What is preignition? Preignition is a phenomenon in the IC engine in which homogeneous fuel charge burned before the normal ignition starts ...
What is the difference between knocking and detonation?
“Knocking” and “detonation” are the interchangeable terms refers to the phenomenon of uncontrolled combustion in the IC engine. “Knock” is the sharp metal pinging sound produced in the engine due to uneven combustion. There are generally two theories for knocking. 1) auto-ignition theory and 2) detonation theory. These theories led many people to use the term detonation for knocking. In general, detonation is the cause and knocking is the after effect.
Abnormality in SI engine like detonation is depends on the rate of pressure rise in the combustion chamber. Since the rate of pressure rise directly related to the rate of flame propagation, it is very important to study about the factors affecting flame propagation. Important factors that influence the flame propagation is listed below.
Flame Propagation and Flame Speed Across the Combustion Chamber and Factors Affecting Flame PropagationAutomobile IC Engines
Flame propagation and flame speed
Flame propagation is defined as the progress (spread) of the flame inside the engine cylinder (combustible environment) outward from the point at which the combustion started. Flame generally propagates spherically. The rate of radial propagation of flame is known as flame speed. It is typically measured in m/s. It gives an idea about how rapidly fame propagates from a reference point. The flame speed determines the ability of a fuel to undergo controlled combustion without detonation.
What is sintering?Sintering is a thermal treatment technique of compacting and forming of solid material using heat and pressure without melting the main constituent (or without heating it to its liquefaction temperature). It is basically atomic diffusion. It will happen in any material at any temperature above absolute zero, but it is faster in higher temperature. When the heat is applied to powder compact, the average grain size increases, reducing the porosity and the compact gets densified. This basic phenomenon is known as sintering.
🔗EBM operating principle and working