What is the difference between Otto and Diesel cycle?
Otto cycle is used by petrol ignition whereas diesel engine uses the diesel cycle. Another noteworthy difference is that the Otto cycle heat occurs at constant volume, whereas the diesel cycle works on constant pressure….
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.
What is Gamma in Otto cycle?
T3 / T2 = r ^ (gamma – 1) where p is the pressure, T is the temperature, and gamma is the ratio of specific heats. During the combustion process (3-4), the volume is held constant and heat is released. The change in temperature is given by. T4 = T3 + f * Q /cv.
Which cycle is mostly used in high compression engine?
It operates on either a two-stroke or four-stroke cycle (see figure); however, unlike the spark-ignition gasoline engine, the diesel engine induces only air into the combustion chamber on its intake stroke. Diesel engines are typically constructed with compression ratios in the range 14:1 to 22:1.
Which governing method is used in petrol engine?
Quantitative Governing Secondly, by throttling the mixture before it is made to enter the engine cylinder. This method is largely used for governing petrol and big gas engines….
What are the effects of knocking?
Knocking combustion causes major engine damage, and also reduces the efficiency. The method uses the measurement and analysis of cylinder pressure signal for various loads. The pressure signal is to be converted into frequency domain that shows the accurate knocking combustion of fuel mixtures.
How knocking can be reduced?
Because pressure and temperature are strongly linked, knock can also be attenuated by controlling peak combustion chamber temperatures by compression ratio reduction, exhaust gas recirculation, appropriate calibration of the engine’s ignition timing schedule, and careful design of the engine’s combustion chambers and …
How does engine knock sound?
The knocking sound often occurs when the air-fuel mixture is incorrect, which causes the fuel to burn in uneven pockets rather than uniform bursts. Left untreated, it can cause damage to the piston and cylinder wall. A knocking sound can also be caused by a lack of lubrication in the upper cylinder head area….
What is knocking property?
Thus Knocking is defined as ,A sharp metallic sound similar to rattling of hammer, which is produced in the internal combustion engine due to immature ignition of the air gasoline mixture. Knocking causes loss of energy & damage to piston & cylinder. The knocking tendency of fuel increases with the composition.
Can engine knock Be Fixed?
Some of the ways in which you can fix engine knocking include: Upgrading the fuel that you put into your car and going with something that has a much higher octane rating. Putting additives into your car that are designed to clean carbon buildups….
How do I fix a rattling noise when I accelerate?
Rattling noises when accelerating can be caused by low fluid levels in the A/T. Open the hood and check the fluid level. If the car is running low on transmission fluid, refill the reservoir to the proper level. After doing this, start the car and take a short test drive to see if the problem goes away….
Can timing cause knocking?
If your ignition timing is over advanced, it means the engine is firing the spark plug too soon. When this happens, the air/fuel mixture ignites too early and causes detonation, which makes the knocking noise you hear. This can be extremely destructive to the engine and should be addressed immediately….