Why are detonation engines more efficient?
The key advantage of detonation combustion is that it generates pressure gain in the system, compared to the pressure loss produced by deflagration combustion. RDC designers aim to capture as much of that gain as possible, so that more energy is wrung out of a given amount of fuel, Claflin says.
How does a pulse detonation engine 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 a pulse detonation wave 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.
What are pulse jets used for?
Pulsejets are used today in target drone aircraft, flying control line model aircraft (as well as radio-controlled aircraft), fog generators, and industrial drying and home heating equipment.
What is oblique detonation wave?
One specific CDE concept is known as the oblique detonation wave engine (ODWE), where the inlet and combustor make use of a fixed oblique shock that heats up the fuel/air mixture so it immediately detonates.
What are rotating engines?
rotary engine, internal-combustion engine in which the combustion chambers and cylinders rotate with the driven shaft around a fixed control shaft to which pistons are affixed; the gas pressures of combustion are used to rotate the shaft.
How efficient are pulse detonation engines?
The thermodynamic efficiency of Pulse Detonation Engine has greater efficiency of 50 percentage than that of constant pressure cycles of Gas Turbine/Scramjets/Ramjets which is of 35 percentage when compared.
Is knocking and detonation same?
Detonation is an uncontrolled combustion event which occurs after the spark event. Pre-ignition is an uncontrolled combustion event which occurs before the spark event. Knock (pinging) is the actual noise that can be audibly heard if detonation is bad enough.
What is a hypersonic engine?
A scramjet (supersonic combustion ramjet) is a variant of a ramjet airbreathing jet engine in which combustion takes place in supersonic airflow.
What is a pulse detonation engine?
The Pulse Detonation Engine (PDE) is an experimental propulsive device that uses supersonic detonation waves as a combustion mechanism. In theory, the PDE design offers numerous advantages over traditional gas turbine engines, including improved efficiency and reduced mechanical complexity. 
What are the disadvantages of pulse-detonation engines?
The major difficulty with a pulse-detonation engine is starting the detonation. While it is possible to start a detonation directly with a large spark, the amount of energy input is very large and is not practical for an engine.
What is the difference between a pulse detonation and a deflagration?
Unfortunately, detonations are many times louder than deflagrations. The major difficulty with a pulse-detonation engine is starting the detonation. While it is possible to start a detonation directly with a large spark, the amount of energy input is very large and is not practical for an engine.
How does a PDE engine work?
The basic operation of the PDE is similar to that of the pulse jet engine. In the pulse jet, air is mixed with fuel to create a flammable mixture that is then ignited in an open chamber. The resulting combustion greatly increases the pressure of the mixture to approximately 100 atmospheres (10 MPa), which then expands through a nozzle for thrust.