I tried to imagine a way to make the whoosh bottle detonate. A whole lot of whooshing failure, followed by a single success, and a lot of fast moving shards of glass.
AFResearchLab channel on Facebook (YouTube channel soon) just live-streamed Rotating Detonation Rocket Engine test from Edwards AFB Wednesday 4/7/2022. Tune in to see AFRLs progress.
Always had an interest in pulse jet engines so this is fascinating. Thank you Scott.
So, apparently Pratt and Whitney have done something interesting of late.
The big problem with the pulse detonation wave engine is how to turn deflagration into detonation in shortest possible time. One possible solution is to use pressure waves to speed up the process. The most simple way to do this is to connect close ended pipe to the combustion chamber. As the combustion/detonation occurs pressure wave enters to the pipe. When this wave enters the end of the pipe it rebounds and returns back to the combustion chamber where fresh air/fuel mix has already ignited. It is the the speed,heat and the pressure of this rebound wave that will quicken the burning process and turn it into detonation wave. Could this work ?
I'm Scott Manley, fly safe.
First ramjet come in my mind (kind of)
It is a fletulent motor.
This is the engine that powered the Aurora, and it was exceedingly fast in terms of it's pulses. And apart of how it worked was similar to this, except the outlet pipes were in a circle, and used a rotating ignition cycle to generate the waves, however it wasn't a true rotating detonation engine, in that the wave that traveled around, initiated the pulse detonations and were not sourced from the rotating wave. the rotating wave simply initiated the pulse waves that are projected backward.
Love the animation at 4:45
What engine is in a black triangle plane ?
Does this have anything at all to do with aerospike rocket engines?
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Is the Russian A235 rocket using a detonation engine?
So great a presentation! One idea to add. Detonation can include explosives. A small explosive pistol can be used to maneuver in space. No bullets please. Gunpowder replaced with explosives like nitroglycerin.
Scott, do a video about rotating detonation engines with aero spike nozzles please!!
ADD A TESLA VALVE TO THE ROTATION CYLANDER
Polish scientists built a RDE engine and are testing it with a small rocket https://www.youtube.com/watch?v=bc9JmPlgBy8 It's better than Japan made as the rocket starts from the ground which is much harder. Japan rocket flown from the air.
So the SR-91 was no joke
Why did that make me think of Gordon Ramsey making creme brulee?
I feel I could make a smaller model of this engine (outer nozzle diameter of about an inch) using some common materials you could get at a hardware store. I feel a lot of this long winded stuff scares most people from attempting such an experiment for themselves but from what Ive seen from different models makes me feel making one isnt too complex or challenging. The only difficult thing is getting the flame front to turn into a detonation wave that travels around the circumference, and that could probably be fixed by turning it on and off a few times till you finally get the result you want, it seems thats what every other institute does so I dont see how anyone could literally make this in their backyard or shed and have it function
Hi, great video! have you considered the use of Tesla valves to control the direction of the propagating wave? this will not solve all issues but will help with predicting which direction the wave will move.
Super cool!
could you please try to explain what really happening in this discovery i have came across. Its not a detonation engine but it works the same....please watch this video I've made in this link. informative and awesome presentation!
It's been a little over a year since this was published - what's new? I would love to see a follow up of what has been learned in the last 18 months.... or even what you need to further the research and big challenges to overcome. great work!
Awesome presentation.
Thank You, found this very interesting!Excellent presentation for us engineering types, simplified enough for us to understand but not dumbed down to much... I am familiar with pulsed detonation concepts but previously never grasped the potential advantages of a rotating system and its stability problems. Remember reading something (Los Alamos report perhaps? ) long time ago about stabilizing combustion by electromagnetic means by MHD type action. Wonder if something like that could perhaps be used to force the desired mode in the combustion chamber.
I feel like the most interesting question is how many waves do you need to maximize the thrust generated over the long term (particularly what do you need to do to have the thrust/weight of contraption be greater than 1)?
this man made very expensive software loading iconsall jokes aside, there's some quality research and presentation here!
Speak to you audience. Few of us have PHDs. Many don't have masters. Some have bachelors w/ post grad studies. Loose the big words, talk to us on OUR terms, you've failed!
Could you kick up the 4d3d3d3?
This video has attracted kind of an oddball audience. This is not some science video, its effectively the presentation component of a doctoral defense. Dr. Koch is shown presenting the topic of his dissertation completed last year (when this video was posted), which is the title of the talk. Thats it. Its understandable for the general, educated public to not recognize the norms of professional academic research, including the people who are blown away even though they have a BSci in engineering or physics. But the people trying to pick apart his vocab etc. either for understanding or for critique are way off-base. Knowing what radial means does not bring you close to understanding a normal PhD defense in aeronautics. Yes, theres nothing abnormal or abnormally prodigious about this talk, but getting a research PhD in a field is a pretty big deal, and now I guess more people know why. Now you know how far a Bachelors and even a Masters are from a completed PhD in a discipline. As of 2021 Koch is a postdoc in Texas. In other words, not even a professor yet. And it may be a few years still, of even more research, more publications, more grants, etc. before someone like Dr. Koch is offered a tenure-track position (if he wants to stay in academia, vs. industry) at a university. So now you know how far away all of your professors were from you in basically every uni class youve been in (albeit not all classes are taught by professors per se). Anyway, as a rule, dissertations contain much better explanations of the principal research than the overly brief papers based on them (as linked in the description), so here is Kochs actual thesis: terms please!
Its incredible how the turbo flux encabulator can encorporate twice the texel density, virtually rendering vertical flex inhibited.
All of this to predict how to build an F-1 size engine with a low probability of spontaneous rapid disassembly.
Would make a swell leaf-blower.
Can you explain the method how to prevent backflow of ignition products.
I get what he saying for the most part, but for presentation purposes, ya gotta dumb it down. Could have explain it in half the time with layman terms.
This is awesome, I accidentally made something similar whilst trying to make a rocket engine, it had no spark plug but did have rapid detonations inside the engine. Could you tell me how yours ignites/detonates? I would assume you have a spark plug with timed ignition but then again Im not sure. Cool stuff you have earned another subscriber
With a pulse detonation the Shockwave should be supersonic would that not convert into a pressure wave which could be measured with an air/wind speed meter?
So how exactly did you get detonations to occur and what do you think made the design special so that it actually works? I had some success with a pulse jet 2 years ago but never knew how to make pulse detonation engines or rotating detonation engines
Very neat video. I've read literature that said they could get small hydrogen-air pulse detonation engines to run at over 100hz. Obscene efficiency and the power to weight to boot. With how simple these things are I'm shocked they aren't used in hobby planes or rockets or something similar. There have also been some recent advancements in rotating detonation engines that seems really exciting.
what the deference of detonation and deflagration sir?
Going back 45 years or so to my undergraduate lectures , I can say that these lectures are of a higher quality that those on an Engineering science degree at Oxford. The west should look out.
Sir..Can you prefer me a book in which these data are available
40:46 The energy balance equation at the top is correct. Presumably, the delta can be computed (as a function of v and the auto-ignition temperature) by setting the energy flux produced within the flame thickness equal to the energy flux transported out? May the auto-ignition temperature as a function of activation energy and the burned gas temperature in turn be approximated as the temperature of the inflection point in the reaction rate? May we use the Hughoniot relation to compute (the minimum...) v as a function of the auto-ignition temperature and the unburned gas temperature? Finally, should (the minimum...) R (= R*?) be set equal to the quenching distance (for the cylindrical geometry...) as a function of the activation energy, the auto-ignition temperature, and unburned gas density? Then the top equation can be be solved for the MIE as a function of activation energy, net chemical energy released per unit mass, burned gas temperature, unburned gas temperature, and unburned density? If such a MIE were released at r=0, would the blast wave track into the Hughoniot curve with the temperature dropping to the auto-ignition temperature before the quenching radius is reached and eventually climb back to the burned gas temperature when R is significantly larger than the quenching radius? Finally, how do the wind speed and the pressure behind the blast wave scale as functions of r/R?
Lecture on ic engine should be include
Valve timing and port timing diagrams wexplain that where to place protractor while drawing
Very Good Teaching
very helpful lecture...................................
Can anyone send me the link of all lectures.
I cant understand u speak hindi also. we are indian soo plzz use hindi , se in world every country use our languages like china use chines language , arab counrty use arby why we cant use hindi we are shanfull on us we do not care our mother tounge language and our coutry culture do not forget our county this is kindly request to all guys, senior
thanks a lot!!
Very very THANK U SIR
awesome explanation sir.