P M V Subbarao Professor Mechanical Engineering Department Clues to Improve Filling & Emptying Effectiveness….

Frictional Compressible Flow Through Inlet Valve The real gas flow effects are included by means of an experimentally determined discharge coefficient CD. When the flow is chocked:

Discharge Coefficient: The value of CD and the available minimum flow area Amin are linked together. The product CD . Amin is the effective flow area of the valve assembly, AE.

Non-dimensional available flow area for real Flow through INLET VALVES c

EXHAUST VALVES

Selection of Valve Timing for Better Flow

Selection of Maximum Valve Lift

Selection of Maximum Lift & Valve timings

Thermodynamic Parameters Vs Volumetric Efficiency The volumetric efficiency is a function of Intake mixture pressure pi. Intake mixture Temperature Ti. Fuel/ air ratio (F/A). Compression ratio r. Exhaust pressure, pe. Where m is the mass of mixture in the cylinder at the end of intake stroke.

Effect of Fuel composition, Phase & Fuel/air Ratio In a SI engine, the presence of gaseous fuel and moisture in the intake system reduces the air partial pressure below the mixture pressure. For a mixture:

Fuel Chemistry Vs Volumetric Efficiency 1.0 C8H18 Pa,I/pi CH4 H2 0.6 1.5 Equivalence Ratio

Compression Ratio Vs Volumetric Efficiency

Manifold Pressures @1400 rpm : Wide Open Throttle

Manifold Pressures @2400 rpm : Wide Open Throttle

Manifold Pressures @2000 rpm : 15% Open Throttle

Integrated Description of Wave Action