There are a few topics here about using a pulsejet as the flameholder for ramjet, but it occurs to me that you don't need the PJ to be the flame holder, you can use the PJ as the flame. The air in a ramjet doesn't need to burn, it just needs to be made hot by the time it goes out the back. You can do it with a heating element and the thing PJs do better than anything is get super hot. Imagine a valved PJ with an aerodynamic shell around it running through the middle of a ramjet body. This simplifies things a lot since you don't have to worry about most of the fiddly bits involved in ramjets.
IIRC the X-jet was supposed to have a full-length shroud. Maybe this is why? You could even add full-length fins to the PJ to maximize the amount of heat dumped into the ram air.
Now I understand there are issues with PJ intakes at such high speed but this issue seems a bit more solvable than getting them to work together in other ways.
Pulsejet-ram combo
Moderator: Mike Everman
Re: Pulsejet-ram combo
Sounds like a plan. build a small thermojet and measure thrust as-is. Slap a shroud around it, blow through it with a leafblower and check thrust again
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Re: Pulsejet-ram combo
I have since learned that what I proposed is called the Merideth Effect. WWII planes like the P-51 Mustang employed it by making use of the waste heat from the radiator to generate several hundred pounds of thrust from the exhaust duct. So at least I know the principal is sound.
http://en.wikipedia.org/wiki/Meredith_effect
http://en.wikipedia.org/wiki/Meredith_effect
Re: Pulsejet-ram combo
hehehesockmonkey wrote:So at least I know the principal is sound.
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Re: Pulsejet-ram combo
Hey guys ...
What about a "Pressure-Ram" combo ... ...
What about a "Pressure-Ram" combo ... ...
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Luc
Designer & Inventor
Designer & Inventor
Re: Pulsejet-ram combo
Hey Luc,
Can you upload future videos to youtube and then share the link? The 2mb limit is realy limiting.
Can you upload future videos to youtube and then share the link? The 2mb limit is realy limiting.
Quantify the world.
Re: Pulsejet-ram combo
Yeaaaa ... No problems .. I always forget to do this sorry ...
Cheers
Cheers
Luc
Designer & Inventor
Designer & Inventor