Rudibert King - Active Flow and Combustion Control 2021: Papers Contributed to the Conference “Active Flow and Combustion Control 2021”, September 28–29, 2021, ... Mechanics and Multidisciplinary Design, 152)

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The efficient conversion of energy to serve societal needs for mobility and improved lifestyle enjoys continuous attention since decades and especially in recent years by initiatives like Fridays for Future and others. However, striving for more efficiency poses challenges for conventional energy conversion systems such as gas turbines. Thermodynamically, conventional configurations are limited in terms of further efficiency improvements by maximum temperature allowances to avoid unwanted emissions and ensure sufficient lifetime.

Since many years, energy research in Berlin has focused on the improvement of both the efficiency and effectivity of technical systems. Active flow control (AFC) demonstrated a strong potential to save costs for land, sea, and air vehicles already by reducing drag and increasing lift. The successful collaborative research center CRC 557 Control of turbulent shear flows at Technische Universitt Berlin, funded by the Deutsche Forschungsgemeinschaft (DFG), led to a strong recognition of this approach and resulted in a series of conferences, where the findings were discussed with experts in the field. In parallel, pressure gaining combustion (PGC) promised a significant chance to increase thermal efficiency of gas turbines. However, these approaches of more efficient thermodynamic cycles introduce the challenge of unavoidable unsteadiness for adjacent components. In order to increase the operability range of combustors, compressors, and turbines, the effect of highly dynamic processes has thus moved into the focus of research activities.

In order to wide up the view onto the potential of PGC, the CRC 1029 substantial efficiency increase in gas turbines through direct use of coupled unsteady combustion and flow dynamics was proposed, which was granted by DFG in 2012 for a first 4-year period and continued for a second funding period in 2016. The objective is to achieve a higher thermodynamic efficiency of gas turbines, while keeping the additional control and aerodynamic challenges within bounds. Multidisciplinarity has been proven to be required definitely, which is expressed in this volume by the combined authorships from various disciplines. Thermodynamic understanding of energy conversion together with experimental and numerical fluid mechanics needs to be combined with mathematics and control theory in order to create the overall picture. The reduction in amplitude of pressure waves traveling within the system was achieved by the introduction of concepts like the shockless explosion combustion (SEC). Included in this volume are as well results for rotating detonation combustion (RDC), which in this context appears to be a promising concept for the future as well.

A series of successful conferences was set up in the past to convey the results of this detailed research, bringing together recognized experts in these various fields. Starting in 2006 and 2010 with Active Flow Control I and II, an interdisciplinary discussion was initiated in the community. This approach was followed later by adding the specific challenges of controlling unsteady combustion in the conferences Active Flow and Combustion Control in 2014 and 2018. The present volume contains most of the presentations given at Active Flow and Combustion Control 2021. The successful format of the preceding conferences was unchanged with invited lectures and single-track sessions only. Not all presenters could prepare a manuscript for this volume, but it still presents a well-balanced combination of theoretical, numerical, and experimental state-of-the-art results of active flow and combustion control.