Tighter airvalves?
Moderator: Mike Everman
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Tighter airvalves?
Reading an old thread, I think Mike's first thread(?), I was looking at this picture and got an idea.
Fedde
In Mike's design the intakes are placed so that they don't blow at/in each other. Now what will happen if the intakes blow at each other:
Would it make tighter airvalves, causing higher combustion pressure in the CC?Fedde
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Re: Tighter airvalves?
I think this will stop the engine from breathing properly; it has nowhere to put its gasses and more importantly, suck in fresh air. The aditional pressure is likely going to mess up gassflow and stop the engine from running all together.
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Re: Tighter airvalves?
Well, that's exactly what I meant to happen. Like in a valved PJ.metiz wrote: ...it has nowhere to put its gasses..
I don't think so. Augmented intakes also don't breathe through the augmentors but from the sides, that is pressure-logic.metiz wrote: ...it has nowhere to suck in fresh air...
I am just afraid that still a part of the combustion gasses will escape and form a cloud around the intakes. Of course the PJ will then breathe in exhaust gasses and die
I think not. It will run like a valved PJ. Higher combustion pressure, more thrust out of the same length. But not anymore with inlet restricting, efficiency decreasing, valves.metiz wrote: The aditional pressure is likely going to mess up gassflow and stop the engine from running all together.
Let's build one , I'll do the welding
Fedde
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Re: Tighter airvalves?
ha! you're on! Whip up some plans and I'll build it....now if only I had some injectorsace_fedde wrote: Let's build one , I'll do the welding
Fedde
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Re: Tighter airvalves?
Something to keep in mind is that straight inlets shoot the exhaust charge clear of the intake area for some distance, so the engine isn't re-breathing much of the exhaust. Happy welding
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Re: Tighter airvalves?
Joe, did you get that I want to shoot the exhaust charge right into the other inlet?PyroJoe wrote:Something to keep in mind is that straight inlets shoot the exhaust charge clear of the intake area for some distance,
So that the inlets cannot breathe out, only breath in. Still a bit worried about breathing in exhaust gasses, might have to do some more thinking before welding
Fedde
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Re: Tighter airvalves?
This is a quickly sketched engine, to scale, that could be used for this app. I can't make bend pipes in sketchup so you'll have to inmagine those
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Re: Tighter airvalves?
I'm on it, I'm on it.
I also have some idea in mind, start thinking about the Kenny 4-inlet . Sketches will come later.
Btw, I have a "pijpenbuiger" (pipe bender). I have to check one of the coming days for which diameter pipe it is, then we can scale the design.
Fedde
I also have some idea in mind, start thinking about the Kenny 4-inlet . Sketches will come later.
Btw, I have a "pijpenbuiger" (pipe bender). I have to check one of the coming days for which diameter pipe it is, then we can scale the design.
Fedde
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Re: Tighter airvalves?
Joost,
I called today for the injector pipe, still no answer...
I called today for the injector pipe, still no answer...
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Re: Tighter airvalves?
In the next drawing you can see what my concern is. When the two exhaust streams collide and block each other, some gas will escape sideways (but won't have speed). That's exactly the area where the PJ is inhaling from:
So? a Kenny?
With four intakes the exhaust gasses have less room/directions to escape, see left in the drawing down here:
If we catch those gasses with a funnel (see right), we might prevent the PJ from inhaling exhaust gasses.So? a Kenny?
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Re: Tighter airvalves?
I like the kenny idea,
Here is what came to mind at first look of the design, basically using a plate with a hole a little larger than the flare to help seperate the exhaust from the intake, probably draggy. May work as is, ha.
Here is what came to mind at first look of the design, basically using a plate with a hole a little larger than the flare to help seperate the exhaust from the intake, probably draggy. May work as is, ha.
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Re: Tighter airvalves?
Joe,
In your design I think the exhaust gasses still have to much room to escape.
Metiz,
What you think of this one:
viewtopic.php?f=3&t=3044&st=0&sk=t&sd=a ... =15#p39668
Not big enough?
viewtopic.php?f=3&t=3044&st=0&sk=t&sd=a ... eld#p37719
Fedde
In your design I think the exhaust gasses still have to much room to escape.
Metiz,
What you think of this one:
viewtopic.php?f=3&t=3044&st=0&sk=t&sd=a ... =15#p39668
Not big enough?
viewtopic.php?f=3&t=3044&st=0&sk=t&sd=a ... eld#p37719
Fedde
Your scepticism is fuel for my brain.
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Re: Tighter airvalves?
Metiz,
These elbows I was planning to use for our experiment: The id of the tube that is meant to shift in is 13 mm. The elbows have at the ends an id of 15 mm, like the od of the tube.
At the bend they have an id of 13 mm.
The length of the centerline is around 35 mm.
As seen at the next photo, the dia of the CC should be around 70 mm if the intakes would have a lenght of 55 mm. On this photo I've (crudely) drawn the intakes with a lenght of 55 mm. It would be nice if the intakes could be slightly longer, and perhaps the CC's diameter could be around 70 or 80 mm.
Unfortunatly that doesn't fit your initial design which you send me earlier by PM: Could you...?
Thanks! Fedde
These elbows I was planning to use for our experiment: The id of the tube that is meant to shift in is 13 mm. The elbows have at the ends an id of 15 mm, like the od of the tube.
At the bend they have an id of 13 mm.
The length of the centerline is around 35 mm.
As seen at the next photo, the dia of the CC should be around 70 mm if the intakes would have a lenght of 55 mm. On this photo I've (crudely) drawn the intakes with a lenght of 55 mm. It would be nice if the intakes could be slightly longer, and perhaps the CC's diameter could be around 70 or 80 mm.
Unfortunatly that doesn't fit your initial design which you send me earlier by PM: Could you...?
Thanks! Fedde
Your scepticism is fuel for my brain.
Re: Tighter airvalves?
I don't think I can make the cc fatter AND make the intakes longer, only shorter with the given D of 13 mm...let me think about this for a while...brb
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Re: Tighter airvalves?
Right. slapped on a straight TP on the Minikenny. here are the dims. Nothing fancy though and CERTAINLY NOT to scale
(all done in mm)
(all done in mm)
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