Re: Falcon 9 v2.5 (Block 5)
Napsal: 14.5.2018 12:29
takze se nebude stahovat vykon na MaxQ ? Pokud pojedou konstantne tak by to prece nemelo byt nutne
Na Max-Q se stahuje výkon vždycky, ale k tomu ještě regulují tlak v komoře, aby nerostl tah vlivem řidší atmosféry.
Jestli ten tlak regulují změnou směšovacího poměru v kombinaci se škrcením obou složek PHM, to zatím není jasné.
Z dřívější doby od Toma Muelera víme, že Musk nutil konstruktéry motoru zapracovat na redukci počtu ventilů - aby na Merlinu (Raptoru) bylo co nejméně pohyblivých = drahých a pracných komponentů a regulační funkci ventilů vyřešili jinak (například rozdílnou délkou a průměrem potrubí, face-shutoff). Nakolik tento požadavek splnili už teď z hlavy nevím, ale asi se to dá někde dohledat.
Edit: Muelerův popis vývoje M1D bez ventilů: https://zlsadesign.com/post/tom-mueller ... scription/
"...And, uh, I’ve seen that hurt us before, I’ve seen that fail, but I’ve also seen— where nobody thought it would work— it was the right decision. It was the harder way to do it, but in the end, it was the right thing. One of the things that we did with the Merlin 1D was; he kept complaining— I talked earlier about how expensive the engine was. [inaudible] [I said,] “[the] only way is to get rid of all these valves. Because that’s what’s really driving the complexity and cost.” And how can you do that? And I said, “Well, on smaller engines, we’d go face-shutoff, but nobody’s done it on a really large engine. It’ll be really difficult.” And he said, “We need to do face-shutoff. Explain how that works?” So I drew it up, did some, you know, sketches, and said “here’s what we’d do,” and he said “That’s what we need to do.” And I advised him against it; I said it’s going to be too hard to do, and it’s not going to save that much. But he made the decision that we were going to do face-shutoff."
