Search found 4923 matches

by Mike Everman
Mon Nov 10, 2003 7:30 pm
Forum: Valveless pulsejet forum
Topic: JAVFE Redux
Replies: 46
Views: 23280

Oh yeah, any views on pulsing vs. continous fuel injection?
Mike
by Mike Everman
Mon Nov 10, 2003 7:06 pm
Forum: Valveless pulsejet forum
Topic: JAVFE Redux
Replies: 46
Views: 23280

Cool Viv, thanks.
I just realized why I had a problem with the proportions of the original JAVFE! Damned flawed initial assumptions. Prepare to be Astounded! (or not...)
Mike
by Mike Everman
Mon Nov 10, 2003 4:28 pm
Forum: Valveless pulsejet forum
Topic: JAVFE Redux
Replies: 46
Views: 23280

2x4 upside the head

Bruno and Viv, You know, considering the pressures of both my customers and the economy here in the U.S., this is by far what I'd rather be doing all day. I am enjoying it immensely, too. I'd like very much to see both the Argus V1 and the Logan, if you have time to dredge them up and post them here...
by Mike Everman
Mon Nov 10, 2003 2:13 pm
Forum: Valveless pulsejet forum
Topic: JAVFE Redux
Replies: 46
Views: 23280

I'd have to, of course, change it's name to "Tornado".
I am hoping that impingement on the far wall will fill top and bottom well, but now: where to inject fuel? And you're just the guy to ask: How would a glow plug work for this?
Mike
by Mike Everman
Mon Nov 10, 2003 6:28 am
Forum: Valveless pulsejet forum
Topic: JAVFE Redux
Replies: 46
Views: 23280

JAVFE Redux

Getting down to something I think I can build, so I thought it warrants a fresh sheet. It's comparable to a Kentfield with a 4" dia combustion chamber, about 32" over-all. CC and exhaust are .094" sheet, tubes are OD.75x.040" wall welded to flanges. 4 M3 socket head cap screws per flange. Mark has r...
by Mike Everman
Mon Nov 10, 2003 5:45 am
Forum: Valveless pulsejet forum
Topic: Just Another Valveless Front End
Replies: 63
Views: 26227

...You could quickly store some created pressure in a large sphere like a capacitor stores electricity and reroute it to some other air gating track... Oh, yeah, baby! Now that's worth losing sleep over. I can do that with no moving parts! I'll bet you this laurel, and hardy hand-shake. Pure genius...
by Mike Everman
Sun Nov 09, 2003 11:03 pm
Forum: Valveless pulsejet forum
Topic: Just Another Valveless Front End
Replies: 63
Views: 26227

As for bends being problematic, please look at this Russian 'trombone'. I didn't mean that the bends will be detrimental, I meant that in order to design the starting point length of the intakes, I would need to know how bends effect the "apparent" length of the tube. all indications are that bent ...
by Mike Everman
Sun Nov 09, 2003 8:17 pm
Forum: Valveless pulsejet forum
Topic: Just Another Valveless Front End
Replies: 63
Views: 26227

Bruno- The depth of the concept engine in and out of the page, is 4". I made the tubes rectangular and vertically oriented to mimic the Kentfield inlet area required, and still have 2-3 times that area between them for the augmentor inlets. If I twist the tubes horizontally, they would have to go ov...
by Mike Everman
Sun Nov 09, 2003 7:50 pm
Forum: Valveless pulsejet forum
Topic: Just Another Valveless Front End
Replies: 63
Views: 26227

Thanks much, Bruno.
I want more than anything to twist the inputs, but can so far think of no way to then interleave them up above if I did. It's what led me to sketch up the mini one piece design concept, which essentially has one pipe.
Mike
by Mike Everman
Sun Nov 09, 2003 6:25 pm
Forum: Valveless pulsejet forum
Topic: Just Another Valveless Front End
Replies: 63
Views: 26227

2 as above but bend the top third of the tubes to opposed format as per your drawing layout. 4 or 8, I really want to preserve the inlets crossing the CC, so it's two bends. I still feel that flow through two bends in a pipe is going to have very different dynamics, and if we are going to tune the ...
by Mike Everman
Sun Nov 09, 2003 5:29 pm
Forum: Valveless pulsejet forum
Topic: Just Another Valveless Front End
Replies: 63
Views: 26227

Mark, you wax more poetic with each post. "Air diodes" reminds me of some study I did 20 yrs ago on fluidic circuits. It was wild stuff, maybe old news to you cats, but one can make any possible logic, amplifier or oscillator circuit with jets, walls, branches and control ports. the air force was do...
by Mike Everman
Sun Nov 09, 2003 4:20 pm
Forum: Valveless pulsejet forum
Topic: Just Another Valveless Front End
Replies: 63
Views: 26227

ah, the shout heard 'round the world!

And I was wondering if yesterday's light activity was because I finally exposed my colossal and insurmountable ignorance! I woke up at 5am (I think because I heard Bruno shouting half a world away) after an evening of messing with the original layout, see below. I'll take the comments in turn: the b...
by Mike Everman
Sun Nov 09, 2003 2:13 am
Forum: Valveless pulsejet forum
Topic: Just Another Valveless Front End
Replies: 63
Views: 26227

Graham- Point taken, I admit I'm a bit mired in details now that I have some dimensions to start with. The first one was a lot simpler, though a good deal out of proportion. I think I'll be taking your sound advice and re-evaluate the formed sheet intakes; perhaps I can make the proportions work, an...
by Mike Everman
Sat Nov 08, 2003 10:06 pm
Forum: Valveless pulsejet forum
Topic: Just Another Valveless Front End
Replies: 63
Views: 26227

Laminar flow bends

I don't know if I'm on the right track or whether it's of third order importance... but it's an attempt at making any path through the bent intake be the same length. It doesn't account for the natural pressure increase from inside radius to outside and it's effect on velocities from centripetal acc...
by Mike Everman
Sat Nov 08, 2003 8:59 pm
Forum: Valveless pulsejet forum
Topic: Just Another Valveless Front End
Replies: 63
Views: 26227

Laminar flow bends

Dave, How's this for a change in geometry? (brings my computer to it's knees, but sure looks cool.) First cut at getting the turbulence out of the turns. Path widens in the turns toward the inside of the bend to slow the flow down, matching velocity with all points outboard. In fact, I feel that any...