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Thermal Engineering 1

by Anna Superkings
Type: PracticalInstitute: ANNA UNIVERISTY Specialization: Mechanical EngineeringOffline Downloads: 2Views: 37Uploaded: 2 months agoAdd to Favourite

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Anna Superkings
Anna Superkings
ME6412 ‐ THERMAL ENGINEERING LAB ‐ I Name : ……………………………………… Reg. No. : ……………………………………… Branch : ……………………………………… Year & Sem. : ……………………………………....  1 
ME6412 ‐ THERMAL ENGINEERING LAB ‐ I SAFETY REGULATIONS Users of Thermal Engineering Lab must comply with the following safety instructions. 1. Wear always pants and safety shoes when you operate any engine. Sandals are not allowed at all. 2. There should be no over-crowding. 3. Make sure that you stay away from hot exhaust lines and moving parts of engines 4. Before operating any machine, you must be aware of the following a. Location of fire extinguishers and the outside exits. b. How the engine operates. Read instruction or manual before operating it. c. How to turn off the engine in case of damages. 5. When you hear or see a danger alarm from the engine that you using, stop the engine immediately. 6. Make sure that there is no fuel or oil spill on the floor. 7. Consult the instructor for safety precautions to be followed. 8. Do not run inside the lab and concentrate on the present task. 9. When moving heavy equipments or gas cylinders, use carts 10 Always use the right tools for the given task. 11. Handle the tools and equipments with extreme care and return the tools to their proper places (Tool Cabinets). 12 For cleaning tools or equipments, use only the proper cleaner. Never use fuels such as gasoline or diesel for cleaning. 13. Handle fuels with extreme caution. a. Use the designated area for this purpose. b. Use the proper containers (safety cans) to carry fuels. c. Make sure there is no electric spark present. d. Do not leave fuels in open containers. 14. Make sure that all gas cylinders are chained and well supported. 15. Before operating engine, make sure that there is no fuel or gas leakage  2 
ME6412 ‐ THERMAL ENGINEERING LAB ‐ I ME6412 THERMAL ENGINEERING LAB- I LTPC 0032 LIST OF EXPERIMENTS I.C ENGINE LAB AND FUELS LAB (30) 1. Valve Timing and Port Timing Diagrams. 2. Actual p-v diagrams of IC engines 3. Performance Test on 4-stroke Diesel Engine. 4. Heat Balance Test on 4-stroke Diesel Engine. 5. Morse Test on Multicylinder Petrol Engine. 6. Retardation Test to find Frictional Power of a Diesel Engine. 7. Determination of Viscosity – Red Wood Viscometer. 8. Determination of Flash Point and Fire Point of various fuels / lubricants. STEAM LAB (15) 9. Study of Steam Generators and Turbines. 10. Performance and Energy Balance Test on a Steam Generator 11. Performance and Energy Balance Test on Steam Turbine.. TOTAL: 45 PERIODS  3 
ME6412 ‐ THERMAL ENGINEERING LAB ‐ I EXP. NO.: DATE: VALVE TIMING DIAGRAM FOR A FOUR STROKE DIESEL ENGINE AIM: To study the cut section of a given four stroke single cylinder, high speed diesel engine mechanism and to draw the valve timing diagram. APPARATUS REQUIRED: 1. Four stroke diesel engine test rig, 2. Measuring tape and 3. Chalk. DESCRIPTION: The four stroke engine has two valves namely Inlet valve and Exhaust valve. The cycle of operation is completed in two revolutions of the crank shaft. During suction stroke, only air is charged into the cylinder. Theoretically this stroke is executed for 180° of crank shaft rotation. In actual practice the suction stroke starts before TDC and continues few degrees of crank rotation after BDC. It inter connects the piston and crank shaft & transmit the gas forces from the piston to the crank shaft. Crank Shaft: It converts the reciprocating motion of the piston into useful rotary motion. The balancing mass are provided on the crank shaft for static, dynamic balancing of the rotating system. Piston Rings: Fitted into the slots rounded the piston to provided a tight seal between the piston and cylinder walls, thus preventing leakages of combustion gases. Cam Shaft: The cam shaft and its associated parts control the opening & closing of the 2 valves . The associated parts are push rods, rocker arms, valve springs and tappets. The cam shaft is driven by crank shaft then timing gear. Fly Wheel: In order to achieve a uniform torque and inertia in the form of a wheel is attached to the o/p shaft and this wheel is called fly wheel.  4 

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