Diesel Fuel

THE DIESEL FUEL
Specification and reasons for design are what separates the different cars that are being built. Every manufacturer would love to have his particular designed engine to perform and function according to his own specification, that is why the owner manual is always necessary to be read by the car owner. The diesel engine has been so keen on my mind since last month and I will still drop a few posts clarifying a few issue that is controversial on the readers mind. In manufacturing, I can say that the engine design is very important in the operation of a diesel engine than the diesel fuel properties. The fuel properties are very important to be observed and it is with this thought did I put down this script.
The fuel economy of every diesel engine in existence is always put to consideration because if you own a vehicle and you discover that you are always finding yourself at the gas station very frequent to refill your tank, it should be known that it is either a mechanical fault on either the fuel supply system or a bad fuel economy. Scientifically, the fuel economy is always related to the heating value of the fuel. The heating value per volume is directly proportional to density when other fuel properties are unchanged. The heating value of diesel fuel is the heat of combustion, which means the heat released when a known quality of fuel is burned under specific conditions. This is all due to the fact that engine exhaust water as a gas, the net heating value is the approximate value to use for comparing fuels. Let me also review a particular scope of this study which is the distillation process of diesel fuel. Distillation process is one of the most used and important separation process which is used in a petroleum refinery after the refining process. Why is the distillation process used? This is because the distillation process is the suitable process for separating crude oil or other wide boiling range mixtures into other petroleum products with narrower boiling ranges.
THE DIESEL CYCLE
Ignition occurs in the diesel engine by injecting the fuel into the air charge which has been heated by compression to a temperature greater than the ignition part of the fuel. The diesel engine also converts the energy stored in the fuel’s chemical bonds into mechanical energy by burning the fuel. Chemically, the chemical reaction which occurs when the burning of the fuel commences, it liberates heat, which causes the gases to expand, forcing the piston therefore to rotate the crankshaft. A four stroke cylinder requires two rotations of the crankshaft to complete one cycle. I would explain each stroke and the process taken individually. Starting from the first stroke which is the intake to the compression and then to the power and exhaust stroke…..
Intake :- the piston passes top dead center, the intake valves open and fresh air is admitted into the cylinder, the exhaust valve is still open for a few degrees to allow scavenging to occur.
Compression :- after the piston passes the bottom dead center, the intake valve closes and the piston travels up to the dead center which endorses the completion of the first crankshaft rotation.
In between this cycle and the next, the fuel injection process takes place, at this point, the piston nears the top dead center on the compression stroke, the fuel is injected by the injectors and the fuel starts to burn which further heats the gases in the cylinder.
Power :- the piston passes the top dead center and the expanding gasses force the piston down, rotating the crankshaft.
Exhaust:- as the piston passes bottom dead center, the exhaust valves open and the exhaust gases start to flow out of the cylinder. This whole process continues as the piston goes up to the top dead center pumping the spent gases out of the cylinder. At top dead center, the second crankshaft rotation is completed.