Jens von Kampen

Characteristic Flow and Spray Properties of Gelled Fuels with Regard to the Impinging Jet Injector Type

The flow and spray behavior of various gelled fuels, which are non-Newtonian shear-thinning fluids, is presented and compared. The present publication gives an overview about rheological properties, some aspects of the flow characteristics and of the atomization behavior of investigated gels with a doublet like-on-like impinging jet injector. Different breakup modes were observed in dependence of the jet exit velocity on the obtained shadowgraph images. Furthermore they are presented in a regime diagram with the generalized Reynolds number and the Weber number as parameters. Additionally a first attempt will be given to correlate both Newtonian and gelled fluids in a common regime diagram.

Characterization of Various Properties of Gel Fuels with Regard to Propulsion Application

Propulsion systems with gelled propellants combine the ability of thrust magnitude variation on demand with simple handling and storage capabilities. The present publication gives an overview about various properties of gelled propellants, which have been investigated in basic experimental setups and/or analytically. It includes rheological properties of selected gelled fuels with regard to shear strain, their flow behavior in tubes, their spray characteristics with regard to impinging jet injectors and combustion characteristics with a single injector in a pressurized chamber.

Atomization Behavior of Newtonian Fluids with an Impinging Jet Injector in Dependence upon Reynolds and Weber Numbers

The atomization behavior of Newtonian fluids and non-Newtonian gelled fluids, which show a shear-thinning behavior, with a doublet like-on-like impinging jet injector has been investigated with the shadowgraph technique. The spray behavior of both distinct Newtonian fluids and non-Newtonian gels will be presented and compared. The experiments with Newtonian fluids of different Ohnesorge numbers have been conducted in a wide range of Reynolds and Weber numbers (60 ≤ Re ≤ 30,000 and 100 ≤ We ≤ 30,000). The different observed breakup modes are presented in a Regime diagram with Reynolds and Weber numbers as parameters. The present publication gives an overview about the actual state of the investigations and a first attempt will be presented to correlate both Newtonian and gelled fluids in one Regime diagram.