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 - 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 - 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 - 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 - TY - JOUR AU - Daku, Gábor AU - Vad, János TI - Preliminary Design Guidelines for Considering the Vibration and Noise of Low-Speed Axial Fans Due to Profile Vortex Shedding JF - INTERNATIONAL JOURNAL OF TURBOMACHINERY PROPULSION AND POWER J2 - INT J TURBOMACH PROP VL - 7 PY - 2022 IS - 1 SP - 2 PG - 23 SN - 2504-186X DO - 10.3390/ijtpp7010002 UR - https://m2.mtmt.hu/api/publication/32587505 ID - 32587505 N1 - Export Date: 29 April 2022 Correspondence Address: Daku, G.; Department of Fluid Mechanics, Bertalan Lajos u. 4-6, Hungary; email: daku@ara.bme.hu LA - English DB - MTMT ER - TY - CONF AU - Daku, Gábor AU - Vad, János TI - Semi-Empirical Design Guidelines for Controlling the Vibration and Noise of Low-Speed Axial Fans due to Profile Vortex Shedding T2 - Proceedings of 14th European Conference on Turbomachinery Fluid dynamics & Thermodynamics ETC14 T3 - European Conference on Turbomachinery Fluid dynamics & Thermodynamics, ISSN 2313-0067 ; 14. PY - 2021 PG - 14 UR - https://m2.mtmt.hu/api/publication/32606727 ID - 32606727 LA - English DB - MTMT ER - TY - JOUR AU - Daku, Gábor AU - Vad, János TI - Profile vortex shedding from low-speed axial fan rotor blades: a modelling overview JF - PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY J2 - P I MECH ENG A-J POW VL - 236 PY - 2021 IS - 2 SP - 349 EP - 363 PG - 15 SN - 0957-6509 DO - 10.1177/09576509211026821 UR - https://m2.mtmt.hu/api/publication/32282042 ID - 32282042 N1 - Funding Agency and Grant Number: Hungarian National Research, Development and Innovation (NRDI) Centre [NKFI K 129023]; NRDI FundNational Research, Development & Innovation Office (NRDIO) - Hungary [BME-IE-WAT, BME-NCS]; Ministry for Innovation and Technology; Gedeon Richter Talent Foundation; Gedeon Richter Plc., within the framework of the "Gedeon Richter PhD Scholarship" Funding text: The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This work has been supported by the Hungarian National Research, Development and Innovation (NRDI) Centre under contract No. NKFI K 129023. The research reported in this paper and carried out at BME has been supported by the NRDI Fund (TKP2020 IES, Grant No. BME-IE-WAT and TKP2020 NC, Grant No. BME-NCS) based on the charter of bolster issued by the NRDI Office under the auspices of the Ministry for Innovation and Technology. The contribution of Gabor DAKU has been supported by Gedeon Richter Talent Foundation (registered office: 1103 Budapest, Gyomrout 19-21.), established by Gedeon Richter Plc., within the framework of the "Gedeon Richter PhD Scholarship." AB - This paper presents an overview of the characteristics potentially influencing the profile vortex shedding (PVS) phenomenon being relevant in noise and vibration of low-speed axial fan rotor blades. Dimensional analysis has been applied to explore the essential dimensionless quantities in a systematic and comprehensive manner. On this basis, limitations have been established, and simplifying assumptions have been set up in terms of PVS investigation. Groups of dimensionless characteristics playing a role in the semi-empirical model for predicting the PVS frequency were identified. The available semi-empirical model and its unique features related to the measurement evaluation methodology and Reynolds number dependence have been outlined. The presented comprehensive analysis provides guidelines from the perspective of transferability of the literature data on PVS from steady, isolated blade profile models to low-speed axial fan rotors. It also results in the formulation of objectives of future research related to PVS. LA - English DB - MTMT ER - TY - JOUR AU - Daku, Gábor AU - Vad, János TI - Experiment-Based Preliminary Design Guidelines for Consideration of Profile Vortex Shedding From Low-Speed Axial Fan Blades JF - JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME J2 - J TURBOMACH VL - 143 PY - 2021 IS - 6 SP - 1 PG - 10 SN - 0889-504X DO - 10.1115/1.4050392 UR - https://m2.mtmt.hu/api/publication/31992408 ID - 31992408 LA - English DB - MTMT ER - TY - CHAP AU - Daku, Gábor AU - Vad, János TI - Experiment-Based Preliminary Design Guidelines for Consideration of Profile Vortex Shedding From Low-Speed Axial Fan Blades T2 - Proceedings of the ASME Turbo Expo 2020 PB - American Society of Mechanical Engineers (ASME) CY - New York, New York SN - 9780791884058 PY - 2020 SP - 1 PG - 12 DO - 10.1115/GT2020-14214 UR - https://m2.mtmt.hu/api/publication/31827513 ID - 31827513 LA - English DB - MTMT ER -