"Behavior of Particle Additives in the Turbulent Environment of a Solid Fuel Ramjet Combustion Chamber" and "Numerical Calculation of the Flow Behavior of Gelled Fuels in Impinging Jet Injector Nozzles"

Kurzfassung

Part I: The current study analyzes experimental data of the solid fuel ramjet combustion chamber investigation carried out at DLR Space Propulsion Institute Lampoldshausen. The behavior of metal particles in the hot gas flow was studied on a theoretical basis using the Basset-Boussinesq-Oseen (BBO) equation. The experimental set up for the data acquisition was a rectangular duct furnished with a backward facing step as flame holder in front of the solid fuel slab. Investigations on the particle following capability were carried out for experiments with and without combustion on two different cross sections. In the present work the particle behavior was examined for the large scale flow features only since the small scale movements are impossible to grasp based on the measured velocity profiles. Part II: Present Investigation is done at the DLR Space Propulsion Institute on the atomization of gelled fuels for the use as propellants for ramjets or other at space propulsion applications. One experimental set up consists of a doublet like-on-like impingement jet atomizer using very simply shared injector nozzles. A numerical investigation using the FE-tool ANSYS is done in the present work on the flow behavior of these gelled fuels in the injector nozzles. Computations are done on one nozzle with 0.5mm diameter at the outlet using two different viscosity models, the power law and the Bingham model. The calculations are performed for two types of gelled fuels both on Jet A-1, the Borchi-Gel and the Thixatrol-Gel. The solutions for the two models are compared for both fuels at 8 different cross sections. A short examination at one certain cross section for different nozzle outlet diameters closes the work.