TY - JOUR AU - Kovács, Kinga Andrea AU - Balla, Esztella Éva TI - Parameter Identification of the Lagrangian-averaged Vorticity Deviation Vortex Detection Method Through the Investigation of Fluid Flow Around Solid Bodies JF - PERIODICA POLYTECHNICA-MECHANICAL ENGINEERING J2 - PERIOD POLYTECH MECH ENG VL - 67 PY - 2023 IS - 4 SP - 293 EP - 302 PG - 10 SN - 0324-6051 DO - 10.3311/PPme.22874 UR - https://m2.mtmt.hu/api/publication/34234013 ID - 34234013 N1 - Funding Agency and Grant Number: Ministry of Innovation and Technology of Hungary from the National Research, Development and Innovation Fund [143204]; Ministry of Culture and Innovation of Hungary from the National Research, Development and Innovation Fund [TKP-6-6/PALY-2021] Funding text: Project no. 143204 has been implemented with the support provided by the Ministry of Innovation and Technology of Hungary from the National Research, Development and Innovation Fund, financed under the OTKA K 22 funding scheme. 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 main focus of the current paper is the detection of vortices in fluid flow around a circular cylinder and a square cylinder, with an emphasis on the identification of the parameters used for vortex detection. The authors aim to enhance the practicality of an existing vortex detection method (Lagrangian-averaged vorticity deviation) by providing recommendations for the settings of the vortex detection parameters. The simulations were carried out using ANSYS Workbench 2022 R2, encompassing Reynolds numbers between 12 and 140, and angles of incidence from 0(degrees) to 45(degrees). The vortex detection was performed using MATLAB R2020b. The paper provides a comprehensive description of the parameters involved in the detection process and their significance, as well as the implementation of the parameter identification. The study results in the determination of the suggested parameter ranges, and a comparative analysis of different vortex detection methods is also presented for the case of the circular cylinder. 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 - CONF AU - Kovács, Kinga Andrea AU - Balla, Esztella Éva ED - Barabás, István TI - Örvénydetektálás henger körüli áramlásban T2 - OGÉT 2023 PB - Erdélyi Magyar Műszaki Tudományos Társaság Gépészeti Szakosztály C1 - Kolozsvár T3 - Nemzetközi Gépészeti Találkozó (OGÉT), ISSN 2068-1267 ; 31. PY - 2023 SP - 306 EP - 311 PG - 6 UR - https://m2.mtmt.hu/api/publication/33814745 ID - 33814745 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Lendvai, Bálint AU - Benedek, Tamás AU - Balla, Esztella Éva TI - Aeroacoustic investigation of airfoil profiles in turbulence at moderate Reynolds numbers involving the phased array microphone technique and the ANOVA statistical method JF - FLUCTUATION AND NOISE LETTERS J2 - FLUCT NOISE LETT VL - 22 PY - 2023 IS - 3 PG - 13 SN - 0219-4775 DO - 10.1142/S0219477523500323 UR - https://m2.mtmt.hu/api/publication/33687613 ID - 33687613 N1 - Funding Agency and Grant Number: Ministry of Innovation and Technology of Hungary from National Research, Development, and Innovation Fund [BME-NVA-02, TKP2021]; Hungarian National Research, Development, and Innovation Centre [K 129023]; National Talent Programme of the Ministry of Human Capacities, Hungary [NFTO-21-B-0279] 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 Fund, financed under the TKP2021 funding scheme. The research has also been funded by the Hungarian National Research, Development, and Innovation Centre under contract No. K 129023, and the National Talent Programme of the Ministry of Human Capacities, Hungary (NFTO-21-B-0279). 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 - JOUR AU - Balla, Esztella Éva AU - Vad, János TI - Models for Estimation of Lift and Drag Coefficients for Low-Reynolds-Number Cambered Plates JF - AIAA JOURNAL J2 - AIAA J VL - 60 PY - 2022 IS - 12 SP - 6620 EP - 6632 PG - 13 SN - 0001-1452 DO - 10.2514/1.J061579 UR - https://m2.mtmt.hu/api/publication/33092669 ID - 33092669 N1 - Funding Agency and Grant Number: National Research, Development and Innovation (NRDI) Fund; Ministry for Innovation and Technology; Ministry for Innovation and Technology of Hungary from the NRDI Fund [K 129023]; Hungarian NRDI Centre [NFTO-20-B-0232]; National Talent Programme of the Ministry of Human Capacities, Hungary; [BME-NVA-02] Funding text: The research reported in this paper and carried out at BME has been supported by the National Research, Development and Innovation (NRDI) Fund (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 research reported in this paper is part of project no. BME-NVA-02, implemented with the support provided by the Ministry for Innovation and Technology of Hungary from the NRDI Fund, financed under the TKP2021 funding scheme. The research has also been funded by the Hungarian NRDI Centre, under contract no. K 129023, and the National Talent Programme of the Ministry of Human Capacities, Hungary (NFTO-20-B-0232). Gratitude is expressed to Gabor Halasz for his advice on the statistical evaluation of the measurement results. AB - Empirical models capable of predicting the lift and drag coefficients of circular-arc cambered plate blades are presented, together with the detailed documentation of the related wind-tunnel technique and data evaluation. The blade profiles are equipped with rounded leading and trailing edges. The empirical models offer an easy-to-use tool for preliminary design of low-solidity low-speed blade cascades. By means of the models, the lift-coefficient range of 0-1.3 is covered, associated with the drag coefficient varying between 0.02 and 0.14. The validity ranges of the empirical models are as follows: Reynolds-number between 4x104 and 1.4x105, relative camber ranging from 0 to 8%, and angle of attack between 0 and 8 deg. The force coefficients are expressed as a function of relative camber, angle of attack, and Reynolds-number. The models assume linear relationships between the Reynolds-number and the force coefficients, as inspired by the literature and justified by statistical means. The dependence of the force coefficients on the angle of attack and the relative camber is expressed by incorporating second-order polynomials. The trends of force changes with Reynolds-number are analyzed. The cases of apparently extraordinary trends in the Reynolds-number dependence (i.e., increasing drag and decreasing lift with increasing Reynolds-number) are discussed in detail. A method for the determination of the confidence intervals related to the models is presented, and a detailed uncertainty analysis is provided. On this basis, the relative errors of the force coefficients can be quantified in a case-specific, empirical manner. LA - English DB - MTMT ER - TY - CONF AU - Balla, Esztella Éva AU - Vad, János TI - Refinement of a semi-empirical method for the estimation of profile vortex shedding frequency from low-speed axial fan blade sections 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 - 12 DO - 10.29008/ETC2021-591 UR - https://m2.mtmt.hu/api/publication/32191653 ID - 32191653 LA - English DB - MTMT ER - TY - JOUR AU - Balla, Esztella Éva AU - Vad, János TI - An empirical model to determine lift and drag coefficients of cambered plates at moderate Reynolds numbers JF - PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY J2 - P I MECH ENG A-J POW VL - 235 PY - 2021 IS - 2 SP - 202 EP - 210 PG - 9 SN - 0957-6509 DO - 10.1177/0957650920915317 UR - https://m2.mtmt.hu/api/publication/31327590 ID - 31327590 N1 - Funding Agency and Grant Number: Hungarian National Research, Development and Innovation Centre [K 129023]; Higher Education Excellence Program of the Ministry of Human Capacities; National Research, Development and Innovation Fund [TUDFO/51757/2019-ITM] 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 Centre under contract No. K 129023. The research reported in this article was supported by the Higher Education Excellence Program of the Ministry of Human Capacities in the frame of Water science & Disaster Prevention research area of Budapest University of Technology and Economics (BME FIKP-VI ' Z) and by the National Research, Development and Innovation Fund (TUDFO/51757/2019-ITM, Thematic Excellence Program). LA - English DB - MTMT ER - TY - THES AU - Balla, Esztella Éva TI - Aerodynamic and aeroacoustic behavior of axial fan blade sections at low Reynolds numbers PY - 2020 SP - 91 UR - https://m2.mtmt.hu/api/publication/31799366 ID - 31799366 LA - English DB - MTMT ER - TY - CONF AU - Balla, Esztella Éva AU - Vad, János TI - A Laplacian filtering-based technique to localize vortex shedding noise in a strongly contaminated environment T2 - 8th Berlin Beamforming Conference (BeBeC) PY - 2020 PG - 19 UR - https://m2.mtmt.hu/api/publication/31393329 ID - 31393329 LA - English DB - MTMT ER -