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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 phases of ignition in diesel engine?
The phases of ignition in a diesel engine include the following stages: first, air is compressed to a high temperature and pressure during the compression stroke. Next, diesel fuel is injected into the hot compressed air, leading to a rapid increase in temperature due to the fuel's auto-ignition properties. This results in combustion, which pushes the piston down during the power stroke. The entire process is characterized by a delay period known as ignition delay, which is the time between fuel injection and the start of combustion.
What ignites the fuel in the engine cylinder of a diesel engine?
In a diesel engine, fuel is ignited by the heat generated from the high pressure created during the compression stroke. Air is compressed to a very high pressure, raising its temperature significantly, often above the fuel's ignition point. When diesel fuel is injected into the hot, compressed air, it ignites spontaneously without the need for a spark plug. This process is known as compression ignition.
How much air pressure in comparison stroke in diesel engine?
In a diesel engine, the air pressure during the compression stroke can reach around 30 to 50 psi (pounds per square inch), but it can be significantly higher in some high-performance engines, sometimes exceeding 100 psi. This high pressure is crucial for achieving the necessary temperature to ignite the diesel fuel, as diesel engines rely on compression ignition rather than spark plugs. The compression ratio in diesel engines typically ranges from 14:1 to 25:1, contributing to the high pressures observed.
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 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.
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.
What is constant energy in relation to an ignition system?
Constant energy in relation to an ignition system refers to a design that delivers a consistent amount of energy to the spark plug during each ignition event. This ensures that the spark is strong enough to ignite the air-fuel mixture effectively, regardless of engine speed or load conditions. By maintaining a constant energy output, the ignition system can improve combustion efficiency, enhance engine performance, and reduce emissions. Such systems are often found in high-performance applications where optimal ignition is critical.
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.
