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Why during the ignition pressure remain constant in diesel engine?
Wiki User
∙ 9y ago
The ignition temperature, (temperature at which diesel fuel ignites) is 490*F. This temperature corresponds to a set compression of the gasses in the cylinder of the engine. Some, but not all, diesel engines have glow plugs to initially warm the air when you first start the engine because the temperature of the air in the diesel engine is too cold to get the ignition temperature simply from compression. while the engine is running the compression heats the air to the ignition temperature. This compression (or pressure) is the same each time the cylinder fires. Using the universal gas law you can find that corresponding compression versus the ambient temperature and pressure. Typically this will occur at approximately 16 bars. Almost all diesel engines are designed to operate at a compression ratio of 15:1 - 20:1, less if supercharged or turbocharged.
Wiki User
∙ 9y ago
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What is mean effective pressure of diesel engine?
It is the theoretical constant pressure acting on the piston during one power stroke.
Why diesel engines called constant volume engines?
They aren't.Gasoline engines are (sort-of) constant volume engines while Diesel engines are (sort of) constant pressure engines.In a gas engine, the combustion process is so fast compared to the travel rate of the piston that it all happens in the same volume, before the piston has had much time to move away.In a Diesel engine combustion is so much slower that the piston will actually have time to move away while fuel is still being burnt.As the volume of the combustion chamber increases during burn as the piston moves away, the pressure will remain pretty much the same throughout the burn.
What is intake stroke in a diesel engine?
In a gasoline engine, it is a fuel-air mixture that is drawn in during the intake stroke, unless the engine is fuel injected. In a fuel injected or a diesel engine, it is air, because the fuel (gasoline or diesel) is injected at the "last moment" before ignition.
What engine is the air and fuel mixture ignited by the heat created during the compression stage rather than a spark plug?
That's your average Diesel, or compression ignition engine.
What is constant volume?
The constant Volume process, also known as Isovolumetric, is where the volume is constant and does not change. In a P, V, Diagram this should be where volume is constant where Pressure is increased. The work done (area under the curve) would be = to 0 in this case.
Why does the pressure in the lungs become lower than the atmospheric pressure during inhalation afte the contract of the diaphragm?
The contraction of the diaphragm enlarges the volume of the chest cavity. This causes the air pressure in the chest cavity to decrease. This is because of the physics principle that states that, if the amount of gas in a particular container is constant, the product of pressure and volume is constant. Since you're increasing volume, the pressure must decrease.
What is heat of enthalphy?
Enthalpy H is a thermodynamic state function, that is defined for homogeneous systems as H = U + P V where U is the internal energy of the system, P the pressure and V the volume. If we perform a transformation of the system between the states 0 and 1 maintaining the pressure constant, for the first thermodynamic principle, we have U1 - U0 = Q - P (V1 - V0) where Q is the heat the system absorbs during the transformation. From the definition of enthalpy we also have H1 - H0 = U1 - U0 + P (V1 - V0) Putting together the last two equations we get that, if pressure is maintained constant, H1 - H0 = Q that is the variation of enthalpy is equal too the heat absorbed during the transformation. Naturally this is not true if the pressure is not constant, but the case of constant pressure is particularly important since almost all chemical equations happen at constant pressure.
What constant is in c?
constant is a fixed value that do not changed during execution constant is a fixed value that do not changed during execution
How automobile engine applied to Boyle's law?
As volume changes so does pressure. During the compression cycle of an engine, the volume is decreasing causing the pressure to increase. This happens so rapidly that I do not believe that temperature stays constant. For this to actually be following Boyle's law the temp is supposed to remain constant.
Latent heat energy levels?
The latent heat energy levels refers to the heat absorbed during a change phase at a constant pressure and temperature.
How do isobars measure air pressure?
Isobars are not measured. An isobar describes a part of a thermodynamic process during which the pressure doesn't change. It is also used as a term in graph tables where it describes the behavior of a material at a constant pressure.
Why doesn't a star expand or collapse during the main sequence?
A star remains relatively constant in size because the force of gravity is in equilibrium with the pressure caused by the fusion at the core.
