Diyvehiclerepair
- What is the working fluid in diesel engine?
- How does a diesel fuel engine work?
- What happens inside a diesel engine?
- What ignites the fuel inside the diesel engine?
- What is meant by Otto cycle?
- How does a diesel engine work vs gas?
- How did the first diesel engine work?
- What is scavenging air?
- How do glow plugs work in a diesel engine?
- Do diesel engines use sparkplugs?
- Why does diesel explode under pressure?
- Why does diesel ignite under pressure?
- What is cylinder in diesel engine?
- Why is Diesel cycle better than Otto cycle?
- On which thermodynamic cycle does the diesel engine work?
- Is a diesel engine a heat engine?
What is the working fluid in diesel engine?
Air, which is 79% nitrogen, is the working fluid in a conventional diesel engine. The nitrogen is discarded after use, along with combustion products. In closed-cycle diesel engines, exhaust gas is re-circulated after combustion-produced by-products are separated and removed from the inert working fluid.
How does a diesel fuel engine work?
Diesel vehicles are similar to gasoline vehicles because they both use internal combustion engines. ... In a compression-ignited system, the diesel fuel is injected into the combustion chamber of the engine and ignited by the high temperatures achieved when the gas is compressed by the engine piston.
What happens inside a diesel engine?
diesel engine, any internal-combustion engine in which air is compressed to a sufficiently high temperature to ignite diesel fuel injected into the cylinder, where combustion and expansion actuate a piston.
What ignites the fuel inside the diesel engine?
A diesel engine takes air, compresses it, and then injects fuel into the compressed air. The heat of the compressed air ignites the fuel spontaneously. ... A diesel engine compresses only air, so the compression ratio can be much higher.
What is meant by Otto cycle?
An Otto cycle is an idealized thermodynamic cycle that describes the functioning of a typical spark ignition piston engine. ... The Otto cycle is a description of what happens to a mass of gas as it is subjected to changes of pressure, temperature, volume, addition of heat, and removal of heat.
How does a diesel engine work vs gas?
Both diesel engines and gasoline engines convert fuel into energy through a series of small explosions — or combustions. ... In a gasoline engine, fuel is mixed with air, compressed by pistons and ignited by sparks from spark plugs. In a diesel engine, however, the air is compressed first, and then the fuel is injected.
How did the first diesel engine work?
Successful early versions of the engine used low pressure fuel injection aided by a blast of compressed air to atomize the fuel. Since the air had to be pressured above the cylinder pressure at the time of injection, several stages of compression to reach pressures as high as 6900 kPa (1000 psi) were required.
What is scavenging air?
Scavenging air in a diesel engine means air used for forcing burnt gases out of the engine's cylinder during the exhaust period.
How do glow plugs work in a diesel engine?
Glow plugs are like mini heaters in your car's bonnet. As heating elements, they warm the air and diesel in your engine for effective combustion. Glow plugs share the same functionality as spark plugs. But rather than sparking the ignition in petrol engines, they heat air and fuel to start diesel engines.
Do diesel engines use sparkplugs?
All combustion engines need three things: fuel, air and heat or an ignition source. Both spark plugs and glow plugs are the ignition source in a combustion engine. ... Spark plugs are only found in gasoline engines and glow plugs are in diesel ones.
Why does diesel explode under pressure?
Under that pressure, the temperature is raised considerably. Diesel engines have no spark plugs to ignite the fuel. In the cylinder, the pressure is so great the temperature is very high. The pressure is so great (16:1 or 234 psi) that the temperature becomes high enough to ignite the fuel without a spark plug.
Why does diesel ignite under pressure?
There is no specific pressure that ignites diesel fuel. It is the heat of compression that ignites the fuel. If the air temperature is very cold, not enough heat is generated even though full compression is achieved.
What is cylinder in diesel engine?
The cylinder is the space through which the piston travels, propelled to the energy generated from the combustion of the air/fuel mixture in the combustion chamber.
Why is Diesel cycle better than Otto cycle?
Although for a given compression ratio the Otto cycle has higher efficiency, because the Diesel engine can be operated to higher compression ratio, the engine can actually have higher efficiency than an Otto cycle when both are operated at compression ratios that might be achieved in practice.
On which thermodynamic cycle does the diesel engine work?
Otto cycle The Otto Cycle is named after Nikolaus Otto (1832–1891, German) who is credited as the first creator of a petroleum fuel based internal combustion engine operating under a four stroke cycle.
Is a diesel engine a heat engine?
A diesel engine is a type of internal combustion heat engine, powered by diesel. These engines run small electric generators called diesel generators, often in remote areas as well as the engines of cars and trucks (both large and small).
