For the better knowledge of internal combustion engine every one must know about the following terms,
01) Carburetion: -
The process of breaking up the fuel into minute particles and mixing it with air is called "Carburetion". This process is mostly used in the internal combustion engine, which have low compression ratio and which use highly volatile liquid fuels such as petrol. The process of breaking up fuel in minute particles is known as "Atomization". Carburettor is the device where all the carburetion takes place.
02) Scavenging: -
The process of removing burnt exhaust gases from the combustion chamber of the engine cylinder is known as "Scavenging". In four-stroke cycle engine, the piston pushes the burnt gases to exhaust manifold during its exhaust stroke. In the two-stroke cycle engine a blast of fresh charge is made to enter at higher Velocity into a combustion chamber at the end of working stroke and thus drives out burnt exhaust gases.
03) Compensation: -
The process of providing additional fuel or reducing the fuel by certain means to correct the mixture strength to meet the varying nature of speeds and load on the engines is known as "Compensation". This process is mostly used in simple carburettor specially used for automotive purposes.
04) Firing Order: -
The sequences in which firing or power impulses occur in an internal combustion engine are called "Firing Order". The firing order should be such that there is always a proper balance and it does not cause vibrations.
05) Detonation: -
Some sudden and violent knocks are experienced in internal combustion engine at sometimes. This knocks are known by "Detonation". This knock is set up by a high-pressure wave giving a loud pulsating noise as it strikes against the cylinder walls, cylinder head and piston. It should be noted that detonation is not pre-ignition but something, which occur after the spark, has started the ignition.
06) Doping: -
The process of adding small quantity of Tetraethyl lead to suppress the detonation in petrol engine is called "Doping". If the tetraethyl lead used in large proportion, there are chances of engine damage due to deposition of lead oxide in the combustion chamber.
07) Diesel Knock: -
A high-pressure wave set up in compression ignition engine (Diesel Engine), which causes knocks. This knock is called as "Diesel knock". It badly affects the engine efficiency and power drop; also engine runs very rough due to diesel knock.
08) Dissociation: -
If a gas or mixture of gases is heated to very high temperature, the vibrating molecules of different gases make violent encounters resulting in splitting up of the compound molecules into smaller molecules which recombine to form their compound molecules as the temperature lowered. The phenomenon is called "Dissociation". The dissociation is mainly due to breaking up of carbon dioxide into carbon monoxide and oxygen.
09) Supercharging: -
The process of increasing the weight or density of air-fuel mixture or compressed air, induced into the cylinder during the induction stroke is known as "Supercharging". This is achieved by a separate compressor and known as supercharger or blower.
10) Turbulence: -
When the atomised fuel injected into the combustion chamber of compression ignition engine may be burnt efficiently there should be a high relative velocity between the air and fuel so that a thorough mixing takes place. This is achieved by "Turbulence".
I hope this will help you to get better knowledge about your engine and can increase the performance of engine.
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