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1
Content available remote Deficiency-surplus transition function (DeSuTra) in semi-empirical formulas for tumbling of freely falling card
Vorohobovs Vladimirs, Kleinhofs Martins
Composites Theory and Practice
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2022
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R. 22, nr 2
92--98
EN
A new phenomenological method for composing analytical formulae to describe dynamic systems using the DeSuTra function as a building block is introduced. Based on heuristic considerations, it is possible to write a correct formula with several unknown coefficients. Next, these coefficients are tuned such a way that the result coincides with the experimental data. To illustrate the viability of such a method, a simple but not trivial aerodynamic system was chosen: the autorotation of a rectangular piece of paper that falls in air. Three correction coefficients (diminishers) were introduced to calculate its rotation frequency Then a simple expression for the Magnus effect and drag force was used. All the obtained formulae were experimentally proved and the coefficients calculated. The conclusions drawn confirm the usefulness of the presented calculation procedure for the design of composites with chaotically distributed reinforcements.
2
Content available Parametric study on the flow field generated by river barge bow steering systems
Abramowicz-Gerigk Teresa, Burciu Zbigniew, Jachowski Jacek
Zeszyty Naukowe Akademii Morskiej w Szczecinie
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2019
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nr 60 (132)
9--17
EN
Low controllability under strong winds presents a problem for the operation of inland vessels, which can be improved using passive bow rudders and transverse thrusters. Bow thrusters can sufficiently improve the manoeuvrability at low speeds, but an unsolved problem is course maintaining and yaw checking of a vessel at medium and high speeds. This paper proposes the use of a bow steering system in which the bow rotors generate a Magnus force. The first physical test model of the system showed promising results and that much more research must be performed before this system can be used in industrial applications. The paper presents the results of a numerical study on the flow field generated by bow rotors. The first stage of a ship’s turn using the bow rotors was used to determine the dependence of the expected steering force on the inflow velocity and rotational speed of the rotors. The influence of the flow generated by the bow steering system on river banks and quay walls during manoeuvres was also discussed.
3
Content available CFD simulation study of air flow around the airfoil using the Magnus effect
Sokołowski P., Czarnigowski J., Magryta P.
Applied Computer Science
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2015
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Vol. 11, no 3
19--33
EN
The article presents a simulation study of air flow around the airfoil equipped with an additional rotary element, using the Magnus effect to change the air flow around it. For this purpose, a two-dimensional computational model for the airfoil without and with the moving element was made. The model was based on the airfoil NACA 8-H-12. The article describes a method of creating a model in two versions: without moving computational grid and with moving computational grid. Studies were carried out for a typical flow rate corresponding to the flow velocity around the gyroplane in a nominal flight speed conditions. Article shows a comparison of flows in both cases, and assesses the impact of the geometry that use the Magnus effect on the work of airfoil.
4
Content available Badania modelowe w tunelu aerodynamicznym wirników wiatrowych typu Magnusa o poziomej osi obrotu
Matys P., Flaga A.
Budownictwo i Architektura
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2013
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Vol. 12, nr 2
151--156
PL
Praca przedstawia wyniki badań eksperymentalnych w tunelu aerodynamicznym wirników typu Magnusa o poziomej osi obrotu. Najpierw przeprowadzono pomiary aerodynamicznej siły bocznej (nośnej) oraz oporu aerodynamicznego na wirującym walcu dołączonym do wagi aerodynamicznej. Następnie wykonano badania wirnika jednołopatowego z przeciwwagą.
EN
The paper presents results of wind tunnel tests of horizontal axis wind rotors of Magnus type. Firstly, measurements of aerodynamic side (lift) force and aerodynamic drag on rotating cylinder attached to horizontal aerodynamic balance were performed. Secondly, the model of single-blade rotor with counterbalance was tested.
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