What is the process of detonation?
The detonation process is based on repetitive explosions or detonations of oxygen-fuel gas mixtures, rather than the continuous burning of a combustion flame, as in the HVOF process. Oxygen and acetylene are loaded into a long, water-cooled barrel with powder. The mixture is ignited and it explodes.
What are the two theories of detonation?
Two nonideal theories, the detonation shock dynamics (DSD) theory and the streamline approach, are briefly introduced.
What is a detonation reaction?
Detonation involves a complex interplay of chemical reactions and energy transfer between lattice and internal molecular modes, leading to a steady shock wave at the front of the detonation and a self-similar release wave of expanding reaction products at the rear [1-3].
Is there a difference between explosion and detonation?
Explosion is a general term for an accelerated release of energy generating extreme temperatures, releasing of gases and expanding volume. Discovered in 1881 by French scientists, detonation is the result of a supersonic wave initiating a secondary explosion.
What causes detonation?
What Causes Detonation? The type of engine damage caused by detonation happens when a heat source within the combustion environment ignites the fuel/air charge prior to initiation by the engine’s ignition system.
Why does detonation occur?
Answer: Detonation, or engine knock, occurs simply when fuel pre-ignites before the piston reaches scheduled spark ignition. Detonation is generally caused by excessive heat, excessive cylinder pressure, improper ignition timing, inadequate fuel octane or a combination of these.
How do you stop detonation?
Detonation Elimination: 9 Ways to Prevent Engine Detonation
- #1. Up Your Octane.
- #2. Keep Compression Reasonable.
- #3. Check Your Timing.
- #5. Monitor the Mixture.
- #6. Blow out the Carbon.
- #7. Examine Your Knock Sensor.
- #8. Read Your Spark Plugs.
- #9. Consider Your Cooling System.
What are the 3 categories of high explosives?
High explosives are divided into three main categories, Primary (or Initiating) High Explosives, Secondary High Explosives, Boosters and Secondary High Explosives, Main Charge. As with many of the terms associated with explosions, there is also other terms that describe combustion explosions, “Deflagration Explosion”.
Is Bakugo’s quirk an emitter?
Possessed by Katsuki Bakugo, Explosion is one of the most powerful abilities in the world of My Hero Academia, and it also belongs to the class of Emitter type Quirks. Using its powers, Bakugo can produce nitroglycerin from his palms which he can then ignite to create powerful explosions.
What is a detonation wave?
A detonation is a supersonic combustion wave that consists of a shock wave driven by energy release from closely coupled chemical reactions. These waves travel at many times the speed of sound, often reaching speeds of Mach 5, as in the case of a hydrogen–air fuel mixture.
How do you fix detonation?
How can the detonation be controlled?
Investigations indicate that detonation may be controlled by retarding the rate of combustion by chemicals added to the mixture, which serve to increase its specific heat and prevent excessive temperature, and by reducing the temperature of the walls of the combustion-chamber, so that the temperature of the charge …
When does detonation occur in a combustion chamber?
Detonation occurs when excessive heat and pressure in the combustion chamber cause the air/fuel mixture to autoignite. This produces multiple flame fronts within the combustion chamber instead of a single flame kernel.
What happens if a detonation is left unchecked?
Detonation can cause catastrophic engine failure if left unchecked. That’s why most modern engines incorporate a failsafe in the factory tune to retard ignition timing or add fuel when a knock sensor detects too high of a knock count.
How does detonation affect a fuel injected engine?
Because detonation interrupts that design, it robs the engine of power. Most engines can handle some minor detonation. Modern, fuel injected engines can sense a knock and adjust the Air/Fuel Ratio and Ignition Timing. However, if the detonation is not fixed, it will damage the engine. Just one major detonation event could cause significant damage.
What does detonation sound in a car mean?
Detonation—sometimes called knock or pre-ignition—is a pinging sound that can sometimes be heard during acceleration and throttle tip-in. Unlike normal exhaust noise, detonation is a higher-pitched, raspy note that emanates from the engine compartment.