Search found 11 matches

by krzys Mnich
Thu Jan 13, 2011 9:10 am
Forum: Unconventional, Multi-Mode and Hybrid Jets
Topic: Gatling jet
Replies: 0
Views: 2411

Gatling jet

Hi, this is an old, well-known idea of the wave rotor combustor, but I've never heard of anybody, who tested it as a standalone jet engine. When made in garage, it could look just like a Gatling gun. gatling_cycle2.jpg Imagine a bundle of metal tubes, rotating between two plates. Each tube works as ...
by krzys Mnich
Tue Sep 22, 2009 5:10 pm
Forum: Valveless pulsejet forum
Topic: Yet another pulseramjet
Replies: 1
Views: 1355

Yet another pulseramjet

Hi, the idea is not new, but the design looks pretty elegant. First the theory: rear intake pulsejets, like Lockwood or Chinese, work well at low speed, but at high speed they become worse, and at supersonic speed, I guess, they don't work at all. It's not easy to build a valveless, that work well i...
by krzys Mnich
Mon Sep 14, 2009 8:41 am
Forum: Ramjet forum
Topic: Static Ramjet?…
Replies: 15
Views: 9228

Re: Static Ramjet?…

Here you can find another concept (by Foa) of the static ramjet: http://www.google.com/patents/about?id=q5MtAAAAEBAJ&dq=3,046,732 The idea of unsteady-flow ejector ramjet is still alive. In this supersonic ejector ramjet no moving parts are required http://www.google.com/patents/about?id=XwIlAAAAEB...
by krzys Mnich
Sun Sep 13, 2009 8:10 am
Forum: Unconventional, Multi-Mode and Hybrid Jets
Topic: Very simple pulse turbine
Replies: 5
Views: 4091

Re: Very simple pulse turbine

The low pressure area is outside of the chambers, so none of them will eject into the next chamber like the brown arrows show. Instead, almost all flow will follow the outside path. Yes, I suspected my stupid mistake. The flow like the brown arrows can happen for the outer area much smaller than th...
by krzys Mnich
Thu Sep 10, 2009 12:14 pm
Forum: Unconventional, Multi-Mode and Hybrid Jets
Topic: Very simple pulse turbine
Replies: 5
Views: 4091

Very simple pulse turbine

Hi, this is so simple, that somebody must have tried it... pultur.jpg There's nothing but a simple vane rotor in a chamber. The rotor works as a rotary valve, then it forms closed combustion chambers, and at last it works as a primitive turbine. One can't expect great efficiency, but the simplicity ...
by krzys Mnich
Mon Sep 07, 2009 8:10 pm
Forum: Ramjet forum
Topic: Static Ramjet?…
Replies: 15
Views: 9228

Re: Static Ramjet?…

Here you can find another concept (by Foa) of the static ramjet: http://www.google.com/patents/about?id=q5MtAAAAEBAJ&dq=3,046,732 The very tricky "aerodynamic blade" ejector can allow you to obtain the initial pressure. It has, however, one moving part. The similar device is now developped as a part...
by krzys Mnich
Fri Sep 04, 2009 1:17 pm
Forum: Gas turbine forum
Topic: Pressure exchanger turbine
Replies: 0
Views: 1413

Pressure exchanger turbine

Hi, Bruno Ogorelec wrote once, that wave rotors are one of the famous lost causes of aerospace industry , because no one knows what to make the pesky rotors out of . OK, but there were some ideas similar as wave rotors, possibly not as demanding. Look here: http://www.google.com/patents/about?id=arl...
by krzys Mnich
Tue Feb 24, 2009 2:58 pm
Forum: Valveless pulsejet forum
Topic: Marconnet as a tricky intake
Replies: 3
Views: 1606

Re: Marconnet as a tricky intake

Hi Larry, You are probably right about the original Marconnet design. Your description explains its features very well. There were, however, some "Marconnet style" pulsejets of surprisingly good performance. I realize, that they are little connected with the original Marconnet patent, but they are s...
by krzys Mnich
Sat Feb 14, 2009 6:28 pm
Forum: Valveless pulsejet forum
Topic: Marconnet as a tricky intake
Replies: 3
Views: 1606

Marconnet as a tricky intake

Hi, last night I thought about the old Marconnet design. Could it be more than a "bad ramjet"? It's well known, that a diffuser should be long and smooth, with a small cone angle, to avoid the flow separation. On contrary, the cone angle of a convergent nozzle can be much bigger. Consider an asymmet...
by krzys Mnich
Wed Jul 23, 2008 7:07 pm
Forum: Ramjet forum
Topic: regenerative ramjet engine
Replies: 22
Views: 15618

Re: regenerative ramjet engine

Thank you, Mike, for the welcome. Larry, could you find more about the patent you mentioned: One of the most sophisticated designs I saw didn'r even have a physical boundary between the two streams, just a kind of "shear plane" between the hot and cold air. It had a patent description about eight pa...
by krzys Mnich
Tue Jul 22, 2008 8:22 pm
Forum: Ramjet forum
Topic: regenerative ramjet engine
Replies: 22
Views: 15618

Re: regenerative ramjet engine

I guess many people thought out an engine like this, however, not many of them calculated it. I did, many years ago - and it cannot work, unfortunately. The point is, that the intake air is accelerated by the exhaust gas, but also heated by it. The hot air can't be efficiently compressed, and it is ...