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They are provided to help damp out combustion instabilities. The main injector uses cooled baffle elements, developed at Glenn in the 1960s to control pressure waves that could destroy the engine. Pressure waves in the space shuttle main engine combustion chamber are also controlled by acoustic cavities. Testing by Glenn engineers determined the ...


4

The ACES upper stage (in development at the moment) is being designed to do without an external source of pressurizing gas: Fundamentally IVF is a Hydrogen/Oxygen auxiliary power unit, that uses free boiloff hydrogen and oxygen to generate electricity (eliminating main vehicle batteries), provide autogenous tank pressurization (eliminating most or all ...


4

No, the Centaur with its RL-10 engines requires tank pressurization. Helium Supply and Pressurization System - Helium is the main pressurant used for tank pressurization. Typically, four 26-inch diameter high-pressure helium bottles mounted on the aft bulkhead are used for storage. They are made of a graphite/epoxy composite overwrap enveloping a ...


3

'tubes' aren't enough. You want an injector, in order to atomize the fuel and oxidizer and mix them. A simple one is the pintle injector, which has concentric openings for the fuel and oxidizer. Fuel being injected: and oxidizer: Other injectors have lots of openings alternating fuel and oxidizer, like the F-1 engine used in the Saturn V: You also ...


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