Steffen Risius
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View article: Influence of backward-facing steps on laminar-turbulent transition in two-dimensional boundary layers at subsonic Mach numbers
Influence of backward-facing steps on laminar-turbulent transition in two-dimensional boundary layers at subsonic Mach numbers Open
Backward-facing steps (BFS) can have a detrimental impact on laminar flow lengths because of their strong effect on boundary layer transition. BFS with normalized step heights in the range of $$h/\delta _1 \approx$$ 0.1 to 0.6 (cor…
View article: Influence of deep gaps on laminar–turbulent transition in two-dimensional boundary layers at subsonic Mach numbers
Influence of deep gaps on laminar–turbulent transition in two-dimensional boundary layers at subsonic Mach numbers Open
Systematic experimental investigations on the influence of deep gaps on the location of laminar–turbulent transition are reported. The tests were conducted in the Cryogenic Ludwieg–Tube Göttingen, a blow-down wind tunnel with good flow qua…
View article: Step-induced transition in compressible high Reynolds number flow
Step-induced transition in compressible high Reynolds number flow Open
The effect of sharp forward-facing steps on boundary-layer transition is systematically investigated in this work in combination with the influence of variations in Mach number, Reynolds number and streamwise pressure gradient. Experiments…
View article: Turbulence-induced cloud voids: observation and interpretation
Turbulence-induced cloud voids: observation and interpretation Open
The phenomenon of “cloud voids”, i.e., elongated volumes inside a cloud that are devoid of droplets, was observed with laser sheet photography in clouds at a mountain-top station. Two experimental cases, similar in turbulence conditions ye…
View article: Turbulence Induced Cloud Voids: Observation and Interpretation
Turbulence Induced Cloud Voids: Observation and Interpretation Open
The phenomenon of cloud voids, i.e., elongated volumes inside a cloud that are devoid of droplets, was observed with laser sheet photography in clouds at a mountain-top station. Two experimental cases, similar in turbulence conditions yet …
View article: Unit Reynolds number, Mach number and pressure gradient effects on laminar–turbulent transition in two-dimensional boundary layers
Unit Reynolds number, Mach number and pressure gradient effects on laminar–turbulent transition in two-dimensional boundary layers Open
The influence of unit Reynolds number (Re1=17.5E6/m to 80E6/m), Mach number (M=0.35-0.77) and incompressible shape factor (H12=2.50-2.66) on laminar-turbulent boundary layer transition was systematically investigated in the Cryogenic Ludwi…
View article: Development of a time-resolved quantitative surface-temperature measurement technique and its application in short-duration wind tunnel testing
Development of a time-resolved quantitative surface-temperature measurement technique and its application in short-duration wind tunnel testing Open
In this cumulative thesis, a time-resolved quantitative temperature-sensitive paint (TSP) measurement technique was developed and used to measure temperatures at subsonic and up to hypersonic flow velocities in two different short duration…
View article: High Speed Wind Tunnel Test of a Laminar Configuration Bizjet (HiLamBiz) Featuring the Application of Temperature Sensitive Paint (TSP)
High Speed Wind Tunnel Test of a Laminar Configuration Bizjet (HiLamBiz) Featuring the Application of Temperature Sensitive Paint (TSP) Open
Der Einsatz der Messmethode „Temperature Sensitive Paint” (TSP) zur Untersuchung von „Natural Laminar Flow“ (NLF) an einem Geschäftsreiseflugzeug (Bizjet) wird am „European Transonic Windtunnel“ (ETW) in Köln vorgeführt.