TY - JOUR AU - Zipszer, Gábor AU - Darázs, Bence AU - Horváth, Ákos AU - Toma, Dávid AU - Laki, Dániel AU - Gyöngyösi, Mátyás AU - Suda, Jenő Miklós AU - Koren, Márton AU - Farkas, Balázs TI - CFD Assessment of an Ultralight Aircraft Including In-Flight Test Data Comparison JF - TECHNISCHE MECHANIK (MAGDEBURG) J2 - TECHNISCHE MECHANIK VL - 43 PY - 2023 IS - 1 SP - 189 EP - 202 PG - 14 SN - 0232-3869 DO - 10.24352/UB.OVGU-2023-055 UR - https://m2.mtmt.hu/api/publication/33698775 ID - 33698775 N1 - eCon Engineering Kft, Kondorosi út 3. 4.em, Budapest, H-1116, Hungary Department of Fluid Mechanics, Faculty of Mechanical Engineering, Budapest University of Technology and Economics (BME), Bertalan Lajos utca 4-6, Budapest, H-1111, Hungary Correspondence Address: Zipszer, G.; eCon Engineering Kft, Kondorosi út 3. 4.em, Hungary; email: gabor.zipszer@econengineering.com LA - English DB - MTMT ER - TY - CHAP AU - Zipszer, Gábor AU - Darázs, Bence AU - Horváth, Ákos AU - Toma, Dávid AU - Laki, Dániel AU - Gyöngyösi, Mátyás AU - Suda, Jenő Miklós AU - Koren, Márton AU - Farkas, Balázs ED - Vad, János TI - CFD assessment of an ultralight aircraft including in-flight test data comparison 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 - 160 EP - 167 PG - 8 UR - https://m2.mtmt.hu/api/publication/33120057 ID - 33120057 LA - English DB - MTMT ER - TY - JOUR AU - Farkas, Balázs AU - Suda, Jenő Miklós TI - Application of morphed non-linear phase oscillators for representing rolling piston compressor performance JF - PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY J2 - P I MECH ENG A-J POW VL - 234 PY - 2020 IS - 3 SP - 332 EP - 341 PG - 10 SN - 0957-6509 DO - 10.1177/0957650919863598 UR - https://m2.mtmt.hu/api/publication/30774720 ID - 30774720 AB - Rolling piston compressors are small capacity volumetric machines used mainly in household refrigerator and heat-pump units. One of the main characteristics of the compressor is the way how the pressure builds up within the cylinder. This information can be used in more complex models for further investigations, e.g. to analyse the mechanical and thermal stresses of the compressor components. Modelling methods to resemble the pressurisation process of the rolling piston compressor with non-linear oscillators is presented in this paper. The mathematical description of the non-linear oscillators can be used to produce a continuous signal resembling the pressure fluctuations within the cylinder. For the definition of the necessary functions, the main characteristics of the typical rolling piston pressurisation diagram were identified. At first the pressurisation process was approximated by using the mathematical formula of the common Van der Pol oscillator. The oscillator was modified and extended with a linear second order differential equation to improve the resemblance between the target and model functions. To achieve better agreement with the target diagrams, Morphed non-linear oscillators were established. Polynomial and constructive incremental learning method was used to achieve adequate data fitting and the results of both methods were compared. The results show acceptable conformity and proved to be adequate to provide input data for further investigations i.e. for parametric studies of the compressor design. Besides modelling rolling piston compressors, this method can be applied for other volumetric compressors with cyclic pressurization sequence. LA - English DB - MTMT ER - TY - JOUR AU - Farkas, Balázs AU - Suda, Jenő Miklós TI - Transient 3D CFD Simulation of a Stationary Vane, Oil Free, Rotary Compressor JF - PERIODICA POLYTECHNICA-MECHANICAL ENGINEERING J2 - PERIOD POLYTECH MECH ENG VL - 64 PY - 2019 IS - 4 SP - 308 EP - 318 PG - 11 SN - 0324-6051 DO - 10.3311/PPme.13890 UR - https://m2.mtmt.hu/api/publication/30774729 ID - 30774729 N1 - Received: 15 February 2019, Accepted: 04 July 2019, Published online: 23 August 2019 (https://doi.org/10.3311/PPme.13890) AB - The evaluation of a newly designed oil-free rotary compressor is presented based on transient 3D Computational Fluid Dynamics (CFD) simulations. The simulations are performed at low compression ratios and low pressure ratios and low rotational speeds. To place the results into context, the data presented in related literature was processed and summarized. The methods related to the CFD model of the newly designed compressor were developed, summarized and evaluated. The accessed CFD data are in good agreement with the results of the former rolling piston compressor related investigations. The oil free operation prevents the contamination of the working fluid from lubricant. Since the compressor is planned to work in open cycle within the sensitive environment of thermal heat sources contamination free operation has to be accomplished. However, oil-free operation also results in significantly lower performance based on the modelling results. LA - English DB - MTMT ER - TY - JOUR AU - Farkas, Balázs AU - Suda, Jenő Miklós TI - Performance analysis of a novel oil-free rotary compressor JF - PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY J2 - P I MECH ENG A-J POW VL - 232 PY - 2018 IS - 7 SP - 870 EP - 887 PG - 18 SN - 0957-6509 DO - 10.1177/0957650918757876 UR - https://m2.mtmt.hu/api/publication/3312469 ID - 3312469 AB - A novel rotating piston-type compressor is presented. The conventional rolling piston architecture was redesigned to allow oil-free operation. The spring activated vane was replaced by a directly driven swinging vane to provide constant contact to the rotating piston. The model of the compressor was implemented in the AMESim simulation platform. Experiments were conducted on prototypes and the data were evaluated based on the simulation results. Directly unobservable geometric dimensions were estimated by adjusting the mathematical model parameters to the measured thermodynamic state variables with the use of a multi-parametric genetic algorithm. The simple genetic algorithm proved fast and adequate solutions. According to the collected results, the oil-free rotating piston architecture is significantly more sensitive to the sealing clearances compared to the conventional oil lubricated rolling piston compressors. Therefore, the theoretically estimated performance can only be achieved with extremely small manufacturing tolerances, which has to be maintained during the operation. LA - English DB - MTMT ER - TY - GEN AU - Lajos, Tamás AU - Suda, Jenő Miklós TI - Az áramlástan alapjai - DVD melléklet CY - Lajos T. Az áramlástan alapjai (2015), kiadja Dr. Lajos T., ISBN 978 963 12 2885 4 PY - 2015 UR - https://m2.mtmt.hu/api/publication/2947549 ID - 2947549 LA - Hungarian DB - MTMT ER - TY - CHAP AU - Farkas, Balázs AU - Szente, Viktor AU - Suda, Jenő Miklós ED - Vad, János TI - Dynamic meshing strategies to model fluid flow in rolling piston compressors T2 - Proceedings of Conference on Modelling Fluid Flow (CMFF'15) PB - CFD.HU Áramlástechnikai Kft CY - Budapest SN - 9789633131909 PY - 2015 PG - 6 UR - https://m2.mtmt.hu/api/publication/2937082 ID - 2937082 LA - English DB - MTMT ER - TY - JOUR AU - Farkas, Balázs AU - Szente, Viktor AU - Suda, Jenő Miklós TI - A Simplified Modeling Approach for Rolling Piston Compressors. JF - PERIODICA POLYTECHNICA-MECHANICAL ENGINEERING J2 - PERIOD POLYTECH MECH ENG VL - 59 PY - 2015 IS - 2 SP - 94 EP - 101 PG - 8 SN - 0324-6051 DO - 10.3311/PPme.7936 UR - https://m2.mtmt.hu/api/publication/2886115 ID - 2886115 AB - A new type of thermodynamic machine was designed and prepared for testing to evaluate its capability in extracting mechanical energy from low enthalpy heat sources. The system was completed with a newly designed rotary piston compressor and expander to improve efficiency. A numerical model was set up using commercially available CFD code ANSYS Fluent to evaluate the performance of the compressor and to identify the fluid dynamic related loss sources. In attempt to increase computational efficiency 3D and 2D computations were compared to find the simplest model which provides sufficient information to capture the important heat transfer and fluid mechanical features. LA - English DB - MTMT ER - TY - JOUR AU - Balczó, Márton AU - Balogh, Miklós AU - Goricsán, István AU - Nagel, T AU - Suda, Jenő Miklós AU - Lajos, Tamás TI - Air quality around motorway tunnels in complex terrain - computational fluid dynamics modeling and comparison to wind tunnel data JF - IDŐJÁRÁS / QUARTERLY JOURNAL OF THE HUNGARIAN METEOROLOGICAL SERVICE J2 - IDŐJÁRÁS VL - 115 PY - 2011 IS - 3 SP - 179 EP - 204 PG - 26 SN - 0324-6329 UR - https://m2.mtmt.hu/api/publication/2668680 ID - 2668680 N1 - Funding Agency and Grant Number: National Infrastructure Development Corporation of Hungary; New Szechenyi Plan [TAMOP-4.2.1/B-09/1/KMR-2010-0002]; European Union; European Social Fund [TAMOP 4.2.1./B-09/1/KMR-2010-0003] Funding text: Thanks are due to the Hungarian Meteorological Service, to department staff members Tamas Regert, Viktor Szente, Zoltan Szucsan, Gabor Kalmar, and finally to all participating students for their valuable contributions. The investigations presented in this paper were financed by the National Infrastructure Development Corporation of Hungary. This work is connected to the scientific program of the "Development of quality-oriented and harmonized R+D+I strategy and functional model at BME" project, which is supported by the New Szechenyi Plan (grant agreement no.: TAMOP-4.2.1/B-09/1/KMR-2010-0002). Miklos Balogh's participation was also financed by his current project, which is supported by the European Union and co-financed by the European Social Fund (grant agreement no. TAMOP 4.2.1./B-09/1/KMR-2010-0003). LA - English DB - MTMT ER - TY - CONF AU - Iváncsy, Tamás AU - Kiss, István AU - Suda, Jenő Miklós AU - Berta, István TI - Some Aspects of "Long Term" Modelling of Electrostatic Precipitators T2 - XII International Conference on Electrostatic Precipitation PY - 2011 SP - 1 EP - 4 PG - 4 UR - https://m2.mtmt.hu/api/publication/2664382 ID - 2664382 LA - English DB - MTMT ER -