Pulsed Detonation Engine 5 Hz Ground Test

This video shows a 2007 test firing of a propane and oxygen fueled pulsed detonation engine at the UT Arlington Aerodynamics Research Center. The detonation frequency is 5 Hz. This engine features a 1 inch (inner diameter) pre-detonator using propane and oxygen and a 4 inch (inner diameter) combustor using a liquid fuel and air mixture. The ignition is based on an automotive system and auto spark plugs. This test was performed to test the various valving controls and the sensors (pressure, ion detectors, optical sensors, etc.).

Category:

Science & Technology

Tags:

• aviation
• aerospace
• engine
• detonation
• pulse
• pde

[cjarcus]

can this be used in space?

[emb8]

@cjarcus It can be operated in rocket-mode and work in space. However, the specific impulse then becomes about the same as a traditional rocket engine, so there is not much of an advantage considering the cost associated with developing it. Most of the potential applications are associated with high speed flight, where it could be integrated with a hybrid launch system.

[MrGunnaras]

question... how much thrust does it deliver at 25 hz? and what is the wieght of this thing? i.m wondering if its capable to give a lift of for a glider? and would it be economical compared to small combustion engines?

[Drcfan]

Fuel to Noise Converter

[mciceteade]

phoenixnavigation

[emb8]

@PeregrinusFalco I suppose that could be attempted, but it can only be played by itself since it is so loud. A flight-ready PDE might actually adjust its level of thrust by switching frequencies.

[softairwaffenfreak]

LOL???

[sethcat99]

Well this goes a long way in explaining those "ring" jet vapor trails left by the aliens. mhm

[smilingpug]

Jedi poodoo!

[emb8]

The website of this research center has a lot of publications available for download that explain many details of these engines. Compared to typical jet engines, there is a reduction in fuel that should translate to an efficiency increase - more like 10-20% instead of 50%. If by the backlash problems you mean the shock can travel back through the inlet, then yes that is a problem that is corrected with a valve that rapidly shuts for each detonation and then opens to let in more air.