COMPREX(pressure wave supercharger) anyone ever see or use one
04-22-2007, 06:09 PM
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COMPREX(pressure wave supercharger) anyone ever see or use one
This is nothing new, and actually proposed to F1 back in the mid-20th century when they were turbocharged. The Comprex blower combines the best of both worlds. The Comprex is both exhaust gas and belt driven. It uses the belt off the crank to keep boost constant and uses the hot exhaust gas to spin the vanes inside the blower, while drawing in cold outside air. Unlike a turbo though, it reuses the exhaust gas, some of it at least. So if you run the engine nice and rich, you can reburn the unspent fuel after it has been compressed:
"Because the Comprex vanes only act to distribute gases, not push them, power is only needed to overcome friction of the rotating parts.
Now, take a model piston engine. Let it spin a small Comprex blower which blows into a ramjet-type combustor. There you have a simple hybrid jet engine that would work at very low and very high air speeds relatively happily.
You would just have to juggle the engine/blower/combustor dimensions carefully so that the engine is just big enough to do its job, and does not produce surplus shaft power.
There's more. Bleed some of the compressed air back to the piston engine to boost its power, so that you can use a small engine to turn a relatively big blower. (Comprex can spin at very high speeds as its vanes are of small diameter.)
Properly, you should run the engine as rich as it will take. After it has done the job of compressing air, exhaust gas is ejected into the ramjet/combustor, where it mixes with fresh air coming from the compressor. As it is still rich with unburned fuel, it only combusts properly in the ramjet. Fuel is injected into the combustor just to top the mixture up so to say. This way, because of recirculation, you also get a relatively clean exhaust.
Sounds complex, but need not be complex in practice.
Similar hybrids have worked really well in the past. Perhaps the most complex in history was the 12-cylinder 2-stroke (!) supercharged aircraft diesel (!) engine built by Napier in the (I think) early 60s. It burned super-rich mixture and blew its exhaust gas into combustors of a small turboshaft. More fuel was injected here and the resulting hot gas drove a turbine, which turned an axial compressor, which blew both into the 12-cylinder piston engine and into the combustors of the turboshaft. The two output shafts (of the piston engine and the turboshaft) were geared together to turn a single output shaft, which turned the aircraft propeller. It sounds incredibly complex but worked very well indeed and was a very fuel-efficient engine by the standards of the times.
Keith Duckworth, the constructor of the most successful car racing engine of all times, the Cosworth V8, proposed the same layout for Formula 1 back in the days of turbocharged F1 engines. He said it was the most logical extension of the turbocharged piston engine idea."
did some research and found these links
http://www.swissauto.com/uploa....pdf
http://www.swissauto.com/uploa....pdf
http://www.swissauto.com/uploa....pdf
any more info would be good i cant even figure out where you could buy one
"Because the Comprex vanes only act to distribute gases, not push them, power is only needed to overcome friction of the rotating parts.
Now, take a model piston engine. Let it spin a small Comprex blower which blows into a ramjet-type combustor. There you have a simple hybrid jet engine that would work at very low and very high air speeds relatively happily.
You would just have to juggle the engine/blower/combustor dimensions carefully so that the engine is just big enough to do its job, and does not produce surplus shaft power.
There's more. Bleed some of the compressed air back to the piston engine to boost its power, so that you can use a small engine to turn a relatively big blower. (Comprex can spin at very high speeds as its vanes are of small diameter.)
Properly, you should run the engine as rich as it will take. After it has done the job of compressing air, exhaust gas is ejected into the ramjet/combustor, where it mixes with fresh air coming from the compressor. As it is still rich with unburned fuel, it only combusts properly in the ramjet. Fuel is injected into the combustor just to top the mixture up so to say. This way, because of recirculation, you also get a relatively clean exhaust.
Sounds complex, but need not be complex in practice.
Similar hybrids have worked really well in the past. Perhaps the most complex in history was the 12-cylinder 2-stroke (!) supercharged aircraft diesel (!) engine built by Napier in the (I think) early 60s. It burned super-rich mixture and blew its exhaust gas into combustors of a small turboshaft. More fuel was injected here and the resulting hot gas drove a turbine, which turned an axial compressor, which blew both into the 12-cylinder piston engine and into the combustors of the turboshaft. The two output shafts (of the piston engine and the turboshaft) were geared together to turn a single output shaft, which turned the aircraft propeller. It sounds incredibly complex but worked very well indeed and was a very fuel-efficient engine by the standards of the times.
Keith Duckworth, the constructor of the most successful car racing engine of all times, the Cosworth V8, proposed the same layout for Formula 1 back in the days of turbocharged F1 engines. He said it was the most logical extension of the turbocharged piston engine idea."
did some research and found these links
http://www.swissauto.com/uploa....pdf
http://www.swissauto.com/uploa....pdf
http://www.swissauto.com/uploa....pdf
any more info would be good i cant even figure out where you could buy one
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