Table of Contents
- 1 What mechanism does a diesel engine use to achieve combustion in the combustion chamber?
- 2 What does a diesel compress and heat up enough to ignite fuel?
- 3 How does diesel ignite in the engine?
- 4 What can diesel engines run on?
- 5 At what pressure does diesel ignite?
- 6 What temp does diesel ignite?
- 7 What is the thermal efficiency of a caterpillar non confidential diesel engine?
- 8 What is an example of an internal combustion engine?
What mechanism does a diesel engine use to achieve combustion in the combustion chamber?
Diesel engines work by compressing only air, or air plus residual combustion gases from the exhaust known as exhaust gas recirculation (EGR) is inducted into the chamber during the intake stroke, and compressed during the compression stroke.
What is the source of heat that ignites the fuel in diesel engine?
air
Fuel ignition Diesel engines rely on this. A piston compresses the air in the cylinder (see figure 1), making it extremely hot. The diesel is then atomized in the injectors, and a mist is sprayed into the hot air. The hot air immediately ignites the fuel, providing ignition.
What does a diesel compress and heat up enough to ignite fuel?
Diesel engines compress the air within the combustion chamber by many times the compression rate used within a gasoline engine. As the air compresses, it begins to heat up and reaches a temperature that ignites the fuel.
What temperature does compression ignition occur?
It happens when intake air—which often is combined with recirculating exhaust gas—is compressed at extremely high pressure, creating the extreme heat that’s necessary for igniting diesel fuel (approximately 1,400 degrees Fahrenheit), which has a higher density than gasoline.
How does diesel ignite in the 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. The higher the compression ratio, the more power generated.
What can a diesel engine use for fuel?
Vegetable oils, such as palm, soybean, sunflower, peanut, and olive, as alternative fuels can be used for diesel engines. As an alternative fuel, vegetable oil is one of the renewable fuels.
What can diesel engines run on?
What can a diesel engine run on? (Kerosene, Used Oil, Vegetable Oil, Gasoline)
- A diesel engine cannot run on clean gasoline, but it can run on diesel mixed with gasoline.
- Yes, but continue reading.
Can diesel vapors ignite?
Diesel vapors can ignite and explode when mixed with air. The lower explosive limit is less than 1\%, and the upper explosive limit is about 10\%. That means that diesel fuel vapors from a storage tank can explode with as little as 1\% of the air being diesel fuel vapors.
At what pressure does diesel ignite?
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.
What is the temperature of compressed air in diesel engine?
Just before the piston reaches the top of the compression stroke, fuel is injected directly into the compressed air. The compressed air temperature is hot enough (typically above 1000ºF [538ºC]) to spontaneously ignite the fuel (which is sometimes called compression-ignition or self-ignition).
What temp does diesel ignite?
Diesel fuel flash points vary between 52 and 96 °C (126 and 205 °F). Diesel is suitable for use in a compression-ignition engine. Air is compressed until it heats above the autoignition temperature of the fuel, which is then injected as a high-pressure spray, keeping the fuel-air mix within flammable limits.
What happens if the exhaust temperature is too high in diesel?
Consequence Of Diesel Engines High exhaust temperature There are lots of consequences which high exhaust gas temperature can cause to the engine parts, these are: – exhaust valve life time reduces up to 50\% if continue with same high temperature. – Cylinder liners wear more faster as required.
What is the thermal efficiency of a caterpillar non confidential diesel engine?
Engine Technologies Caterpillar Non-Confidential Diesel Engine Thermal Efficiency & Exhaust Waste Heat LPL Engine 0 20 40 60 80 100 Fuel Energy (kW) Fuel Energy, \% ~ 8\% ~ 22\% Brake Power Coolant Heat Rej
What are the exhaust gas properties of diesel exhaust system?
The designer of the exhaust system and/or exhaust system components must know a number of exhaust gas properties. Compared to the composition of air, the diesel exhaust gas contains increased concentrations of water vapor (H2O) and carbon dioxide (CO2)—the main combustion products.
What is an example of an internal combustion engine?
Examples for internal combustion engines include the use of engine coolant for cabin heat, turbocharging to increase power density, bottoming cycles to produce additional work from exhaust gas, or integrated exhaust manifold to facilitate engine warm-up.