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Dec 27, 2024 10:23

@Allie Anyway, yes, there will always be the Maxwellian tail, so that there are some chance that the fire starts from those quantum tunnelled particles (actually, basically all spontaneous ignition starts that way). The crucial point is that the heat liberated from those reactions need to be concentrated enough to be the ignition starter; if you have just one molecule reacting, then the generated heat is usually going to diffuse away. Not enough to start the fire going.

Obliv

Mar 2, 2024 04:44

so you can't close the loop with a different adiabat after ignition step?

John Rennie

Dec 14, 2022 07:24

Erm .. Google, Google .. aha, here.

Darwin Zou

Nov 16, 2022 00:13

national ignition fac..;

tpg2114

Jul 22, 2020 00:54

Successful detonation ignition, or creepy old man face...

PM 2Ring

Mar 7, 2020 16:31

@ACuriousMind :) It's not so much of an issue these days, with improved fuels (& fuel additives) & computer controlled ignition. But in the early days, dealing wirh carbon build-up was a problem.

roobee

Oct 25, 2019 04:28

it seems like a calorimeter uses electrical ignition? so electrical ignition is a reliable way to ignite difficult to ignite materials then?

Loong

Oct 3, 2019 14:29

Fuel saving device

Fuel saving devices are sold on the aftermarket with claims to improve the fuel economy and/or the exhaust emissions of any purport to optimize ignition, air flow, or fuel flow in some way. An early example of such a device sold with difficult-to-justify claims is the 200 mpg carburetor designed by Canadian inventor Charles Nelson Pogue. The US EPA is required by Section 511 of the Motor Vehicle Information and Cost Savings Act to test many of these devices and to provide public reports on their efficacy; the agency finds most devices do not improve fuel economy to any measurable degree, unlike...

PM 2Ring

Sep 18, 2019 11:37

As John Clark said of chlorine trifluoride in Ignition!: It is, of course, extremely toxic, but that’s the least of the problem. It is hypergolic with every known fuel, and so rapidly hypergolic that no ignition delay has ever been measured. It is also hypergolic with such things as cloth, wood, and test engineers, not to mention asbestos, sand, and water-with which it reacts explosively.

tpg2114

May 10, 2019 17:57

Ignition! is the title you're looking for probably

user351417

Apr 28, 2019 16:09

@JohnRennie Chem SE noticed our string of Ignition!-related posts.

Emilio Pisanty

Mar 1, 2019 12:58

0

Q: Relationship between structure and shock sensitivity for branched vs straight hydrocarbons and ammonium ions

In p. 137 of John D. Clark's Ignition!, Clark reports an interesting observation regarding the shock sensitivity of different isomers of alkyls and ammonium salts. Specifically, he says that he compared the sensitivity of tetramethyl ammonium nitrate ("Tallulah") in $\ce{N2O4}$ with the isomeric...

Emilio Pisanty

Feb 28, 2019 18:31

@Chair please remind me later that there's another chem.se follow-up question about p. 137 from Ignition

user351417

Feb 27, 2019 14:09

(top few messages here)

PM 2Ring

Feb 27, 2019 14:07

Unsymmetrical dimethylhydrazine? Sounds like someone's been reading John Clark's Ignition!

user351417

Feb 15, 2019 13:23

@EmilioPisanty Thanks for the recommendation! Ignition! is quite interesting. I never realized that popsci would contain interesting characters :P

user351417

Feb 10, 2019 16:05

@vzn EmilioPisanty was just talking about how he was reading Ignition; I think that one's a popsci book.

Emilio Pisanty

Feb 10, 2019 10:58

I think that that's the first time I saw Ignition! mentioned. @Chair will probably enjoy it, though. The whole Things I Won't Work With column is awesome.

user351417

Feb 10, 2019 10:49

amazon.in/Ignition-Informal-Propellants-University-Classics/dp/… sounds interesting!

Emilio Pisanty

Feb 10, 2019 10:48

I'm too busy reading John D. Clark's Ignition! at the moment

Anonymous

Oct 2, 2018 10:05

Chirped pulse amplification

Chirped pulse amplification (CPA) is a technique for amplifying an ultrashort laser pulse up to the petawatt level with the laser pulse being stretched out temporally and spectrally prior to amplification. CPA is the current state-of-the-art technique which all of the highest power lasers (greater than about 100 terawatts, with the exception of the ~500 TW National Ignition Facility) in the world currently utilize. Some examples of these lasers are the Vulcan Petawatt Upgrade at the Rutherford Appleton Laboratory's central laser facility, the Diocles Laser at the University of Nebraska-Lincoln...

Akash. B

Sep 30, 2018 13:31

@ACuriousMind In rockets you know ,they uses liquid oxygen for ignition ,right? .My question is " isn't the temperature of liquid oxygen -400 degree c ? how is it possible for it burn at high temperatures above 5000 degree Celsius ?

vzn

Sep 4, 2018 16:48

@EmilioPisanty "ignition" seems to have been reached. (for brief periods.) the field is looking for something like "self-sustaining"... trying to remember the terminology...

Emilio Pisanty

Sep 4, 2018 16:46

@JohnRennie I don't know whether fusion researchers would qualify the current funding for the field as a whole as sufficient to get them to ignition in 20 years' time

danielunderwood

Jul 31, 2018 21:33

@Green yeah the ignition voltage should be higher than the extinction voltage. You're looking for a Pachen curve I believe

enumaris

Jul 23, 2018 16:50

(and never actually achieved legit "ignition")

Slereah

Jan 29, 2018 12:47

I think the popular mean of ignition was a while was laser primed fusion

Future Historian

Jan 29, 2018 12:45

Basically a modern thermonuclear bomb using antimatter as the ignition mechanism instead of another fission bomb.

Secret

Jun 29, 2016 17:11

@0celo7
https://en.wikipedia.org/wiki/Methyl_nitrate
Perhaps less explosive than in wikipedia since methanol and nitric acid react 1:1 thus you will have 2 moles of methanol left behind that might dampen the detonation velocity of 6300 a bit (gas expansion caused by the ignition of the excess methanol not considered yet)

vzn

Feb 26, 2015 04:15

yes there is a lot of research... "national ignition facility" etc... 0ce do you want to do research after the masters?

vzn

Feb 26, 2015 04:14

fusion (not fission) applied, isnt that limited to mostly either atom bombs or "ignition" experiments?

user54412

Nov 20, 2013 02:47

@BrandonEnright It did not rxplofe, I'll have you know. I saw most of the first stage, and the entire second stage, including the pause between separation and ignition.

RhysW

Jul 24, 2013 19:19

their logic was the potassium metal acted as the ignition source,

anna v

Nov 3, 2012 05:18

@AlanSE I looked at the link you provided for fusion by accelerator. It is interesting. What you forgot to expand in your answer is that they are talking of "ignition" of plasma. It is not the igniter that provides the final energy, as spark plugs don't power the car. It is an interesting concept though.