Klaus Hannemann
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View article: Thrust measurement of an ion thruster by a force probe approach and comparison to a thrust balance
Thrust measurement of an ion thruster by a force probe approach and comparison to a thrust balance Open
A key parameter when characterizing the performance of an electric propulsion system is obviously its thrust. The thrust can be either determined directly using a so-called thrust balance or deduced from indirect measurements. Here, we pre…
View article: Sensitivity of scale resolving aft-body flow simulations to numerical model parameter variations
Sensitivity of scale resolving aft-body flow simulations to numerical model parameter variations Open
The sensitivity of hybrid RANS-LES methods like Improved Delayed Detached Eddy Simulation (IDDES) to numerical model parameter variations related to generic space launch vehicle aft-body flows is investigated. In particular, the changes re…
View article: Sputtering of Mo and Ag with xenon ions from a radio-frequency ion thruster
Sputtering of Mo and Ag with xenon ions from a radio-frequency ion thruster Open
The goal of this work is to set up an electric propulsion (EP) sputtering test section as a feasibility study for ground-based sputter testing of spacecraft materials with a radio-frequency ion thruster. Such experiments deliver valuable d…
View article: Numerical Investigation of Space Launch Vehicle Base Flows with Hot Plumes
Numerical Investigation of Space Launch Vehicle Base Flows with Hot Plumes Open
The flow field around generic space launch vehicles with hot exhaust plumes is investigated numerically. Reynolds-Averaged Navier-Stokes (RANS) simulations are thermally coupled to a structure solver to allow determination of heat fluxes i…
View article: A kinetic Fokker–Planck approach for modeling variable hard-sphere gas mixtures
A kinetic Fokker–Planck approach for modeling variable hard-sphere gas mixtures Open
Kinetic Fokker–Planck (FP) methods for modeling rarefied gas flows have received increasing attention over the last few years. However, formulating such models for realistic multi-species gases is still an open subject of research. Therefo…
View article: Ion thrusters for electric propulsion: Scientific issues developing a niche technology into a game changer
Ion thrusters for electric propulsion: Scientific issues developing a niche technology into a game changer Open
The transition from old space to new space along with increasing commercialization has a major impact on space flight, in general, and on electric propulsion (EP) by ion thrusters, in particular. Ion thrusters are nowadays used as primary …
View article: Post-test analysis of the LAPCAT-II subscale scramjet
Post-test analysis of the LAPCAT-II subscale scramjet Open
A subscale flight experiment configuration propelled by a Mach 8 supersonic combustion ramjet (scramjet) was designed within the framework of the European Commission co-funded Long Term Advanced Propulsion Concepts and Technologies II proj…
View article: A kinetic Fokker–Planck approach to model hard-sphere gas mixtures
A kinetic Fokker–Planck approach to model hard-sphere gas mixtures Open
Since its first introduction, it has always been a subject of research to find models for a meaningful approximation of the highly accurate but complex Boltzmann equation. In the kinetic Fokker–Planck (FP) approach, a FP operator in veloci…
View article: Direct-current current transformer for the measurement of an electric propulsion ion beam
Direct-current current transformer for the measurement of an electric propulsion ion beam Open
An important task in the development of electric propulsion devices is ground-based testing. In order to characterize electric thrusters, their generated ion beams are regarded as figures of merit and have to be well-known and understood. …
View article: DLR Project TAUROS: TAU for Rocket Thrust Chamber Simulation
DLR Project TAUROS: TAU for Rocket Thrust Chamber Simulation Open
The present work gives a brief overview of the DLR (German Aerospace Center) project TAUROS (TAU for Rocket Thrust Chamber Simulation). The DLR project TAUROS is a collaboration between three different DLR institutes, and is funded by the …
View article: Combustion Modeling in Solid Rocket Motor Plumes
Combustion Modeling in Solid Rocket Motor Plumes Open
The thermo-chemistry of plumes emanating from solid rocket motors (SRM) is strongly influenced by hydrogen/oxygen/chlorine chemistry. These after-burning reactions have a significant impact onto the infrared signature, as well as on chemic…
View article: The High Enthalpy Shock Tunnel Göttingen of the German Aerospace Center (DLR)
The High Enthalpy Shock Tunnel Göttingen of the German Aerospace Center (DLR) Open
The High Enthalpy Shock Tunnel Göttingen (HEG) of the German Aerospace Center (DLR) is one of the major European hypersonic test facilities. It was commissioned for use in 1991 and was utilized since then extensively in a large number of n…
View article: Aerothermal Analysis of Reusable Launcher Systems during Retro-Propulsion Reentry and Landing
Aerothermal Analysis of Reusable Launcher Systems during Retro-Propulsion Reentry and Landing Open
The structural and thermal loads during first stage
\nreentry may impact significantly the structural and
\nthermal design and thus influence the payload perfor-
\nmance and launch service cost of expendable launch
\nvehicles. Many studies…
View article: Experimental investigation of rarefaction effects on aerodynamic coefficients of slender and blunt re-entry vehicles
Experimental investigation of rarefaction effects on aerodynamic coefficients of slender and blunt re-entry vehicles Open
The prediction of the flight stability and of the aerodynamic coefficients in the transition region between the rarefied and the continuum flow regime is important for the design of hypersonic vehicles. The aim of this investigation is to …
View article: Rocket Propulsion in TAU: An Overview of the DLR ProTAU Project
Rocket Propulsion in TAU: An Overview of the DLR ProTAU Project Open
The ProTAU project is an internal cooperation between several DLR institutes to advance the independent DLR expertise in modelling rocket propulsion systems and their components. The focus is on the development and validation of the DLR in…
View article: Magnetic Fields and Ion Thruster Beam Effects in DLR’s EP Test Facility
Magnetic Fields and Ion Thruster Beam Effects in DLR’s EP Test Facility Open
In-space electric propulsion is in a phase of rapid growth, and satellite contractors implement more and more electric thrusters. For on-ground testing DLR operates since the end of 2011 an electric propulsion test facility at its site in …
View article: Investigation of different modeling approaches for computational fluid dynamics simulation of high-pressure rocket combustors
Investigation of different modeling approaches for computational fluid dynamics simulation of high-pressure rocket combustors Open
The paper summarizes technical results and first highlights of the cooperation between DLR and Airbus Defence and Space (DS) within the work package “CFD Modeling of Combustion Chamber Processes” conducted in the frame of the Propulsion 20…