Sunday, October 14, 2007

Again one injector post

This time again for the AN injection. Well The ADN (Ammonium dinitramid) looks nice, but it is considered unavailable. Both technically and financially. The CAN (Ceric ammonium nitrate) has a melting point of about 108°C, so it could make a very nice alloy with the AN. Especially for its high reactivity with organic compounds.

Back to the injector or spray. One site here summarizes about all the injector nozzle types I have considered so far.

"Atomizer designs include co-axial air assist, liquid and air swirl, pizo-electric induced fluctuations, effervescent bubble atomization, rotating cup and disk. Electrostatic charging of droplets allows deflection of droplets in flight and avoidance of deposition on surfaces"

Well I did not consider electrostatics in helping the dreaded AN crust problem. Some possible solution is to lay the omega chamber in the piston with thermally insulating catalytic material, so that the AN could be deposited and boiled off and decomposed in case it comes in direct contact.

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