Institut für Strömungsmechanik und Technische Akustik (ISTA)
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92 Submissions in this community.

Recent Submissions
Numerische Simulation des Breitbandlärms in Turbomaschinen mittels Improved Delayed Detached Eddy Simulation

Greschner, Björn (2016)

Bei der Entwicklung moderner Triebwerke steht neben aerodynamischen und wirtschaftlichen Aspekten in zunehmendem Maße die Reduktion der Lärmemissionen im Vordergrund. Der Lärm eines Fan-Triebwerks ...

Application of the interface mobility concept for low-noise design

Sayer, Agnes (2016)

In previous research it was suggested that the process for low–noise design of machinery could be based on the interface mobility concept. In this thesis this proposition is investigated numericall...

Experimental investigation and analysis of the nonlinear response of turbulent swirl-stabilized flames

Schimek, Sebastian (2016)

Um eine niedrige Schadstoffemission bei der Stromerzeugung zu realisieren, wird bei den meisten Gasturbinen die magere Vormischverbrennung genutzt. Jedoch neigt diese Verbrennungstechnologie zu the...

Numerical modeling of fluid-structure interaction in bio-inspired propulsion

Engels, Thomas (2016)

Flying and swimming animals have developed efficient ways to produce the fluid flow that generates the desired forces for their locomotion. These bio-inspired problems couple fluid dynamics and sol...

A two-stage rotary blood pump design to reduce blood trauma

Thamsen, Bente Kristina (2016)

Currently used ventricular assist devices (VADs) are implantable miniature centrifugal pumps, referred to as rotary blood pumps. Survival rates with these devices increased substantially during the...

Aktive Beeinflussung der tonalen Geräuschentstehung axialer Strömungsmaschinen mittels Hinterkantenausblasens aus dem Rotor

Kausche, Philip (2016)

The present work deals with active noise control by means of trailing edge blowing (TEB) to reduce the tones of rotor stator interaction noise (RSI noise) of axial turbomaschines. A lot of active n...

A hydrodynamically optimized nano-electrospray ionization source and vacuum interface

Pauly, M.; Sroka, M.; Reiss, J.; Rinke, G.; Albarghash, A.; Vogelgesang, R.; Hahne, H.; Kuster, B.; Sesterhenn, J.; Kern, K.; Rauschenbach, S. (2014)

The coupling of atmospheric pressure ionization (API) sources like electrospray ionization (ESI) to vacuum based applications like mass spectrometry (MS) or ion beam deposition (IBD) is done by dif...

Numerical simulation and modelling of sound generated by rotating instabilities in an annular compressor cascade

Rennings, Ruben van (2016)

This work addresses the phenomenon of rotating instability (RI), which is known to occur in turbomachines of axial and radial types. In axial compressors, RI typically occurs in the vicinity of th...

Gurney flaps and micro-tabs for load control on wind turbines

Bach, Alena Berit (2016)

In the last decades, wind turbine innovation has led to significant growth in capacity and size per turbine. Consequently, the blade experiences additional local fluctuations due to local gusts, ho...

Analyse und Synthese akustischer Interaktionsmoden von Turbomaschinen

Tapken, Ulf (2016)

Die Verfahren der akustischen Modenanalyse und Modensynthese liefern wichtige Beiträge zur Entwicklung lärmarmer Designs und innovativer Maßnahmen zur Schallminderung von Turbomaschinen. Durch eine...

Beitrag zur Berechnung von Windenergierotoren unter Beachtung der Gleitzahl

Naumann, David Till Nikolas (2016)

In dieser Arbeit wird eine Radialschnitttheorie zur Auslegung von Windenergierotoren mit horizontaler Achse unter Beachtung der Gleitzahl vorgestellt und experimentell validiert. Die Validierung er...

A study of transonic shock-wave/boundary-layer interactions using conservative, skew-symmetric finite-differences

Brouwer, Jens (2016)

Shock-wave/boundary-layer interactions (SBLI) are featured in many important engineering applications. Under certain conditions the complex interaction features a low-frequency unsteadiness that is...

On the analysis of the dominant periodic and non-periodic structures in the near field of swirling jets undergoing vortex breakdown

Rukes, Lothar (2016)

The vortex breakdown phenomenon and the associated self-excited global mode of swirling jets have been thoroughly investigated in the last decades. The continued interest in this flow is driven by ...

Application of active flow control to a finite swept wing

Tewes, Philipp (2015)

The performance of a semi-span wing, based on a NACA 0012 airfoil section, equipped with a 30% simple flap and a linear array of fluidic oscillators, was investigated experimentally in regards to...

Adjoint based data assimilation in compressible flows with application to pressure determination from PIV data

Lemke, Mathias (2015)

The analysis of complex fluid mechanical phenomena is based on experimental and numerical analysis. Both approaches provide suitable data, but no complete and exactly matching picture of a flow, wh...

Modeling of mixing and fuel air ratio fluctuations in lean premixed flames

Schrödinger, Christina K. (2015-09-17)

Die Mischungsqualität von Brennstoff und Luft in Gasturbinenbrennern hat Einfluss auf wichtige Verbrennungsgrößen, wie Wärmefreisetzung, Flammenfronteigenschaften, Brenngeschwindigkeit, Emissionen ...

On the influence of steam in premixed hydrogen flames for future gas turbine applications

Krüger, Oliver (2015-08-18)

Aufgrund der limitierten Verfügbarkeit fossiler Rohstoffe, ist der Umschwung auf neue Energieträger, neben der Entwicklung effizienter Energiespeichertechniken und einer intelligenten Lastverteilun...

Wind turbine blade dynamic stall and its control

Müller-Vahl, Hanns Friedrich (2015-08-11)

Rotorblätter kommerzieller Windkraftanlagen sind intensiven Fluktuationen der Strömungsgeschwindigkeit und des Anstellwinkels ausgesetzt, die zu einer dynamischen Ablösung der Grenzschicht führen k...

Anthropogenic organic micro-pollutants and pathogens in the urban water cycle: assessment, barriers and risk communication (ASKURIS)

Jekel, Martin; Ruhl, Aki Sebastian; Meinel, Felix; Zietzschmann, Frederik; Pflugmacher Lima, Stephan; Baur, Nina; Wenzel, Melanie; Gnierß, Regina; Sperlich, Alexander; Dünnbier, Uwe; Böckelmann, Uta; Hummelt, Daniel; van Baar, Patricia; Wode, Florian; Petersohn, Dietmar; Grummt, Tamara; Eckhardt, Alexander; Schulz, Wolfgang; Heermann, Alexander; Reemtsma, Thorsten; Seiwert, Bettina; Schlittenbauer, Linda; Lesjean, Boris; Miehe, Ulf; Remy, Christian; Stapf, Michael; Mutz, Daniel (2013)

In urban areas, water often flows along a partially closed water cycle in which treated municipal wastewater is discharged into surface waters which are one source of raw waters used for drinking w...

Indirect combustion noise

Kings, Nancy (2015-06-25)

In den letzten Jahren hat der Verbrennungslärm von Triebwerken zunehmend an Bedeutung gewonnen. Dieser besteht aus direktem Lärm, der simultan zum instationären Verbrennungsprozess auftritt, und in...