Quote from: tnphysics on 05/03/2010 08:29 pmWhy is it so difficult? What are the problems?Boron trioxide (the stable oxide) is like sand. At O/F 1.73, Pc of 1000psi, I get that 40% of the mass flow is Boron trioxide once you've expanded to atmospheric pressure. For a sea-level nozzle, the B2O3 would be a bunch of entrained liquid particles, they'd be little sand grains in a vacuum engine, which do not accelerate as well in a nozzle, and will bring down your Isp. With 40% of the flow being like that, it sounds like it could bring down your Isp a whole lot. That sound reasonable, Mr. Goff?
Why is it so difficult? What are the problems?
I thought more would be B2O3. Does it decompose at some high temperature?I was thinking 2B2H6+3O2->2B2O3+6H2Also, is that by mass or by moles?
Quote from: jongoff on 05/01/2010 07:51 pmQuote from: tnphysics on 05/01/2010 02:44 pmAlso, what kind of Isp would you get for B2H6/LOX? Use just enough LOX to burn the B (about 1.73 to 1 O/F). Assume 20MPa chamber pressure and altitude compensating nozzle. Engine start @ 40,000 ft.Boronated fuels have, at least from what I've heard, always been a big disappointment compared to theoretical calculations, and a real pain in the neck.~JonWhy is it so difficult? What are the problems?
Quote from: tnphysics on 05/01/2010 02:44 pmAlso, what kind of Isp would you get for B2H6/LOX? Use just enough LOX to burn the B (about 1.73 to 1 O/F). Assume 20MPa chamber pressure and altitude compensating nozzle. Engine start @ 40,000 ft.Boronated fuels have, at least from what I've heard, always been a big disappointment compared to theoretical calculations, and a real pain in the neck.~Jon
Also, what kind of Isp would you get for B2H6/LOX? Use just enough LOX to burn the B (about 1.73 to 1 O/F). Assume 20MPa chamber pressure and altitude compensating nozzle. Engine start @ 40,000 ft.
http://lmgtfy.com/?q=boronated+rocket+fuel :-)~Jon
Quote from: jongoff on 05/04/2010 03:24 amhttp://lmgtfy.com/?q=boronated+rocket+fuel :-)~JonOkay, the geek in me says, that was a way cool flame... ISP in the five hundreds?
Who/when/where was the first to discover the significance of maximum dynamic pressure as a driving environment?I think this is going to be a hard question.
Quote from: Antares on 05/28/2010 03:21 amWho/when/where was the first to discover the significance of maximum dynamic pressure as a driving environment?I think this is going to be a hard question.The NACA guys perhaps ? Faget comes to mind asone of the early guys who learned fast !!!