1 / 16

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.

dixiem
Download Presentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related