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Influence of (Valve) Design & Operational Parameters on Volumetric Efficiency of Engine

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.

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Influence of (Valve) Design & Operational Parameters on Volumetric Efficiency of Engine

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  1. 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….

  2. 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:

  3. 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.

  4. Non-dimensional available flow area for real Flow through INLET VALVES a b c

  5. EXHAUST VALVES

  6. Selection of Valve Timing for Better Flow

  7. Selection of Maximum Valve Lift

  8. Selection of Maximum Lift & Valve timings

  9. 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.

  10. 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:

  11. Fuel Chemistry Vs Volumetric Efficiency 1.0 C8H18 Pa,I/pi CH4 H2 0.6 1.5 Equivalence Ratio 0

  12. Compression Ratio Vs Volumetric Efficiency

  13. Manifold Pressures @1400 rpm : Wide Open Throttle

  14. Manifold Pressures @2400 rpm : Wide Open Throttle

  15. Manifold Pressures @2000 rpm : 15% Open Throttle

  16. Integrated Description of Wave Action

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