Search found 72 matches

by zono
Fri Jan 05, 2018 5:42 pm
Forum: Valveless pulsejet forum
Topic: Valveless pulsejet-computational fluid dynamics
Replies: 37
Views: 5704

Comsol Multiphysics: Valveless pulsejet-computational fluid dynamics

hi all, here are two examples of my linear-acoustics Simulations (CFD for poor) elaborated with Comsol Multiphysics 4.3 : ... afwe-eigenfrequency-helmholtz4-harmonic-pipe-end_corrected-1 : acoustic eigenmodes of a so-called "harmonic-design" (I will report on this theory in the next weeks / months) ...
by zono
Mon Jan 01, 2018 9:57 pm
Forum: Valveless pulsejet forum
Topic: Valveless pulsejet-computational fluid dynamics
Replies: 37
Views: 5704

Re: Valveless pulsejet-computational fluid dynamics

Dear Ganesh,

first I wish a happy New Year to all forum users!

Hopefully I will have a little more time next days to seek for my old simulation results images and animations done by Comsol Multiphysics

so long !

zono
by zono
Sun Dec 17, 2017 12:38 am
Forum: Valveless pulsejet forum
Topic: Valveless pulsejet-computational fluid dynamics
Replies: 37
Views: 5704

Re: Valveless pulsejet-computational fluid dynamics

Dear Ganesh, nice work here! Some time ago I did some CFD on valveless pulsejets using Comsol Multiphysics. There I used compressible NS formulation and an additional heat-source term as pseudo-combustion. Later I will send some images of that. Your attempt to create a free / opensource code for oct...
by zono
Sun Dec 11, 2016 11:55 am
Forum: Pulse detonation engine forum
Topic: Some noob ideas for initiator
Replies: 1
Views: 1072

Re: Some noob ideas for initiator

nice ideas. please have a look on my posts in thread "predator". This works vaveless without shockwave primers by just initiating high turbulences by the propane injector. But with very low pulse-frequencies. Initiating electrical shocks by capacitor banks are anyway interesting alternatives. Can yo...
by zono
Tue Jul 29, 2014 7:03 pm
Forum: Valveless pulsejet forum
Topic: M500 build log
Replies: 161
Views: 41457

Re: M500 build log

uuuuaaaaaahhh !!!

I am amazed !!! what a beast...

well done metiz, and get well soon !
by zono
Sun Jun 15, 2014 9:31 pm
Forum: Pulse detonation engine forum
Topic: PREDATOR - valveless PDE build blog
Replies: 35
Views: 16547

Re: PREDATOR - valveless PDE build blog

Hi Growlzler,
aah, as I understand, you propose to bias a direct current just below the trigger point of the coil? Is that right? This seems to be a very good idea...

thanks, I will try...if I got it right? Other ideas?
by zono
Thu Jun 12, 2014 11:21 am
Forum: Valveless pulsejet forum
Topic: M500 build log
Replies: 161
Views: 41457

Re: M500 build log

I am afraid, 300 kg will not last ;-)
by zono
Fri May 09, 2014 4:24 pm
Forum: Valveless pulsejet forum
Topic: Short Lady Build Log
Replies: 33
Views: 7378

Re: Short Lady Build Log

Hi, great to hear from new members! I try to give some answers : 1) Would small welding beads inside the CC hinder the performance? no 2) I tried to make the transition from the cone to the tail pipe as smooth as possible but i did end up with a few welding beads there. They are a bit hard to reach ...
by zono
Sat May 03, 2014 9:57 pm
Forum: Valveless pulsejet forum
Topic: M500 build log
Replies: 161
Views: 41457

Re: M500 build log

hope, we will meet you and your Beast at the "Days of Speed and Thunder" 29th-31th May?

see here: http://www.pulsotriebwerk.de/

PS: there will be also many other dutch pulsejet-freaks
by zono
Sat May 03, 2014 9:29 pm
Forum: Pulse detonation engine forum
Topic: PREDATOR - valveless PDE build blog
Replies: 35
Views: 16547

Re: PREDATOR - valveless PDE build blog

Here ist some (poor) update. I purchased more suitable mosfets with lower R_ds(on) and lower Ugs, that helps for signal steepness at the ignition coil. But my solenoid valves still have 20ms trigger time. Piezo valves available only for low pressures and low flow rates.

Any ideas?
by zono
Fri Aug 02, 2013 1:47 pm
Forum: Pulse detonation engine forum
Topic: Hello detonation "you look great"
Replies: 22
Views: 6582

Re: Hello detonation "you look great"

normally you have one open and one closed end (?). if you do like my valveless PREDATOR, you have one open, and one ~75% closed end with an injector. no moving parts :o
by zono
Sun Jul 28, 2013 9:19 am
Forum: Pulse detonation engine forum
Topic: Hello detonation "you look great"
Replies: 22
Views: 6582

Re: Hello detonation "you look great"

good works, ganuganu ! Did you use prepared reaction mechanism out of other combustion cases, or did you setup all ~100 basic reactions by yourself? I am working with Comsol Multiphysics and love single step reactions with coupled igniton mechanisms (combustion as a simple heat source). Simulations ...
by zono
Sun Jul 01, 2012 6:04 pm
Forum: Pulse detonation engine forum
Topic: PREDATOR - valveless PDE build blog
Replies: 35
Views: 16547

Re: PREDATOR - valveless PDE build blog

Hi guys, its's good to hear, there is still interest on these items. @ metiz: PDE means Pulse Detonation Engine - that are detonation pulses, no continuous run ;-) ...but no kidding, you are right, pulse rate can be increased from now 1.4Hz to about 5...10 Hz by using high pressure gas injection and...
by zono
Sun Jun 24, 2012 4:00 pm
Forum: Pulse detonation engine forum
Topic: PREDATOR - valveless PDE build blog
Replies: 35
Views: 16547

Re: PREDATOR - valveless PDE build blog

hmmmm

nobody left in the PDE forum? Nobody interested any more? Not even defense industry ;-)

have a look above. New runs done in May 2012.
by zono
Sat Jun 09, 2012 10:02 pm
Forum: Pulse detonation engine forum
Topic: PREDATOR - valveless PDE build blog
Replies: 35
Views: 16547

Re: PREDATOR - valveless PDE build blog

and here are the vids:

http://www.youtube.com/watch?v=Nn9I1RXT0TM&feature=plcp

http://www.youtube.com/watch?v=TYLmpxKcnDM&feature=plcp

Detonation shockwaves had awsome intensity. They destroyed parts of my test rig (momentum gauge)