Determining characteristic curve of a four-stroke Diesel engine. - Calculating thermal efficiency of the engine. Apparatus. The experimental setup, shown in Fig . PDF | The simulation and computational development of modelling for the research is use the commercial Computational Fluid Dynamics (CFD) of GT- SUITE Explain simple engine operation. • Explain why gasoline is atomized in the small engine. • Describe four-stroke engine operation and explain the purpose of.
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3. 48/60 – Four-stroke diesel engine. MAN Diesel & Turbo is the world's leading designer and manufacturer of low and medium speed engines. Our involvement . 2. Figure 2 Cutaway of a Four-Stroke Supercharged Diesel Engine 4. Figure 3 Cross Section of a V-type Four Stroke Diesel Engine. Nov 20, The four stroke cycle. ➊➋➌➍. Learning objective. ▫ To understand the mechanical working processes in a four stroke diesel engine.
In IC engine, stroke is referred to the maximum distance travel by the piston in a single direction. The piston is free to move only in upward and downward direction.
In four stroke engine the piston move two time up and down and the crankshaft move two complete revolution to complete four piston cycle. These are suction stroke, compression stroke, expansion stroke and exhaust stroke. Suction stroke: In the suction stroke or intake stroke of diesel engine the piston start moves from top end of the cylinder to bottom end of the cylinder and simultaneously inlet valve opens.
At this time air at atmospheric pressure drawn inside the cylinder through the inlet valve by a pump. The inlet valve remains open until the piston reaches the lower end of cylinder. After it inlet valve close and seal the upper end of the cylinder. Compression stroke: After the piston passes bottom end of the cylinder, it starts moving up. Both valves are closed and the cylinder is sealed at that time. Originally Answered: What is the difference between a 2 stroke and a 4 stroke engine?
As demonstrated below, the piston creates an area of low pressure when it is at the beginning of the intake stroke and sucks in air from both intake and exhaust shafts. Hence, exhaust gases are sucked back into the engine for combustion and the fuel-air mixture from the intake shaft are expelled.
This is the first half of the cycle, until the the piston reaches it's highest point in the cylinder. The next half of the cycle occurs when a spark plug ignites the fuel-air mixture when the piston is at it's peak, thereby causing the violent expansion of gases and pushing the piston back down to power the crankshaft and ultimately your vehicle.
This is sometimes also know as the "Power Stroke" The above two step repeat themselves again and again, and that's what makes a two stroke engined vehicle move. Advantages of two strokes - Due to the existence of only two strokes, the "Power Stroke" occurs every half cycle. The work done on the piston is then used to turn the shaft, and the propellers, and to compress the gases in the neighboring cylinder's compression stroke.
As the volume is increased because of the piston's motion, the pressure and temperature of the gas are decreased. Exhaust stroke: At the end of the power stroke, the piston is located at bottom dead center.
Heat that is left over from the power stroke is now transferred to the water in the water jacket until the pressure approaches atmospheric pressure. The exhaust valve is then opened by the cam pushing on the rocker arm to begin the exhaust stroke.
The purpose of the exhaust stroke is to clear the cylinder of the spent exhaust in preparation for another ignition cycle. As the exhaust stroke begins, the cylinder and combustion chamber are full of exhaust products at low pressure. Because the exhaust valve is open, the exhaust gas is pushed past the valve and exits the engine.
The intake valve is closed and the electrical contact is open during this movement of the piston. At the end of the exhaust stroke, the exhaust valve is closed and the engine begins another intake stroke Stage 1 is the beginning of the intake stroke of the engine.
The pressure is near atmospheric pressure and the gas volume is at a minimum.
Between Stage 1 and Stage 2 the piston is pulled out of the cylinder with the intake valve open. Stage 2 begins the compression stroke of the engine.
Between Stage 2 and Stage 3, the piston moves back into the cylinder, the gas volume decreases, and the pressure increases because work is done on the gas by the piston. The combustion occurs very quickly and the volume remains constant. Heat is released during combustion which increases both the temperature and the pressure. Stage 4 begins the power stroke of the engine.