TY - JOUR AU - Füzesi, Dániel AU - Józsa, Viktor TI - The importance of unsteady phenomena of ammonia/methane combustion in an experimental swirl burner: Comparison of steady-state and transient simulation results JF - COMBUSTION AND FLAME J2 - COMBUST FLAME VL - 260 PY - 2024 PG - 10 SN - 0010-2180 DO - 10.1016/j.combustflame.2023.113207 UR - https://m2.mtmt.hu/api/publication/34433494 ID - 34433494 N1 - Export Date: 2 January 2024 CODEN: CBFMA Correspondence Address: Füzesi, D.; Department of Energy Engineering, Műegyetem rkp. 3., Budapest, Hungary; email: fuzesi.daniel@gpk.bme.hu Chemicals/CAS: ammonia, 14798-03-9, 51847-23-5, 7664-41-7; carbon monoxide, 630-08-0; hydroxide, 14280-30-9; methane, 74-82-8; nitrogen dioxide, 10102-44-0; nitrogen oxide, 11104-93-1 Funding details: European Commission, EC Funding details: Magyar Tudományos Akadémia, MTA, RRF-2.3.1-21-2022-00009 Funding details: Nemzeti Kutatási Fejlesztési és Innovációs Hivatal, NKFI, BME-NVA-02, ÚNKP-22-3-II-BME-100, ÚNKP-22-5-BME-304 Funding details: Nemzeti Kutatási, Fejlesztési és Innovaciós Alap, NKFIA Funding text 1: Daniel Fuzesi reports financial support was provided by Ministry for Culture and Innovation of Hungary and Recovery and Resilience Facility of the European Union.Viktor Jozsa reports financial support was provided by Ministry for Culture and Innovation of Hungary, Recovery and Resilience Facility of the European Union, and Hungarian Academy of Sciences.The research reported in this paper was supported by the National Research, Development and Innovation Fund of Hungary, project №. OTKA-FK 137758, and TKP2021 Grant №. BME-NVA-02, ÚNKP-22-5-BME-304, and ÚNKP-22-3-II-BME-100 New National Excellence Program by the Ministry for Culture and Innovation of Hungary from the National Research, Development and Innovation Fund, and the János Bolyai Research Scholarship of the Hungarian Academy of Sciences. Project no. RRF-2.3.1-21-2022-00009, titled National Laboratory for Renewable Energy has been implemented with the support provided by the Recovery and Resilience Facility of the European Union within the framework of Program Széchenyi Plan Plus. Funding text 2: The research reported in this paper was supported by the National Research, Development and Innovation Fund of Hungary , project №. OTKA-FK 137758 , and TKP2021 Grant №. BME-NVA-02 , ÚNKP-22-5-BME-304 , and ÚNKP-22-3-II-BME-100 New National Excellence Program by the Ministry for Culture and Innovation of Hungary from the National Research, Development and Innovation Fund , and the János Bolyai Research Scholarship of the Hungarian Academy of Sciences . Project no. RRF-2.3.1-21-2022-00009 , titled National Laboratory for Renewable Energy has been implemented with the support provided by the Recovery and Resilience Facility of the European Union within the framework of Program Széchenyi Plan Plus . LA - English DB - MTMT ER - TY - JOUR AU - Füzesi, Dániel AU - Józsa, Viktor AU - Csemány, Dávid TI - Numerical investigation on the effect of hydrogen share in NH3/H2 blends in a turbulent lean-premixed swirl burner JF - INTERNATIONAL JOURNAL OF HYDROGEN ENERGY J2 - INT J HYDROGEN ENERG VL - 49 PY - 2024 IS - Part B SP - 816 EP - 827 PG - 12 SN - 0360-3199 DO - 10.1016/j.ijhydene.2023.09.091 UR - https://m2.mtmt.hu/api/publication/34193673 ID - 34193673 LA - English DB - MTMT ER - TY - JOUR AU - Jedelský, Jan AU - Malý, Milan AU - Vankeswaram, Sai Krishna AU - Zaremba, Matouš AU - Kardos, Réka AU - Csemány, Dávid AU - Červenec, Adam AU - Józsa, Viktor TI - Effects of secondary breakup, collision dynamics, gravity and evaporation on droplet size distribution in a pressure-swirl JET A-1 spray JF - FUEL J2 - FUEL VL - 359 PY - 2024 PG - 21 SN - 0016-2361 DO - 10.1016/j.fuel.2023.130103 UR - https://m2.mtmt.hu/api/publication/34450307 ID - 34450307 N1 - Funding Agency and Grant Number: Czech Science Foundation [GA 22- 17806S, BO/00119/22/6]; National Research, Development and Innovation Fund of Hungary [OTKA-FK 137758]; Janos Bolyai Research Scholarship of the Hungarian Academy of Sciences [BO/00119/22/6] Funding text: The authors acknowledge financial support from project No. GA 22- 17806S funded by Czech Science Foundation. The support of the Hungarian researchers acknowledge the National Research, Development and Innovation Fund of Hungary, project No. OTKA-FK 137758 and the Janos Bolyai Research Scholarship of the Hungarian Academy of Sciences, No. BO/00119/22/6. Jan Jedelsky thanks to students participating on the topic within Unigo Scholarship Program: Leonardo Nascimento Parmigiani (University of Campinas, Brasil); Joao Pedro de Toni de Almeida (Universidade Federal de Santa Catarina, Florianopolis, Brasil), Ronant de Paula Monteiro (Sao Jose dos Campos College of Technology, Sao Paulo, Brasil), and Felipe Fideles de Camara (Sao Carlos School of Engineering, University of Sao Paulo, Brasil) . AB - Size and velocity of droplets in pressure-swirl sprays vary with distance downstream the nozzle. This study aims to explain the phenomena contributing to size-resolved spatial variation of the drop size distribution for Jet A-1 spray from a small pressure swirl atomizer injected into quiescent ambient air at atmospheric conditions. The effects of secondary breakup, droplet collisions, gravity, drag-driven spray dispersion, and evaporation are evaluated. Phase Doppler anemometer (PDA) was used to resolve the velocity and size of the droplets in radial profiles at several axial distances (Z) from the nozzle exit at injection pressures between 0.5 and 1.5 MPa. The droplet motion and collision dynamics were qualitatively characterised by high-speed imaging. The analysis focused on areas along 1) the spray axis and 2) the liquid sheet direction. The first area covers small droplets with marginal evolution, while the mean drop size in the second area significantly increases downstream. The local drop size distribution and its axial evolution results from a combined effect of ballistic filtering (drifting of small droplets from periphery to spray centre and large droplets vice versa), centrifugal and turbulent droplet dispersion, and droplet collisions (increasing drop size with distance). The relative droplet-gas velocity was found at investigated Z positions too small for drag-driven secondary droplet breakup to occur. Evaporation of Jet A-1 sprayed at room temperature and pressure into still atmosphere reduces the drop size marginally. Trajectory of all drop sizes is insignificantly altered by gravity. The smallest droplets are strongly drag-driven to the spray axis, while large ones disperse centrifugally and have sufficient momentum to neglect the gravity. Combining results from imaging and laser diagnostics, various collision outcomes were identified, with a conclusion that these depend on the size and velocity of colliding droplets. Coalescing collisions dominate and strongly increase the mean drop size downstream the spray at off-axis positions while insignificantly contribute along the spray axis. The drop size span factor reduces with Z as separative collisions between large droplets and mixed-type collisions between small and large droplets narrow the drop size distribution. The above effects can be most easily amplified for drop size reduction via modification of physical properties of sprayed liquid by its heating. LA - English DB - MTMT ER - TY - JOUR AU - Kardos, Réka AU - Rácz, Erika AU - Malý, M. AU - Jedelský, J. AU - Józsa, Viktor TI - Detailed spray analysis of airblast atomization of various fuels in a reacting environment JF - INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER J2 - INT J HEAT MASS TRANS VL - 227 PY - 2024 PG - 12 SN - 0017-9310 DO - 10.1016/j.ijheatmasstransfer.2024.125548 UR - https://m2.mtmt.hu/api/publication/34822026 ID - 34822026 N1 - Department of Energy Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Műegyetem rkp. 3., Budapest, H-1111, Hungary Faculty of Mechanical Engineering, Brno University of Technology, Technicka 2896/2, Brno, 616 69, Czech Republic Export Date: 26 April 2024 CODEN: IJHMA Correspondence Address: Kardos, R.A.; Department of Energy Engineering, Műegyetem rkp. 3., Hungary; email: kardos.reka9@gmail.com AB - Understanding spray evolution in a reacting environment is critical to designing advanced, clean combustion systems. The processes in the upstream region determine flame shape, stability, ignition characteristics, pollutant emission, and combustion efficiency. The developed spray is never achieved in combustion since the early regions feature primary and secondary atomization, while droplets evaporate as they approach the flame. Consequently, there is no thermodynamic equilibrium before the flame front. The principal goal of this paper is to provide detailed information to model developers on various sprays measured by a Phase Doppler Anemometer; the processed measurement data is available as supplementary material, while the raw data will be provided upon request. Four different fuels were tested: diesel fuel, aviation kerosene type JP-8, biodiesel, and a 50 % biodiesel-diesel blend by volume. The plain-jet airblast atomizer was tested at four atomization gauge pressures (0.3, 0.45, 0.6, 0.75 barg). Therefore, sixteen different sprays were measured along one spray diameter at each of four downstream distances of 15, 25, 35, and 45 mm, measured from the nozzle tip. The paper details the droplet size distribution, droplet axial velocity, fluctuations, and correlation between size and velocity to facilitate a comprehensive understanding of liquid fuel sprays. This latter measure helps identify the overshooting phenomenon, i.e., localizing the regions where the large droplets move faster than the gas phase. © 2024 The Author(s) LA - English DB - MTMT ER - TY - CONF AU - Csemány, Dávid AU - Hirják, Árpád Botond AU - Nagy, Attila AU - Guba, Attila AU - Józsa, Viktor TI - PIV measurement of distributed combustion without air dilution T2 - Proceedings of the 11th European Combustion Meeting PY - 2023 SP - 75 EP - 80 PG - 6 UR - https://m2.mtmt.hu/api/publication/34029466 ID - 34029466 LA - English DB - MTMT ER - TY - CONF AU - Füzesi, Dániel AU - Trindade, Marcelo AU - Csemány, Dávid AU - Nagy, Attila AU - Guba, Attila AU - Józsa, Viktor TI - Numerical simulation of NH3/H2 blends in an experimental swirl burner T2 - Proceedings of the 11th European Combustion Meeting PY - 2023 SP - 2431 EP - 2436 PG - 6 UR - https://m2.mtmt.hu/api/publication/34029567 ID - 34029567 LA - English DB - MTMT ER - TY - JOUR AU - Füzesi, Dániel AU - Wang, Siqi AU - Józsa, Viktor AU - Chong, Cheng Tung TI - Ammonia-methane combustion in a swirl burner: Experimental analysis and numerical modeling with Flamelet Generated Manifold model JF - FUEL J2 - FUEL VL - 341 PY - 2023 PG - 12 SN - 0016-2361 DO - 10.1016/j.fuel.2023.127403 UR - https://m2.mtmt.hu/api/publication/33661861 ID - 33661861 LA - English DB - MTMT ER - TY - JOUR AU - Józsa, Viktor AU - Lezsovits, Ferenc AU - Cséfalvay, Edit AU - Kovács, Viktória Barbara AU - Könczöl, Sándor AU - Bereczky, Ákos AU - Laza, Tamás AU - Penninger, Antal TI - Alkalmazott tüzeléstechnikai kutatások az Energetikai Gépek és Rendszerek Tanszéken JF - ENERGIAGAZDÁLKODÁS J2 - ENERGIAGAZDÁLKODÁS VL - 64 PY - 2023 IS - különszám SP - 3 EP - 11 PG - 9 SN - 0021-0757 UR - https://m2.mtmt.hu/api/publication/34023808 ID - 34023808 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Józsa, Viktor AU - Malý, Milan AU - Füzesi, Dániel AU - Rácz, Erika AU - Kardos, Réka AU - Jedelský, Jan TI - Schlieren analysis of non-MILD distributed combustion in a mixture temperature-controlled burner JF - ENERGY J2 - ENERGY VL - 273 PY - 2023 PG - 12 SN - 0360-5442 DO - 10.1016/j.energy.2023.127230 UR - https://m2.mtmt.hu/api/publication/33702233 ID - 33702233 N1 - Department of Energy Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Műegyetem rkp. 3., Budapest, H-1111, Hungary Faculty of Mechanical Engineering, Brno University of Technology, Technicka 2896/2, Brno, 616 69, Czech Republic CODEN: ENEYD Correspondence Address: Józsa, V.; Department of Energy Engineering, Műegyetem rkp. 3., Hungary; email: jozsa@energia.bme.hu LA - English DB - MTMT ER - TY - CONF AU - Kardos, Réka AU - Rácz, Erika AU - Csemány, Dávid AU - Maly, Milan AU - Jedelsky, Jan AU - Józsa, Viktor TI - Measurement and evaporation modeling of JP-8, diesel, and biodiesel sprays under hot conditions T2 - Proceedings of the 11th European Combustion Meeting PY - 2023 SP - 1586 EP - 1591 PG - 6 UR - https://m2.mtmt.hu/api/publication/34029532 ID - 34029532 LA - English DB - MTMT ER -