"Comprex" pressure-wave supercharger
"Comprex" pressure-wave supercharger
(OP)
Hello everyone, i wanna ask some questions about this device, it's very interesting method of air charging (to me), first question is: why this device was only used in diesel engines? (except Ferrari formula one experiments)? :)





RE: "Comprex" pressure-wave supercharger
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The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.
RE: "Comprex" pressure-wave supercharger
RE: "Comprex" pressure-wave supercharger
The Comprex is an interesting device but there are a whole lot of side effects.
Pressure waves operate at the local speed of sound, the Comprex is reliant on careful port timing, but the operating speed of the engine could vary by a factor of 10, so what do you set the port timing to??
Since it relies on pressure waves to purge each chamber out, what happens when the air filter gets clogged ... or someone backs up into something with the exhaust pipe and partially blocks it? A normal engine will shoot a potato out of the exhaust pipe pretty hard. What happens with one of these? A turbocharger doesn't have this problem.
The Comprex does not keep the intake and exhaust streams fully separated. There will inevitably be some gas exchange. Combine that with modern emission control systems that rely on very accurate air/fuel ratio control and don't like "unmetered air". Doesn't matter gasoline or diesel. A turbocharger doesn't have this problem.
RE: "Comprex" pressure-wave supercharger
je suis charlie
RE: "Comprex" pressure-wave supercharger
RE: "Comprex" pressure-wave supercharger
"Formal education is a weapon, whose effect depends on who holds it in his hands and at whom it is aimed." ~ Joseph Stalin
RE: "Comprex" pressure-wave supercharger
If the engine is running at light load (throttle almost shut) the pressure at the end of the intake stroke might be 1/3 of an atmosphere. Then it will be about 1 atmosphere at the end of the power stroke. There's no pressure-wave energy left.
RE: "Comprex" pressure-wave supercharger
RE: "Comprex" pressure-wave supercharger
RE: "Comprex" pressure-wave supercharger
Maybe someone can explain in detail how those shock wave reflection pockets help to extend "Comprex" operating range? Because without those pockets, operating range is quite limited :)
RE: "Comprex" pressure-wave supercharger
reflections." I strongly suggest you read the paper I linked and chase the references until your need is satisfied.
RE: "Comprex" pressure-wave supercharger
If you look at the paper linked by RodRico, the most attractive use of the device is as a HP compressor stage in a turbine engine, due to its capability to operate at relatively high speed, handle high air flows, give a high PR from its stage at good efficiency, and add minimal weight. In reality, there are very difficult problems to resolve, such as sealing of the rotor end faces. If someone can figure out a reliable method to solve these problems, this device could have a big market for use in turbine engines as a way to significantly increase PR, and thus improve TE/SFC.
RE: "Comprex" pressure-wave supercharger
RE: "Comprex" pressure-wave supercharger
je suis charlie
RE: "Comprex" pressure-wave supercharger