Search found 4905 matches

by Mike Everman
Sat Nov 08, 2003 2:14 am
Forum: Valveless pulsejet forum
Topic: Just Another Valveless Front End
Replies: 63
Views: 25347

Adjusted design

OK, it now has all the proper areas and lengths of segment to be equivalent to a Kentfield with 4" dia combustion chamber. Inlet lengths got us out of the vortex issue as now they cross.
I'll list some dimensions soon, have to go see Matrix 3 in two minutes.
Best Regards,
Mike
by Mike Everman
Fri Nov 07, 2003 3:15 pm
Forum: Valveless pulsejet forum
Topic: Just Another Valveless Front End
Replies: 63
Views: 25347

"fools seldom differ" (LOL) Glad you showed up, Mr. Simpson! that layout should look like your Coanda design, your design sparked me on all of this a few weeks ago. My problem with the cylindrical implimentation was I thought that the forward exhaust would be disinclined to crunch down and out the c...
by Mike Everman
Fri Nov 07, 2003 9:28 am
Forum: Valveless pulsejet forum
Topic: Just Another Valveless Front End
Replies: 63
Views: 25347

something similar

Here's something along the same lines that might be machinable in mirrored halves, maybe a chance at a mini since the NC contours will be so smooth.
got sidetracked.
by Mike Everman
Fri Nov 07, 2003 1:06 am
Forum: Valveless pulsejet forum
Topic: Just Another Valveless Front End
Replies: 63
Views: 25347

vortices

One more thing Viv's got me thinking about. What if there is a similar interlacing of intake streams in the CC, if we inject fuel in any or all of the high shear regions we'd get some good mixing, I think...
by Mike Everman
Fri Nov 07, 2003 12:58 am
Forum: Valveless pulsejet forum
Topic: Just Another Valveless Front End
Replies: 63
Views: 25347

Thanks Graham, I'm hooked. It's a good thing I have a full machine shop... Hmmm. Vortices... Can we harness that? Never mind. I'll be making some changes tonight to get the proper proportions based on the Kentfield dimensions. As to augmentation, I think I need to push forward the inlet diffuser (pr...
by Mike Everman
Thu Nov 06, 2003 5:43 pm
Forum: Valveless pulsejet forum
Topic: Just Another Valveless Front End
Replies: 63
Views: 25347

adjustability

Yeah, I think some adjustability is in order, especially since I am morphing this thing around so much from known geometry. Sure would be nice if I could adjust it while it's running... I sent Pieter the paper. Mike Oh, and Viv, I did some work for Motorola once, I like your tag line for them; they ...
by Mike Everman
Thu Nov 06, 2003 3:17 pm
Forum: Valveless pulsejet forum
Topic: Just Another Valveless Front End
Replies: 63
Views: 25347

Yes, exactly, it is essentially an 8 tube design. I'm clear with preserving the areas and lengths as shown in the 4-tube diagram, about the calculating level I'm up to without an in-depth design guide. Must I preserve the volume/internal surface area ratios by varying the section lengths? there is a...
by Mike Everman
Thu Nov 06, 2003 6:34 am
Forum: Valveless pulsejet forum
Topic: Just Another Valveless Front End
Replies: 63
Views: 25347

Proper sizing

Thanks to Bruno for the Kentfield paper. OK, so now I have some dimensions and I've made an excel converter to get it to rectangular sections. Do I keep the area relationships for all transitions and vary the lengths given to preserve the volume to surface area ratios? I think that's what I caught s...
by Mike Everman
Wed Nov 05, 2003 6:36 pm
Forum: Valved pulsejet forum
Topic: Extending Valve Life
Replies: 14
Views: 6988

Quasi-Laminar

Larry- Oh, now that is just sweet. A nice way to limit fatigue, but still needs ports and petals. No, scratch that, you could use two petal rings clocked so one's petals overlap the other's gaps, like the exhaust choke on a fighter jet engine. I liked also your ball valve on the Cyclodyne. I was thi...
by Mike Everman
Wed Nov 05, 2003 6:24 pm
Forum: Valveless pulsejet forum
Topic: Just Another Valveless Front End
Replies: 63
Views: 25347

Velocity head

Bruno,
As to velocity head, any thoughts on the fact that even during combustion phase air is being sucked into the intake? Seems as if incoming air is never stopped??
Mike
by Mike Everman
Wed Nov 05, 2003 6:20 pm
Forum: Valveless pulsejet forum
Topic: Just Another Valveless Front End
Replies: 63
Views: 25347

Kentfield dims

Boy, the response has been beyond expectations, and thanks. Private messaging appears not to work, so you can contact me at everspare@yahoo.com (at least that's my broadcastable address). I'll check it today. No luck on the patent search for Kentfield, so I appreciate the help. Is Hinote the fella t...
by Mike Everman
Wed Nov 05, 2003 2:59 pm
Forum: Valveless pulsejet forum
Topic: Just Another Valveless Front End
Replies: 63
Views: 25347

JAVFE

Thanks, Viv. Any links to Kentfield dimensions that work? I'll search for the any patents today. Should be an interesting looking section after converting from round to rectangular. Dreaming of a wide, flat engine suitable for embedding in an airfoil.
Mike
by Mike Everman
Wed Nov 05, 2003 6:31 am
Forum: Valveless pulsejet forum
Topic: Just Another Valveless Front End
Replies: 63
Views: 25347

JAVFE

Oh, yeah, I forgot to go on about "leaky" valves. Seems to me that the Lockwood is about as leaky as it gets and works great, with the benefit of inertia and colliding air masses (pardon my ignorance of terms). Saw a four tube front end on one of Bruce Simpson's valved jets and it struck me that it ...
by Mike Everman
Wed Nov 05, 2003 6:18 am
Forum: Valveless pulsejet forum
Topic: Just Another Valveless Front End
Replies: 63
Views: 25347

Just Another Valveless Front End

Thanks, Mike. I use Solidworks for designing. I've had a lot of fun with this one, haven't had much need for "lofted" sections in my robot designs (that's the term for how the intake/diverter channels blend down to a straight wall. I'm thinking about the forming tools I'll have to make eventually to...
by Mike Everman
Wed Nov 05, 2003 5:39 am
Forum: Valveless pulsejet forum
Topic: Just Another Valveless Front End
Replies: 63
Views: 25347

Just Another Valveless Front End

So, Hello to all. First post so be gentle. I don't think I've found a more intriguing problem than the "air diode" (or is it "flow diode"?) and its application to pulse-jet valving, it's got me awake in the wee hours. So without further ado, I present to you Just Another Valveless Front End (JAVFE)....