TY  - CHAP
AU  - Davidović, Nikola
AU  - Miloš, Predrag
AU  - Kolarević, Nenad
AU  - Ivanov, Toni
AU  - Jojić, Branislav
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3675
AB  - Subsonic ramjets, due to its simplicity, nowadays could be very attractive for expendable unmanned applications. However, due to very low efficiency at low Mach numbers, practically there isn’t any important application at subsonic speed. In 50’s subsonic ramjet was used for tip jet applications. Later in 70’s there was a study of Fan Augmented Ramjet (FARJ) where a fan was in-tended to be powered by a piston engine, both in subsonic and supersonic regimes. Almost at the same time it was analyzed ejector augmented subsonic ramjet. Both of these studies did not find real application of such engines. Finally, there was an attempt for the use of an Electric Ducted Fan, used in RC models, with a combustor but exit fan pressure was almost at atmospheric pressure which results in very low efficiency. This paper presents a study of propulsion system which consists of a pitot intake, electrically powered compressor/fan, combustor and nozzle (Electrically Fan Augmented Ram Jet, EFARJ). The electric motor connection to the compressor/fan is direct, without gearbox, which implies usage of a high-speed brushless motor. Such propulsion system is compared to pure ramjet and finally it is compared to performances of small expendable turbojet. Comparison is made regarding costs, weight and thrust/consumption. The study shows that the proposed propulsion system could be competitive for expendable, low speed and short duration applications.
PB  - Springer
T2  - Lecture Notes in Networks and Systems
T1  - Study of innovative subsonic ramjet
EP  - 431
SP  - 413
VL  - 153
DO  - 10.1007/978-3-030-58362-0_24
ER  - 

@inbook{
author = "Davidović, Nikola and Miloš, Predrag and Kolarević, Nenad and Ivanov, Toni and Jojić, Branislav",
year = "2021",
abstract = "Subsonic ramjets, due to its simplicity, nowadays could be very attractive for expendable unmanned applications. However, due to very low efficiency at low Mach numbers, practically there isn’t any important application at subsonic speed. In 50’s subsonic ramjet was used for tip jet applications. Later in 70’s there was a study of Fan Augmented Ramjet (FARJ) where a fan was in-tended to be powered by a piston engine, both in subsonic and supersonic regimes. Almost at the same time it was analyzed ejector augmented subsonic ramjet. Both of these studies did not find real application of such engines. Finally, there was an attempt for the use of an Electric Ducted Fan, used in RC models, with a combustor but exit fan pressure was almost at atmospheric pressure which results in very low efficiency. This paper presents a study of propulsion system which consists of a pitot intake, electrically powered compressor/fan, combustor and nozzle (Electrically Fan Augmented Ram Jet, EFARJ). The electric motor connection to the compressor/fan is direct, without gearbox, which implies usage of a high-speed brushless motor. Such propulsion system is compared to pure ramjet and finally it is compared to performances of small expendable turbojet. Comparison is made regarding costs, weight and thrust/consumption. The study shows that the proposed propulsion system could be competitive for expendable, low speed and short duration applications.",
publisher = "Springer",
journal = "Lecture Notes in Networks and Systems",
booktitle = "Study of innovative subsonic ramjet",
pages = "431-413",
volume = "153",
doi = "10.1007/978-3-030-58362-0_24"
}

Davidović, N., Miloš, P., Kolarević, N., Ivanov, T.,& Jojić, B.. (2021). Study of innovative subsonic ramjet. in Lecture Notes in Networks and Systems
Springer., 153, 413-431.
https://doi.org/10.1007/978-3-030-58362-0_24

Davidović N, Miloš P, Kolarević N, Ivanov T, Jojić B. Study of innovative subsonic ramjet. in Lecture Notes in Networks and Systems. 2021;153:413-431.
doi:10.1007/978-3-030-58362-0_24 .

Davidović, Nikola, Miloš, Predrag, Kolarević, Nenad, Ivanov, Toni, Jojić, Branislav, "Study of innovative subsonic ramjet" in Lecture Notes in Networks and Systems, 153 (2021):413-431,
https://doi.org/10.1007/978-3-030-58362-0_24 . .

TY  - JOUR
AU  - Miloš, Predrag
AU  - Davidović, Nikola
AU  - Jojić, Branislav
AU  - Miloš, Marko
AU  - Todić, Ivana
PY  - 2015
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2228
AB  - This study proposes an innovative test stand design to accurately measure rocket motor thrust vector during its operation. Test stand design is clearly presented as well as procedure and mathematical model for its calibration. A method of processing data obtained from the experiments and the results of the jet tab system for thrust vector control are presented in detail. Experiments have shown that the test stand is highly functional and the results obtained have excellent repeatability and matching with the results of the other authors who have used different construction test stands for measurement of the same or a similar mechanism for thrust vector control.
PB  - Univ Osijek, Tech Fac, Slavonski Brod
T2  - Tehnički vjesnik
T1  - A novel 6 dof thrust vector control test stand
EP  - 1254
IS  - 5
SP  - 1247
VL  - 22
DO  - 10.17559/TV-20140621064603
ER  - 

@article{
author = "Miloš, Predrag and Davidović, Nikola and Jojić, Branislav and Miloš, Marko and Todić, Ivana",
year = "2015",
abstract = "This study proposes an innovative test stand design to accurately measure rocket motor thrust vector during its operation. Test stand design is clearly presented as well as procedure and mathematical model for its calibration. A method of processing data obtained from the experiments and the results of the jet tab system for thrust vector control are presented in detail. Experiments have shown that the test stand is highly functional and the results obtained have excellent repeatability and matching with the results of the other authors who have used different construction test stands for measurement of the same or a similar mechanism for thrust vector control.",
publisher = "Univ Osijek, Tech Fac, Slavonski Brod",
journal = "Tehnički vjesnik",
title = "A novel 6 dof thrust vector control test stand",
pages = "1254-1247",
number = "5",
volume = "22",
doi = "10.17559/TV-20140621064603"
}

Miloš, P., Davidović, N., Jojić, B., Miloš, M.,& Todić, I.. (2015). A novel 6 dof thrust vector control test stand. in Tehnički vjesnik
Univ Osijek, Tech Fac, Slavonski Brod., 22(5), 1247-1254.
https://doi.org/10.17559/TV-20140621064603

Miloš P, Davidović N, Jojić B, Miloš M, Todić I. A novel 6 dof thrust vector control test stand. in Tehnički vjesnik. 2015;22(5):1247-1254.
doi:10.17559/TV-20140621064603 .

Miloš, Predrag, Davidović, Nikola, Jojić, Branislav, Miloš, Marko, Todić, Ivana, "A novel 6 dof thrust vector control test stand" in Tehnički vjesnik, 22, no. 5 (2015):1247-1254,
https://doi.org/10.17559/TV-20140621064603 . .

TY  - JOUR
AU  - Davidović, Nikola
AU  - Miloš, Predrag
AU  - Jojić, Branislav
AU  - Miloš, Marko
PY  - 2015
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2257
AB  - Physical model of spoiler and dome deflector thrust vector control (TVC) system was established considering previous and current research observations. According to logic of physical model an engineering mathematical model is derived. Model algorithm and results were analysed and explained. Finally, model data were confirmed with real motor tests.
PB  - Univ Osijek, Tech Fac, Slavonski Brod
T2  - Tehnički vjesnik
T1  - Contribution to research of spoiler and dome deflector tvc systems in rocket propulsion
EP  - 915
IS  - 4
SP  - 907
VL  - 22
DO  - 10.17559/TV-20140621063849
ER  - 

@article{
author = "Davidović, Nikola and Miloš, Predrag and Jojić, Branislav and Miloš, Marko",
year = "2015",
abstract = "Physical model of spoiler and dome deflector thrust vector control (TVC) system was established considering previous and current research observations. According to logic of physical model an engineering mathematical model is derived. Model algorithm and results were analysed and explained. Finally, model data were confirmed with real motor tests.",
publisher = "Univ Osijek, Tech Fac, Slavonski Brod",
journal = "Tehnički vjesnik",
title = "Contribution to research of spoiler and dome deflector tvc systems in rocket propulsion",
pages = "915-907",
number = "4",
volume = "22",
doi = "10.17559/TV-20140621063849"
}

Davidović, N., Miloš, P., Jojić, B.,& Miloš, M.. (2015). Contribution to research of spoiler and dome deflector tvc systems in rocket propulsion. in Tehnički vjesnik
Univ Osijek, Tech Fac, Slavonski Brod., 22(4), 907-915.
https://doi.org/10.17559/TV-20140621063849

Davidović N, Miloš P, Jojić B, Miloš M. Contribution to research of spoiler and dome deflector tvc systems in rocket propulsion. in Tehnički vjesnik. 2015;22(4):907-915.
doi:10.17559/TV-20140621063849 .

Davidović, Nikola, Miloš, Predrag, Jojić, Branislav, Miloš, Marko, "Contribution to research of spoiler and dome deflector tvc systems in rocket propulsion" in Tehnički vjesnik, 22, no. 4 (2015):907-915,
https://doi.org/10.17559/TV-20140621063849 . .

TY  - JOUR
AU  - Davidović, Nikola
AU  - Miloš, Predrag
AU  - Elmahmodi, Aiman
AU  - Miloš, Marko
AU  - Jojić, Branislav
AU  - Todić, Ivana
PY  - 2014
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2044
AB  - Sintetički gas je danas ko-proizvod procesa kao što su gasifikacija otpada i prerade biomase, uglja i drugih potencijalnih goriva. Iako sastav sintetičkog gasa zavisi od prethodnih procesa, generalno se sastoji od mešavine vodonika, ugljen-monoksida i metana u različitim odnosima. Ideja da se sintetički gas dobijen preradom otpada koristi kao gorivo za turbo-generator je veoma privlačna, ali i vrlo zahtevna. U ovom radu je prezentovana modifikacija postojećeg turbo-vratilnog motora da bi mogao da koristi sintetički gas kao gorivo. Pored problema kao što su mala toplotna moć, drugačiji stehiometrijski odnos u poređenju sa kerozinom i visok procenat vodonika, inženjerski zadatak je bio da se problem reši sa minimalnim brojem izmena. Problem je rešen modifikaciojom postojećih vazdušnih raspršivača i verifikovan je eksperimentalno.
AB  - Synthetic gas is nowadays the co-product of procceses such as waste gasification and processing biomass, coal and other potentional fuels. Although its composition depends on previous process, synthetic gas is generally mixture of hydrogen, carbon-monoxide and methane in different ratios. The idea to use gases from waste as a fuel for gas-turbine generator producing electric energy is very attractive but also challenging. In this paper is presented modification of an existing turbo-shaft engine in order to be capable to operate with synthetic gas. Together with problems such as low heating value of the gas, different stochiometric ratio of gas and air compared to kerosene/air combination and high hydrogen contents, the engineering task was to do it with minimum number of changes. Problem is solved by adjusting existing airblast atomizers and experimentally verified.
PB  - Univerzitet u Beogradu - Mašinski fakultet, Beograd
T2  - FME Transactions
T1  - Modifikacija postojećeg turbovratilnog motora da bi kao gorivo koristio sintetički gas
T1  - Modification of existing turboshaft engine in order to operate on synthetic gas
EP  - 117
IS  - 2
SP  - 112
VL  - 42
DO  - 10.5937/fmet1402112D
ER  - 

@article{
author = "Davidović, Nikola and Miloš, Predrag and Elmahmodi, Aiman and Miloš, Marko and Jojić, Branislav and Todić, Ivana",
year = "2014",
abstract = "Sintetički gas je danas ko-proizvod procesa kao što su gasifikacija otpada i prerade biomase, uglja i drugih potencijalnih goriva. Iako sastav sintetičkog gasa zavisi od prethodnih procesa, generalno se sastoji od mešavine vodonika, ugljen-monoksida i metana u različitim odnosima. Ideja da se sintetički gas dobijen preradom otpada koristi kao gorivo za turbo-generator je veoma privlačna, ali i vrlo zahtevna. U ovom radu je prezentovana modifikacija postojećeg turbo-vratilnog motora da bi mogao da koristi sintetički gas kao gorivo. Pored problema kao što su mala toplotna moć, drugačiji stehiometrijski odnos u poređenju sa kerozinom i visok procenat vodonika, inženjerski zadatak je bio da se problem reši sa minimalnim brojem izmena. Problem je rešen modifikaciojom postojećih vazdušnih raspršivača i verifikovan je eksperimentalno., Synthetic gas is nowadays the co-product of procceses such as waste gasification and processing biomass, coal and other potentional fuels. Although its composition depends on previous process, synthetic gas is generally mixture of hydrogen, carbon-monoxide and methane in different ratios. The idea to use gases from waste as a fuel for gas-turbine generator producing electric energy is very attractive but also challenging. In this paper is presented modification of an existing turbo-shaft engine in order to be capable to operate with synthetic gas. Together with problems such as low heating value of the gas, different stochiometric ratio of gas and air compared to kerosene/air combination and high hydrogen contents, the engineering task was to do it with minimum number of changes. Problem is solved by adjusting existing airblast atomizers and experimentally verified.",
publisher = "Univerzitet u Beogradu - Mašinski fakultet, Beograd",
journal = "FME Transactions",
title = "Modifikacija postojećeg turbovratilnog motora da bi kao gorivo koristio sintetički gas, Modification of existing turboshaft engine in order to operate on synthetic gas",
pages = "117-112",
number = "2",
volume = "42",
doi = "10.5937/fmet1402112D"
}

Davidović, N., Miloš, P., Elmahmodi, A., Miloš, M., Jojić, B.,& Todić, I.. (2014). Modifikacija postojećeg turbovratilnog motora da bi kao gorivo koristio sintetički gas. in FME Transactions
Univerzitet u Beogradu - Mašinski fakultet, Beograd., 42(2), 112-117.
https://doi.org/10.5937/fmet1402112D

Davidović N, Miloš P, Elmahmodi A, Miloš M, Jojić B, Todić I. Modifikacija postojećeg turbovratilnog motora da bi kao gorivo koristio sintetički gas. in FME Transactions. 2014;42(2):112-117.
doi:10.5937/fmet1402112D .

Davidović, Nikola, Miloš, Predrag, Elmahmodi, Aiman, Miloš, Marko, Jojić, Branislav, Todić, Ivana, "Modifikacija postojećeg turbovratilnog motora da bi kao gorivo koristio sintetički gas" in FME Transactions, 42, no. 2 (2014):112-117,
https://doi.org/10.5937/fmet1402112D . .

TY  - CONF
AU  - Kolarević, Nenad
AU  - Davidović, Nikola
AU  - Miloš, Predrag
AU  - Jojić, Branislav
AU  - Miloš, Marko
PY  - 2013
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1765
PB  - Croatian Society of Mechanics
C3  - 30th DANUBlA-ADRIA Symposium on Advances in Experimental Mechanics, DAS 2013 - Proceedings
T1  - Experimental determination of light helicopter rotor lift characteristics with tip-jet propulsion system
EP  - 269
SP  - 268
UR  - https://hdl.handle.net/21.15107/rcub_machinery_1765
ER  - 

@conference{
author = "Kolarević, Nenad and Davidović, Nikola and Miloš, Predrag and Jojić, Branislav and Miloš, Marko",
year = "2013",
publisher = "Croatian Society of Mechanics",
journal = "30th DANUBlA-ADRIA Symposium on Advances in Experimental Mechanics, DAS 2013 - Proceedings",
title = "Experimental determination of light helicopter rotor lift characteristics with tip-jet propulsion system",
pages = "269-268",
url = "https://hdl.handle.net/21.15107/rcub_machinery_1765"
}

Kolarević, N., Davidović, N., Miloš, P., Jojić, B.,& Miloš, M.. (2013). Experimental determination of light helicopter rotor lift characteristics with tip-jet propulsion system. in 30th DANUBlA-ADRIA Symposium on Advances in Experimental Mechanics, DAS 2013 - Proceedings
Croatian Society of Mechanics., 268-269.
https://hdl.handle.net/21.15107/rcub_machinery_1765

Kolarević N, Davidović N, Miloš P, Jojić B, Miloš M. Experimental determination of light helicopter rotor lift characteristics with tip-jet propulsion system. in 30th DANUBlA-ADRIA Symposium on Advances in Experimental Mechanics, DAS 2013 - Proceedings. 2013;:268-269.
https://hdl.handle.net/21.15107/rcub_machinery_1765 .

Kolarević, Nenad, Davidović, Nikola, Miloš, Predrag, Jojić, Branislav, Miloš, Marko, "Experimental determination of light helicopter rotor lift characteristics with tip-jet propulsion system" in 30th DANUBlA-ADRIA Symposium on Advances in Experimental Mechanics, DAS 2013 - Proceedings (2013):268-269,
https://hdl.handle.net/21.15107/rcub_machinery_1765 .

TY  - CONF
AU  - Damjanović, S.
AU  - Miloš, Predrag
AU  - Davidović, Nikola
AU  - Jojić, Branislav
AU  - Miloš, Marko
PY  - 2013
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1668
PB  - Croatian Society of Mechanics
C3  - 30th DANUBlA-ADRIA Symposium on Advances in Experimental Mechanics, DAS 2013 - Proceedings
T1  - Measuring of resultant aerodinamyc force on vertical tail of the tip-jet helicopter
EP  - 265
SP  - 264
UR  - https://hdl.handle.net/21.15107/rcub_machinery_1668
ER  - 

@conference{
author = "Damjanović, S. and Miloš, Predrag and Davidović, Nikola and Jojić, Branislav and Miloš, Marko",
year = "2013",
publisher = "Croatian Society of Mechanics",
journal = "30th DANUBlA-ADRIA Symposium on Advances in Experimental Mechanics, DAS 2013 - Proceedings",
title = "Measuring of resultant aerodinamyc force on vertical tail of the tip-jet helicopter",
pages = "265-264",
url = "https://hdl.handle.net/21.15107/rcub_machinery_1668"
}

Damjanović, S., Miloš, P., Davidović, N., Jojić, B.,& Miloš, M.. (2013). Measuring of resultant aerodinamyc force on vertical tail of the tip-jet helicopter. in 30th DANUBlA-ADRIA Symposium on Advances in Experimental Mechanics, DAS 2013 - Proceedings
Croatian Society of Mechanics., 264-265.
https://hdl.handle.net/21.15107/rcub_machinery_1668

Damjanović S, Miloš P, Davidović N, Jojić B, Miloš M. Measuring of resultant aerodinamyc force on vertical tail of the tip-jet helicopter. in 30th DANUBlA-ADRIA Symposium on Advances in Experimental Mechanics, DAS 2013 - Proceedings. 2013;:264-265.
https://hdl.handle.net/21.15107/rcub_machinery_1668 .

Damjanović, S., Miloš, Predrag, Davidović, Nikola, Jojić, Branislav, Miloš, Marko, "Measuring of resultant aerodinamyc force on vertical tail of the tip-jet helicopter" in 30th DANUBlA-ADRIA Symposium on Advances in Experimental Mechanics, DAS 2013 - Proceedings (2013):264-265,
https://hdl.handle.net/21.15107/rcub_machinery_1668 .

TY  - CONF
AU  - Kosanović, N.
AU  - Davidović, Nikola
AU  - Miloš, Predrag
AU  - Jojić, Branislav
AU  - Miloš, Marko
PY  - 2013
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1741
PB  - Croatian Society of Mechanics
C3  - 30th DANUBlA-ADRIA Symposium on Advances in Experimental Mechanics, DAS 2013 - Proceedings
T1  - Monitoring of engine parameters in tip jet helicopter tests
EP  - 267
SP  - 266
UR  - https://hdl.handle.net/21.15107/rcub_machinery_1741
ER  - 

@conference{
author = "Kosanović, N. and Davidović, Nikola and Miloš, Predrag and Jojić, Branislav and Miloš, Marko",
year = "2013",
publisher = "Croatian Society of Mechanics",
journal = "30th DANUBlA-ADRIA Symposium on Advances in Experimental Mechanics, DAS 2013 - Proceedings",
title = "Monitoring of engine parameters in tip jet helicopter tests",
pages = "267-266",
url = "https://hdl.handle.net/21.15107/rcub_machinery_1741"
}

Kosanović, N., Davidović, N., Miloš, P., Jojić, B.,& Miloš, M.. (2013). Monitoring of engine parameters in tip jet helicopter tests. in 30th DANUBlA-ADRIA Symposium on Advances in Experimental Mechanics, DAS 2013 - Proceedings
Croatian Society of Mechanics., 266-267.
https://hdl.handle.net/21.15107/rcub_machinery_1741

Kosanović N, Davidović N, Miloš P, Jojić B, Miloš M. Monitoring of engine parameters in tip jet helicopter tests. in 30th DANUBlA-ADRIA Symposium on Advances in Experimental Mechanics, DAS 2013 - Proceedings. 2013;:266-267.
https://hdl.handle.net/21.15107/rcub_machinery_1741 .

Kosanović, N., Davidović, Nikola, Miloš, Predrag, Jojić, Branislav, Miloš, Marko, "Monitoring of engine parameters in tip jet helicopter tests" in 30th DANUBlA-ADRIA Symposium on Advances in Experimental Mechanics, DAS 2013 - Proceedings (2013):266-267,
https://hdl.handle.net/21.15107/rcub_machinery_1741 .