rocket motor static test
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sounds like some good modifications.
if you are looking into the 3xx series SS take a look at 309 SS. it is a tad more expensive but has better high temperature performance. good luck!
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Why am I not surprised that you burned your wood test fixture? Shouldn't you account for hard starts? That is what look like happened.
doverdx 3 years ago
Thanks for your comment. The test fixture is steel and concrete. the shed doors are wood and they got a bit scorched. the failure was due to a chamber wall burn through at the nozzle throat due to inadequate cooling due to poor design. the start was not "hard". Chamber pressure never rose above 75 psi.
swankaerospace 3 years ago
oh. sorry about that.
what was your chamber made of? what was your injector pattern like?
in addition to regen, have you tried altering your injector pattern to create a gas film on the walls of your chamber? this may save you from burn-throughs...
doverdx 3 years ago
Chamber was made of copper. Turns out was too weak especially at elevated temperatures. The kersosene injector was a full cone BETE spray nozzle located in the center of a ring of n2o 'showerhead' injector holes. I was counting on an extremely rich mixture to keep chamber temps down. On next version I am planning for film cooling, a higher cooling jacket flow velocity and construction of 304 SS. I am on hold now for lack of funds.
swankaerospace 3 years ago