Table of Contents
Why air fuel mixture is not used in diesel engine?
air fuel ratios are higher which makes the mixture lean. Diesel engines run on Lean mixture, it is because to self ignite atomized diesel when injected. Now, the temperature inside the combustion chamber has to be above the self ignition temperature of diesel (above 210 C) when the piston is about to reach TDC.
How is air and fuel mixed in a diesel engine?
Fuel Injection The port injection system injects air into the fuel right before the intake stroke. In contrast, a carburetor mixes the fuel and air together before sending it into the cylinder to compress. In a diesel engine, the fuel is injected directly into the cylinder.
Why diesel is a mixture?
Diesel fuel is a mixture of hydrocarbons—with boiling points in the range of 150 to 380°C—which are obtained from petroleum. Petroleum crude oils are composed of hydrocarbons of three major classes: (1) paraffinic, (2) naphthenic (or cycloparaffinic), and (3) aromatic hydrocarbons.
How is fuel and air mixed in an engine?
The carburetor. It contains fuel and the inlet air passing thru draws the fuel. The fuel is sprayed or the internal valve increases available fuel to the airstream. The atomized fuel mixes somewhat with the air as it is let into the cylinders where the mixture turns to vapor.
Where is the fuel and air mixed in an engine?
In a spark ignition engine, the fuel is mixed with air and then inducted into the cylinder during the intake process. After the piston compresses the fuel-air mixture, the spark ignites it, causing combustion. The expansion of the combustion gases pushes the piston during the power stroke.
In which stroke of diesel engine ignition mixture of air and fuel expands?
Typically the value is approximately 9:1 in spark ignition engines and 15:1 in diesel engines. 3. Power stroke: when the piston ascends and reaches top dead center, an electric current ignites the spark plug and as the mixed gas burns, it expands and builds pressure in the combustion chamber.
Which part is responsible for igniting the air fuel mixture in gasoline engines?
piston
In a spark ignition engine, the fuel is mixed with air and then inducted into the cylinder during the intake process. After the piston compresses the fuel-air mixture, the spark ignites it, causing combustion.
Which part is not common between petrol and diesel engine?
Detailed Solution
| Petrol engine | Diesel engine |
|---|---|
| Less vibration, and hence, smooth running. | More vibration, and hence, rough running and noisier. |
| Engine weight is less. | Engine weight is more. |
| It emits carbon monoxide. (CO) | It emits carbon dioxide. (CO2) |