@inproceedings{ValeroBung2015, author = {Valero, Daniel and Bung, Daniel Bernhard}, title = {Hybrid investigation of air transport processes in moderately sloped stepped spillway flows}, series = {E-proceedings of the 36th IAHR World Congress 28 June - 3 July, 2015, The Hague, the Netherlands}, booktitle = {E-proceedings of the 36th IAHR World Congress 28 June - 3 July, 2015, The Hague, the Netherlands}, organization = {IAHR World Congress <36, 2015, Den Haag>}, pages = {1 -- 10}, year = {2015}, language = {en} } @inproceedings{LangohrBungCrookston2022, author = {Langohr, Philipp and Bung, Daniel Bernhard and Crookston, Brian M.}, title = {Hybrid investigation of labyrinth weirs: Discharge capacity and energy dissipation}, series = {Proceedings of the 39th IAHR World Congress}, booktitle = {Proceedings of the 39th IAHR World Congress}, editor = {Ortega-S{\´a}nchez, Miguel}, publisher = {International Association for Hydro-Environment Engineering and Research (IAHR)}, address = {Madrid}, isbn = {978-90-832612-1-8}, issn = {2521-7119 (print)}, doi = {10.3850/IAHR-39WC252171192022738}, pages = {2313 -- 2318}, year = {2022}, abstract = {The replacement of existing spillway crests or gates with labyrinth weirs is a proven techno-economical means to increase the discharge capacity when rehabilitating existing structures. However, additional information is needed regarding energy dissipation of such weirs, since due to the folded weir crest, a three-dimensional flow field is generated, yielding more complex overflow and energy dissipation processes. In this study, CFD simulations of labyrinth weirs were conducted 1) to analyze the discharge coefficients for different discharges to compare the Cd values to literature data and 2) to analyze and improve energy dissipation downstream of the structure. All tests were performed for a structure at laboratory scale with a height of approx. P = 30.5 cm, a ratio of the total crest length to the total width of 4.7, a sidewall angle of 10° and a quarter-round weir crest shape. Tested headwater ratios were 0.089 ≤ HT/P ≤ 0.817. For numerical simulations, FLOW-3D Hydro was employed, solving the RANS equations with use of finite-volume method and RNG k-ε turbulence closure. In terms of discharge capacity, results were compared to data from physical model tests performed at the Utah Water Research Laboratory (Utah State University), emphasizing higher discharge coefficients from CFD than from the physical model. For upstream heads, some discrepancy in the range of ± 1 cm between literature, CFD and physical model tests was identified with a discussion regarding differences included in the manuscript. For downstream energy dissipation, variable tailwater depths were considered to analyze the formation and sweep-out of a hydraulic jump. It was found that even for high discharges, relatively low downstream Froude numbers were obtained due to high energy dissipation involved by the three-dimensional flow between the sidewalls. The effects of some additional energy dissipation devices, e.g. baffle blocks or end sills, were also analyzed. End sills were found to be non-effective. However, baffle blocks with different locations may improve energy dissipation downstream of labyrinth weirs.}, language = {en} } @inproceedings{BungValeroHermens2018, author = {Bung, Daniel Bernhard and Valero, Daniel and Hermens, G.}, title = {Hybrid investigation on the hydraulic performance of a new trapezoidal fishway}, series = {7th IAHR International Symposium on Hydraulic Structures, ISHS 2018}, booktitle = {7th IAHR International Symposium on Hydraulic Structures, ISHS 2018}, isbn = {978-069213277-7}, doi = {10.15142/T3S06R}, pages = {184 -- 193}, year = {2018}, language = {de} } @inproceedings{PakPiegelerFeldmannetal.2006, author = {Pak, Daniel and Piegeler, D. and Feldmann, Markus and Schleser, Markus and Dilthey, Ulrich}, title = {Hybrid joints of textile reinforced concrete parts - designed for assembly}, series = {Textile reinforced concrete : proceedings of the 1. International RILEM Conference, held at the RWTH Aachen, September 6/7, 2006. (RILEM proceedings ; 50)}, booktitle = {Textile reinforced concrete : proceedings of the 1. International RILEM Conference, held at the RWTH Aachen, September 6/7, 2006. (RILEM proceedings ; 50)}, editor = {Hegger, Josef}, publisher = {RILEM Publ.}, address = {Bagneux}, organization = {International Conference on Textile Reinforced Concrete <1, 2006, Aachen>}, isbn = {2-912143-97-7}, pages = {181 -- 190}, year = {2006}, language = {en} } @inproceedings{Wollert1994, author = {Wollert, J{\"o}rg}, title = {Hybride arbeitspunktabh{\"a}ngige Beobachter zur intelligenten Modellierung und Regelung nichtlinearer Strecken}, series = {Fuzzy control : GMA-Aussprachetag ; Tagung Langen, 22. und 23. M{\"a}rz 1994. (VDI-Berichte ; 1113)}, booktitle = {Fuzzy control : GMA-Aussprachetag ; Tagung Langen, 22. und 23. M{\"a}rz 1994. (VDI-Berichte ; 1113)}, publisher = {VDI-Verl.}, address = {D{\"u}sseldorf}, organization = {VDI/VDE-Gesellschaft Meß- und Automatisierungstechnik}, isbn = {3-18-091113-1}, pages = {497 -- 506}, year = {1994}, language = {de} } @inproceedings{PlessmannWollert1993, author = {Pleßmann, K. W. and Wollert, J{\"o}rg}, title = {Hybride Beobachter zur Regelung arbeitspunktabh{\"a}ngiger Regelstrecken}, series = {Berichtsband / 3. Workshop "Fuzzy Control" des GMA-UA 1.4.2 am 11./12.11.1993 in Dortmund. (Forschungsberichte / Universit{\"a}t Dortmund, Fakult{\"a}t f{\"u}r Elektrotechnik ; 2/93)}, booktitle = {Berichtsband / 3. Workshop "Fuzzy Control" des GMA-UA 1.4.2 am 11./12.11.1993 in Dortmund. (Forschungsberichte / Universit{\"a}t Dortmund, Fakult{\"a}t f{\"u}r Elektrotechnik ; 2/93)}, publisher = {Univ., Fak. Elektrotechnik}, address = {Dortmund}, pages = {122 -- 126}, year = {1993}, language = {de} } @inproceedings{BungTullis2018, author = {Bung, Daniel Bernhard and Tullis, Blake}, title = {Hydraulic Structures - ISHS2018 in Perspective}, series = {7th IAHR International Symposium on Hydraulic Structures, Aachen, Germany, 15-18 May}, booktitle = {7th IAHR International Symposium on Hydraulic Structures, Aachen, Germany, 15-18 May}, isbn = {978-0-692-13277-7}, doi = {10.15142/T3WH2B}, pages = {9 seiten}, year = {2018}, language = {en} } @inproceedings{AhmedSchlenkhoffBung2011, author = {Ahmed, H. and Schlenkhoff, A. and Bung, Daniel Bernhard}, title = {Hydrodynamic characteristics of vertical slotted wall breakwaters}, series = {Balance and uncertainty - water in a changing world : proceedings of the 34th IAHR world congress ; 33rd Hydrology and Water Resources Symposium ; 10th Conference on Hydraulics in Water Engineering ; 26 June - 1 July 2011, Brisbane, Australia}, booktitle = {Balance and uncertainty - water in a changing world : proceedings of the 34th IAHR world congress ; 33rd Hydrology and Water Resources Symposium ; 10th Conference on Hydraulics in Water Engineering ; 26 June - 1 July 2011, Brisbane, Australia}, organization = {International Association for Hydraulic Engineering and Research}, isbn = {978-0-85825-868-6}, pages = {1179 -- 1186}, year = {2011}, language = {en} } @inproceedings{FunkeBeckmannStefanetal.2023, author = {Funke, Harald and Beckmann, Nils and Stefan, Lukas and Keinz, Jan}, title = {Hydrogen combustor integration study for a medium range aircraft engine using the dry-low NOx "Micromix" combustion principle}, series = {Proceedings of the ASME Turbo Expo 2023: Turbomachinery Technical Conference and Exposition. Volume 1: Aircraft Engine.}, booktitle = {Proceedings of the ASME Turbo Expo 2023: Turbomachinery Technical Conference and Exposition. Volume 1: Aircraft Engine.}, publisher = {ASME}, address = {New York}, isbn = {978-0-7918-8693-9}, doi = {10.1115/GT2023-102370}, pages = {12 Seiten}, year = {2023}, abstract = {The feasibility study presents results of a hydrogen combustor integration for a Medium-Range aircraft engine using the Dry-Low-NOₓ Micromix combustion principle. Based on a simplified Airbus A320-type flight mission, a thermodynamic performance model of a kerosene and a hydrogen-powered V2530-A5 engine is used to derive the thermodynamic combustor boundary conditions. A new combustor design using the Dry-Low NOx Micromix principle is investigated by slice model CFD simulations of a single Micromix injector for design and off-design operation of the engine. Combustion characteristics show typical Micromix flame shapes and good combustion efficiencies for all flight mission operating points. Nitric oxide emissions are significant below ICAO CAEP/8 limits. For comparison of the Emission Index (EI) for NOₓ emissions between kerosene and hydrogen operation, an energy (kerosene) equivalent Emission Index is used. A full 15° sector model CFD simulation of the combustion chamber with multiple Micromix injectors including inflow homogenization and dilution and cooling air flows investigates the combustor integration effects, resulting NOₓ emission and radial temperature distributions at the combustor outlet. The results show that the integration of a Micromix hydrogen combustor in actual aircraft engines is feasible and offers, besides CO₂ free combustion, a significant reduction of NOₓ emissions compared to kerosene operation.}, language = {en} } @inproceedings{ThenentDahmann2011, author = {Thenent, N. E. and Dahmann, Peter}, title = {Hydrostatic propeller drive}, series = {Proceedings of the conference : 18 - 20 May, 2011 Tampere, Finland / the Twelth Scandinavian International Conference on Fluid Power, SICFP'11. Ed.: Harri Sairiala ... Vol. 1}, booktitle = {Proceedings of the conference : 18 - 20 May, 2011 Tampere, Finland / the Twelth Scandinavian International Conference on Fluid Power, SICFP'11. Ed.: Harri Sairiala ... Vol. 1}, address = {Tampere}, isbn = {978-952-15-2517-9}, pages = {217 -- 227}, year = {2011}, language = {en} }