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MEL713 – DESIGN OF I.C. ENGINES: COMPONENTS & SUB-SYSTEMS

MEL713 – DESIGN OF I.C. ENGINES: COMPONENTS & SUB-SYSTEMS. P M V Subbarao Professor Mechanical Engineering Department. Laboratory & Design Practicals …. Engine Design and Operating Parameters. Thermodynamic Parameters Define indicated, brake, and friction quantities.

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MEL713 – DESIGN OF I.C. ENGINES: COMPONENTS & SUB-SYSTEMS

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  1. MEL713 – DESIGN OF I.C. ENGINES: COMPONENTS & SUB-SYSTEMS P M V Subbarao Professor Mechanical Engineering Department Laboratory & Design Practicals …..

  2. Engine Design and Operating Parameters • Thermodynamic Parameters • Define indicated, brake, and friction quantities. • Define net and gross quantities • Calculate sfc, AF, vol. eff. and engine efficiency • Correct performance data for atmospheric conditions. • Geometric & Kinematic Parameters. • Define and use the different rated conditions • Calculate engine volume, piston speed, and cylinder surface area as a function of crank angle • Draw a cylinder schematic and identify the bore, stroke, crank radius, TDC, BDC, and crank angle

  3. List of Laboratory Experiments • Study of Anatomy of A Single Cylinder Diesel Engine. • Study of Anatomy of A Multi-cylinder Diesel Engine. • Disassembly and assembly of A single cylinder Diesel Engine. • Measurement of Valve Timing of A Single Cylinder Diesel Engine. • Performance study of Single cylinder Diesel Engine. • Performance study of Multi cylinder Diesel Engine. • Performance study & Morse Testing of Multi cylinder (MPFI) Gasoline Engine. • Performance study of Dual Fuel Engine. • Measurement of p-q diagram on a diesel engine. • Measurement of coefficient of discharge of Valve as function of valve lift.

  4. Division of Sub Groups : Allocation of Experiments

  5. Simplified View of An Engine

  6. Anatomy of A Multi-cylinder Diesel Engine

  7. LUBRICATION SYSTEM

  8. Lubrication Networking

  9. Exhaust Valve : Operation Schedule Pcyl Patm

  10. Inlet Valve : Operation Schedule Pcyl Patm

  11. Valve Actuation Diagram

  12. Cold Period of Operation Hot Period of Operation

  13. Geometry of Flow Passage through Valves

  14. Geometry of Valve

  15. Stages of Valve Lifting

  16. Instantaneous Valve Events • For low lift valves, the minimum flow area corresponds to a frustum of right circular cone. • The conical face between valve and seat is, perpendicular to the seat, defines the flow area. The minimum area is:

  17. For the second stage, the minimum area is still the slant surface of a frustum of a right circular cone. • However, this surface is not perpendicular to the valve seat. • The base angle of the cone increases from (900-b) toward that of a cylinder. • For this stage: Dm is mean diameter of seat :

  18. When the valve lift is sufficiently large, the minimum flow area is no longer between the valve head and seat. • It is the port area minus the sectional area of the valve stem. Then,

  19. Valve Lift Curves

  20. Frictional Compressible Flow Through Inlet Valve • The real gas flow effects are included by means of an experimentally determined discharge coefficient CD. • The air flow rate is related to the upstream stagnation pressure p0 and stagnation temperature T0, Static pressure just down stream of the valve and a reference area AR. • AR is a characteristic of the valve design. When the flow is chocked:

  21. Discharge Coefficient: The value of CD and the choice of reference area AR are linked together. The product CD . AR is the effective flow area of the valve assembly, AE. In general valve head area or port area or curtain area are used as reference areas.

  22. INLET VALVES 1 2 3

  23. EXHAUST VALVES

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