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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.
What else can I help you with?
Which is constant pressure cycle?
diesel cycle is not called constant pressure cycle constant pressure cycle is Brayton cycle and there is hell of a difference with diesel cycle. you surely misunderstood the question man
What is mean effective pressure of diesel engine?
It is the theoretical constant pressure acting on the piston during one power stroke.
What is the relationship between constant pressure enthalpy and the changes in a system's energy content during a process?
Constant pressure enthalpy is a measure of the energy content of a system at a constant pressure. During a process, changes in the system's energy content are reflected in the enthalpy changes. The relationship between constant pressure enthalpy and changes in energy content is that they are directly related - as the enthalpy changes, so does the energy content of the system.
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 special name is given to a heat change at constant pressure?
A heat change at constant pressure is called enthalpy change, often denoted as ΔH. It represents the change in total heat content of a system during a process occurring at constant pressure.
In what type of engine is the air and fuel mixture ignited by the heat created during the compression stage?
The air and fuel mixture is ignited by the heat created during the compression stage in a compression ignition engine, also known as a diesel engine.
Which stage occurs just before ignition in interal combustion engine?
The stage that occurs just before ignition in an internal combustion engine is the compression stroke. During this phase, the piston moves upward in the cylinder, compressing the air-fuel mixture to a high pressure and temperature. This compression prepares the mixture for ignition, which is typically initiated by a spark from the spark plug in gasoline engines or by the heat of compression in diesel engines.
When atmospheric pressure on a pond remains constant during hot weather what happens to the force of air on the surface of the pond?
When atmospheric pressure on a pond remains constant during hot weather, the force of air on the surface of the pond also remains constant. Atmospheric pressure is not affected by temperature changes alone, so the force exerted by the air on the pond's surface stays the same.
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.
Which of the following is true of an isothermal process Temperature is constant W equals Q ΔU equals 0 Pressure is constant?
Temperature is constant during an isothermal process. The work done (W) is equal to the heat added (Q). The change in internal energy (ΔU) is zero for an isothermal process. The pressure can vary during an isothermal process, depending on the specific conditions.
How does the pressure of an ideal gas change during an isobaric compression process?
During an isobaric compression process, the pressure of an ideal gas increases as the volume decreases while the temperature remains constant.
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.
