TY - BOOK ED - Daku, Gábor ED - Vad, János TI - Áramlástan. Előadásjegyzet dr. Vad János előadásai alapján TS - Előadásjegyzet dr. Vad János előadásai alapján PB - Akadémiai Kiadó CY - Budapest PY - 2024 SN - 9789636640163 DO - 10.1556/9789636640163 UR - https://m2.mtmt.hu/api/publication/34565635 ID - 34565635 LA - Hungarian DB - MTMT ER - TY - GEN ED - Vad, János ED - Horváth, Csaba ED - Benedek, Tamás TI - International Journal of Turbomachinery, Propulsion and Power. Selected Turbomachinery Papers from the 18th Conference on Modelling Fluid Flow CMFF'22 TS - Selected Turbomachinery Papers from the 18th Conference on Modelling Fluid Flow CMFF'22 PY - 2023 UR - https://m2.mtmt.hu/api/publication/34518816 ID - 34518816 LA - English DB - MTMT ER - TY - JOUR AU - Lukács, Eszter AU - Vad, János TI - Parameter Study of a Loss Reducing Passive Flow Control Method in a Square-to-square Sudden Expansion JF - PERIODICA POLYTECHNICA-MECHANICAL ENGINEERING J2 - PERIOD POLYTECH MECH ENG VL - 67 PY - 2023 IS - 3 SP - 204 EP - 213 PG - 10 SN - 0324-6051 DO - 10.3311/PPme.22389 UR - https://m2.mtmt.hu/api/publication/34086607 ID - 34086607 N1 - Funding Agency and Grant Number: Ministry of Culture and Innovation of Hungary from the National Research, Development and Innovation Fund [TKP-6-6/PALY-2021]; [TKP2021-NVA] Funding text: Acknowledgement Project no. TKP-6-6/PALY-2021 has been implemented with the support provided by the Ministry of Culture and Innovation of Hungary from the National Research, Development and Innovation Fund, financed under the TKP2021-NVA funding scheme. AB - The energy consumption of mechanical ventilation in buildings needs to be reduced. An efficient way to achieve this goal is to reduce the hydraulic resistance of the ventilation duct system elements, for example, that of sudden expansions. Ventilation ducts and pipe fittings are frequently of rectangular cross-section. The present paper investigates a passive flow control method in order to reduce the loss coefficient of a square-to-square sudden expansion, where the loss-reducing appendages are short guide vanes, termed as miniflaps, placed at the step edge of the sudden expansion. The turbulent flow is examined numerically using the generalized k-ω model of the Ansys Fluent software for different area ratios of the sudden expansion, miniflap lengths, and miniflap angle setups. The Reynolds number is kept constant at 1.08·105. Based on the results of the numerical simulations, the loss coefficient of the sudden expansion can be reduced by ~20–25% for an optimum miniflap angle between 9° and 12°. Increasing the length of the miniflaps leads to a greater reduction of the loss coefficient up to a miniflap length of 0.3 dh1, where dh1 is the upstream hydraulic diameter of the duct. LA - English DB - MTMT ER - TY - CONF AU - Tóth, D. AU - Divinyi-Zsoldos, T. AU - Lendvai, Bálint AU - Vad, János TI - Preliminary case studies to acoustics-based condition monitoring of industrial fans T2 - 15th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics 2023, ETC 2023 PB - European Turbomachinery Society (EUROTURBO) T3 - European Conference on Turbomachinery Fluid dynamics & Thermodynamics, ISSN 2313-0067 PY - 2023 PG - 15 DO - 10.29008/ETC2023-123 UR - https://m2.mtmt.hu/api/publication/34069787 ID - 34069787 LA - English DB - MTMT ER - TY - CONF AU - Kocsis, Bálint AU - Benedek, Tamás AU - Ferenczy, Péter AU - Balla, Esztella Éva AU - Daku, Gábor AU - Vad, János TI - Aerodynamic and acoustic studies on a radial fan family developed for increased specific flow rate of dust-laden gases T2 - 15th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics 2023, ETC 2023 PB - European Turbomachinery Society (EUROTURBO) T3 - European Conference on Turbomachinery Fluid dynamics & Thermodynamics, ISSN 2313-0067 PY - 2023 PG - 15 DO - 10.29008/ETC2023-126 UR - https://m2.mtmt.hu/api/publication/34069785 ID - 34069785 LA - English DB - MTMT ER - TY - GEN ED - Dominique, Thévenin ED - Vad, János ED - Horváth, Csaba ED - Gábor, Janiga TI - Technische Mechanik. Vol. 43 No. 1 (2023): Special Issue for CMFF’22 TS - Vol. 43 No. 1 (2023): Special Issue for CMFF’22 ET - 43 PY - 2023 SP - 1 EP - 202 PG - 202 UR - https://m2.mtmt.hu/api/publication/33645609 ID - 33645609 AB - This volume of Tech. Mech. contains selected papers presented at the 18th event of the international conference series on fluid flow technologies, referred to today as Conference on Modelling Fluid Flow (CMFF’22). This conference took place in Budapest (Hungary) between Aug. 30th and Sept. 2nd, 2022, with more than 100 participants from 14 countries. The next event is scheduled for September 2025. Please bookmark https://www.cmff.hu if you would like to be kept informed. LA - English DB - MTMT ER - TY - JOUR AU - Daku, Gábor AU - Vad, János TI - A Comprehensive Analytical Model for Vortex Shedding from Low-Speed Axial Fan Blades JF - JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME J2 - J TURBOMACH VL - 145 PY - 2023 IS - 7 PG - 11 SN - 0889-504X DO - 10.1115/1.4056700 UR - https://m2.mtmt.hu/api/publication/33639751 ID - 33639751 N1 - Funding Agency and Grant Number: Ministry of Innovation and Technology of Hungary from the National Research, Development and Innovation (NRDI) Fund [TKP2021]; NRDI Fund; NKFI [K 129023]; Gedeon Richter Talent Foundation; Gedeon Richter Plc., within the framework of the "Gedeon Richter PhD Scholarship [UNKP-21-3]; New National Excellence Program of the Ministry of Innovation and Technology from the source of the NRDI Fund Funding text: The research reported in this paper is part of project no. BME-NVA-02, implemented with the support provided by the Ministry of Innovation and Technology of Hungary from the National Research, Development and Innovation (NRDI) Fund, and financed under the TKP2021 funding scheme. This work has been supported by the NRDI Fund under contract No. NKFI K 129023. The contribution of Gabor DAKU has been supported by the Gedeon Richter Talent Foundation (registered office: 1103 Budapest, Gyomroi ut 19-21.), established by Gedeon Richter Plc., within the framework of the "Gedeon Richter PhD Scholarship." The work has been supported by the UNKP-21-3 New National Excellence Program of the Ministry of Innovation and Technology from the source of the NRDI Fund. AB - The paper presents a comprehensive analytical model for the characterization of von Karman vortex shedding in the wake of models of low-speed axial fan blades. The elaborated minimal model is based on the Reynolds-averaged Navier–Stokes and continuity equations. For validation purposes, hot-wire measurements have been carried out in a wind tunnel on representative blade profiles. The measurement data obtained for various streamwise positions downstream of the blade trailing edge, i.e., transversal profiles of mean velocity as well as root-mean-square of fluctuating velocity, are evaluated. As the experimental validation demonstrates, the minimal model fairly localizes the transversal position of the vortex centers and represents the motion of the vortices along the wake. The validated minimal model serves the following benefits: (a) an extensive understanding of the underlying physics related to the flow field featuring vortex shedding in the near-wake region (easy-to-use quantitative correlation among the characteristics of wake flow affected by the shed vortices); (b) extension of the literature-based methodology for determination of the transversal distance between the shed vortex rows, being used as a scaling parameter for the Strouhal number utilized in calculation of vortex shedding frequency; and (c) modeling the behavior of rows of shed vortices farther away from the trailing edge. Such behavior may influence the acoustic signature of VS, and, as such, it is to be considered in fan noise modeling. LA - English DB - MTMT ER - TY - CHAP AU - Tóth, Dominik AU - Vad, János ED - Vad, János TI - Industry 4.0 perspectives of axial and radial fans in smart industrial ventilation: conceptual case studies T2 - Proceedings of Conference on Modelling Fluid Flow (CMFF'22) PB - Budapest University of Technology and Economics, Department of Fluid Mechanics CY - Budapest SN - 9789634218814 PY - 2022 SP - 217 EP - 231 PG - 15 UR - https://m2.mtmt.hu/api/publication/33255159 ID - 33255159 LA - English DB - MTMT ER - TY - CHAP AU - Ferenczy, Péter AU - Balla, Esztella Éva AU - Benedek, Tamás AU - Daku, Gábor AU - Kocsis, Bálint AU - Kónya, Antal AU - Vad, János ED - Vad, János TI - Development of a radial flow fan family for contaminated gases of relatively high flow rate T2 - Proceedings of Conference on Modelling Fluid Flow (CMFF'22) PB - Budapest University of Technology and Economics, Department of Fluid Mechanics CY - Budapest SN - 9789634218814 PY - 2022 SP - 262 EP - 272 PG - 11 UR - https://m2.mtmt.hu/api/publication/33202680 ID - 33202680 LA - English DB - MTMT ER - TY - CHAP AU - Daku, Gábor AU - Vad, János TI - A Comprehensive Analytical Model for Vortex Shedding From Low-Speed Axial Fan Blades T2 - Proceedings of ASME Turbo Expo 2022 PB - American Society of Mechanical Engineers (ASME) CY - New York, New York SN - 9780791886021 PY - 2022 PG - 13 DO - 10.1115/GT2022-80190 UR - https://m2.mtmt.hu/api/publication/33201666 ID - 33201666 AB - The paper presents a comprehensive analytical model for the characterization of von Karman vortex shedding in the wake of models of low-speed axial fan blades. The elaborated minimal model is based on the Reynolds-averaged Navier-Stokes and continuity equations. For validation purposes, hot-wire measurements have been carried out in a wind tunnel on representative blade profiles. The measurement data obtained for various streamwise positions downstream of the blade trailing edge, i.e. transversal profiles of mean velocity as well as root-mean-square of fluctuating velocity, are evaluated. As the experimental validation demonstrates, the minimal model fairly localizes the transversal position of the vortex centres, and represents the motion of the vortices along the wake. The validated minimal model serves with the following benefits. a) An extensive understanding of the underlying physics related to the flow field featuring vortex shedding in the near-wake region. Easy-to-use quantitative correlation among the characteristics of wake flow affected by the shed vortices. b) Extension of the literature-based methodology for determination of the transversal distance between the shed vortex rows, being used as scaling parameter for the Strouhal number utilized in calculation of vortex shedding frequency. c) Modelling the behavior of rows of shed vortices farther away from the trailing edge. Such behavior may influence the acoustic signature of VS, and, as such, it is to be considered in fan noise modelling. LA - English DB - MTMT ER -