Search found 78 matches

by zono
Sat Jul 04, 2020 12:35 pm
Forum: Pressure jet forum
Topic: see running new type of pressure jet - methanol fuel
Replies: 33
Views: 16699

Re: see running new type of pressure jet - methanol fuel

insulated shroud and combustion chamber , inside view of combustion chamber, vaporizer coil and flameholder

flameholder edge and flameholder face marked-up yellow and red arrow:
by zono
Sat Jul 04, 2020 11:01 am
Forum: Pressure jet forum
Topic: see running new type of pressure jet - methanol fuel
Replies: 33
Views: 16699

Re: see running new type of pressure jet - methanol fuel

some meterings of the i-jet (ejector ramjet)
by zono
Sun Jun 28, 2020 4:40 pm
Forum: Pressure jet forum
Topic: see running new type of pressure jet - methanol fuel
Replies: 33
Views: 16699

Re: see running new type of pressure jet - methanol fuel

hints:

the unsteady combustion comes from the lack of pump pressure, formerly a bigger pump was applied, but I haven't already as powerful pump.

note : methanol vapor saturation pressure at 250 degC is about 100 bar !! And my little toy-pump in this video achieves just 8 - 12 bar.
by zono
Sun Jun 28, 2020 4:08 pm
Forum: Pressure jet forum
Topic: see running new type of pressure jet - methanol fuel
Replies: 33
Views: 16699

Re: see running new type of pressure jet - methanol fuel

here is the video again, the old link of which no longer worked is obsolete. The typical non-glowing flame of the methanol fuel is unfortunately hardly visible due to the glaring sunlight. At the end you can see them briefly. You can see other effects quite well, such as the rocking fuel tube, which...
by zono
Sun Jun 14, 2020 4:57 pm
Forum: Pressure jet forum
Topic: Axial (inline Gluey pressure jet engine)
Replies: 2
Views: 161

Re: Axial (inline Gluey pressure jet engine)

great work, Kevin !!

I love it ! We will put our knowledge together to improve this beast.
by zono
Fri Jun 05, 2020 6:47 pm
Forum: Pressure jet forum
Topic: see running new type of pressure jet - methanol fuel
Replies: 33
Views: 16699

Re: see running new type of pressure jet - methanol fuel

Dear kenshin, sorry, I didnt recognise your interesting posts, thank you very much! to your questions: yes , large diameter and combustion chamber length for stable combustion, and no, we had never trouble with combustion in diffuser, because the methanol vapor jet has enough momentum to supress com...
by zono
Fri Jan 05, 2018 5:42 pm
Forum: Valveless pulsejet forum
Topic: Valveless pulsejet-computational fluid dynamics
Replies: 39
Views: 15788

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: 39
Views: 15788

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: 39
Views: 15788

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: 1993

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: 67848

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: 22531

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: 67848

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: 13527

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: 67848

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