LES of the coaxial injection of liquid nitrogen and gaseous hydrogen under supercritical pressures

Rocket combustion chamber are machines with the largest energy density man has ever built. This requires enormous efforts in terms of the supply with propellants (e.g. 326 kg/s for the Ariane VULCAIN engine) as well as heat management to maintain structural integrity. The engines are tested at DLR Lampoldshausen but a proper design ahead of the extensive and expensive validation procedure reduced risk of failure during flight and increases reliability of the entire launcher system. Large Eddy simulations are currently capable of simulating the reacting flow from injection to the exhaust under supercritical conditions including the injection, drop breakup, evaporation and combustion. These numerical challenges require state of the art supercomputers in order to get the proper spatial and temporal resolution for these time resolved simulations. In order to ease on the computational effort, i.e. reduced combustion model ing is employed as well as models for the treatment of the flow close to the wall which is critical for accuracy but requires the largest resolution. To overcome these limitations, this project tackled the improvement of flamelet models for the harsh environments as well as the wall modelling, especially in presence of wall rough ness, for these environments.     «

Rocket combustion chamber are machines with the largest energy density man has ever built. This requires enormous efforts in terms of the supply with propellants (e.g. 326 kg/s for the Ariane VULCAIN engine) as well as heat management to maintain structural integrity. The engines are tested at DLR Lampoldshausen but a proper design ahead of the extensive and expensive validation procedure reduced risk of failure during flight and increases reliability of the entire launcher system. Large...     »