compression stroke वाक्य
उदाहरण वाक्य
मोबाइल
- Diesel engines do not have preignition problems because fuel is injected at the end of the compression stroke, therefore higher compression is used.
- Furthermore, fuel is injected during the intake stroke and not at the end of the compression stroke as in a Diesel's compression ignition engine.
- Knocking is more or less unavoidable in diesel engines, where fuel is injected into highly compressed air towards the end of the compression stroke.
- If during the compression stroke the air-fuel mix reaches a temperature greater than the auto-ignition temperature of the fuel, the fuel self or auto-ignites.
- When starting from cold, the engine's combustion efficiency is reduced because the cold engine block draws heat out of the cylinder in the compression stroke.
- As the piston initially moves upwards in what is traditionally the compression stroke, the charge is partially expelled back out through the still-open intake valve.
- So in the Miller cycle engine, the piston actually compresses the fuel-air mixture only during the latter 70 % to 80 % of the compression stroke.
- During the initial part of the compression stroke, the piston pushes part of the fuel-air mixture through the still-open intake valve, and back into the intake manifold.
- Thus, in each revolution, one piston provided a compression stroke and a power stroke, and then the other piston provided an exhaust stroke and a charging stroke.
- The temperature at the top of the compression stroke depends on many factors, particularly the compression ratio of the cylinder and the starting temperature of the inducted air.
- In effect, the compression stroke is two discrete cycles : the initial portion when the intake valve is open and final portion when the intake valve is closed.
- Starting at 1, the piston is at bottom dead centre and both valves are closed at the start of the compression stroke; the cylinder contains air at atmospheric pressure.
- This finds practical application in diesel engines which rely on the lack of quick heat dissipation during their compression stroke to elevate the fuel vapor temperature sufficiently to ignite it.
- Ignition occurs as the temperature of the fuel / air mixture is taken over its autoignition temperature, due to heat generated by the compression of the air during the compression stroke.
- This produces a "'homogeneous charge : "'a homogeneous mixture of air and fuel, which is ignited by a spark plug at a predetermined moment near the top of the compression stroke.
- In the case of the normally aspirated engine, at the start of the compression stroke the cylinder air / fuel volume is very high, this translates into a low starting pressure.
- The piston reaches bottom center and begins its climb up the cylinder on the compression stroke _ when the fuel / air is compressed just prior to ignition and the power stroke.
- With this design, Atkinson was able to make a more conventional engine yet preserve the efficiency of having a short compression stroke and a long expansion stroke in a rather ingenious way.
- Normally during the compression stroke, energy is used as the upward-traveling piston compresses air in the cylinder; the compressed air then acts as a compressed spring and pushes the piston back down.
- In addition, as the air is compressed and becomes heated, some of this heat is lost to the cold cylinder walls, further reducing the temperature at the top of the compression stroke.
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