Abstract
Difficulties in Defining the Degree of Superheat in Flash Boiling Liquid Nitrogen Sprays
Highlights
Technology development for propulsion systems of upper stages like the cryogenic Ariane 6 upper stage engine Vinci or for future cryogenic thrusters in reaction control or orbital and manoeuvring systems is driven by the invention of new, green propellants to substitute hydrazine, and by new ignition technologies like laser ignition [1]
At high-altitude conditions prior to ignition the liquid propellants are injected into the combustor at near-vacuum conditions
Within an experimental study at DLR Lampoldshausen about laser ignition in a model rocket combustion chamber at high-altitude conditions, flash boiling was observed for a liquid oxygen (LOX) jet [9]
Summary
Technology development for propulsion systems of upper stages like the cryogenic Ariane 6 upper stage engine Vinci or for future cryogenic thrusters in reaction control or orbital and manoeuvring systems is driven by the invention of new, green propellants to substitute hydrazine, and by new ignition technologies like laser ignition [1]. A superheated liquid jet with a high degree of superheat is atomized close to or already in the injector nozzle due to vaporization and produces a fine spray with a big opening angle and small droplets.
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