The Titan 2 engines were tube bundles with a (metal) wire over wrap. I’ve
also seen one amateur solid that used very thin wall stainless with a wire
over wrap, which worked fine w/ micrograin.
At Amroc we built the composite cases in the usual manner and then added
phenolic tubes top and bottom and did a continuous overwrapped of those to
build the “y” joint and the upper and lower tube sections, which is a
variant of the same idea.
Bill
On Tue, Oct 3, 2017 at 11:01 AM Ben Brockert <wikkit@xxxxxxxxx> wrote:
Filament winding has issues with sealing. The technology for linerless
tanks is fairly closely guarded by the companies that claim it. So for
the first one to not be a pain to build, you'd still want to seal the
channels before winding it.
Two engineering challenges I see would be the differences in young's
modulus and CTE. The difference in CTE between the liner and jacket
leads to cracking in the channels for reusable engines. The young's
modulus will mean that the chamber will carry little or none of the
chamber pressure vessel loads, which is common in disassembleable CSJ
engines but less common in fully bonded engines.
For an expendable engine if you could fully automate the winding it
might be interesting. Tube bundle engines typically have reinforcement
bands on them, this is a modern take on that.
A similar take on this approach for tanks is to have full thickness
domes welded/bonded to minimum gauge walls, then just wind on the
outside without spending a lot of time getting the tricky windings
around the domes correct.
Ben
On Sun, Oct 1, 2017 at 11:14 PM, Lars Osborne <lars.osborne@xxxxxxxxx>
wrote:
I've got a dumb question:seems
The challenge of making large regenerative engines for reduced costs
to focus on constructing the outer jacket. Traditionally this was donewith
nickel plating, newer techniques include explosion forming, brazing onoff
sheets, and other stuff.
Has anyone considered filament winding composites? Perhaps I am just way
on the typical temperatures on the outside of the cooling jacket, butthey
are supposed to be somewhat cool compared to the rest of the engine.There
are some composites that can work in the 250-300 degree C range. Am I
underestimating the typical temperatures of the outside cooling jacket or
are there severe complexities (other than the obvious ones)?
Thanks,
Lars Osborne