What is a pulse wave detonation engine?
A pulse detonation engine (PDE) is a type of propulsion system that uses detonation waves to combust the fuel and oxidizer mixture. The engine is pulsed because the mixture must be renewed in the combustion chamber between each detonation wave and the next. PDEs have been considered for propulsion since 1940.
How do pulse detonation engines work?
Pulse detonation rocket engines operate by injecting propellants into long cylinders that are open on one end and closed on the other. When gas fills a cylinder, an igniter—such as a spark plug—is activated. Fuel begins to burn and rapidly transitions to a detonation, or powered shock.
What is the difference between detonation and pre ignition?
Pre-ignition is the ignition of the air- fuel charge while the piston is still compressing the charge. Detonation – Detonation, as the name suggests, is an explosion of the fuel-air mixture inside the cylinder. It occurs after the compression stroke near or after top dead center.
How do you check for detonation in an engine?
How is it indicated?
- Knocking or pinging sound.
- Drop in Exhaust Gas Temperature (EGT)
- Broken piston rings and/or spark plugs.
- Damage to the piston and/or valves.
What damage does detonation cause?
Detonation will cause piston and ring damage, top ring groove wear, scoring, or piston scuffing and cylinder wall damage, sticking rings, loose head gaskets and possible bearing damage leading to complete engine failure. Detonation can be caused by: Lean fuel mixture.
How does a pulsed detonation engine work?
Pulsed detonation engines, also referred to as pulsed detonation wave engines :<3> “… use a shock wave created in a detonation — an explosion that propagates supersonically — to compress a fuel-oxidizer mixture prior to combustion, similar to supersonic inlets that make use of external and internal shock wave for pressurization.”
What kind of aircraft is the Aurora stealth?
Aurora is a top secret stealth military aircraft. Aurora is a stealth military aircraft, possibly British? (See Halo aka BAe HOTOL see below.). Aurora is also credited as the SR-91 Aurora.
When was the first sighting of the Aurora?
The first sighting of an aircraft believed to be the Aurora was in 1989, when it was spotted by Chris Gibson in the North Sea 100km off the coast of Norfolk.
When was the first aurora black aircraft made?
The term “Aurora” was first spotted on a 1985 U.S. National Defense Budget estimate for FY (fiscal year) 1986, which allocated $445,000,000 to “Black Aircraft Production” in 1987. However, when the National Defense Budget was submitted in 1987, the term “Aurora” had been removed.