Low speed wind tunnel test of the jet trainer model at high angles of attack

• Autorzy: Smędra K. , Świerkot R. , Kubryński K.

Identyfikatory

DOI

10.5604/12314005.1217285

• Języki publikacji: EN

Abstrakty

EN

The article discusses the results of the wind tunnel test of the model of the highly manoeuvrable jet trainer, in the wide range of angles of attack. The main objective of this work was to modify the geometry in order to achieve the assumed properties (stability, control and dynamic behaviour in terms of high angles of attack), and possibly reliable verification of characteristics. In order to control the geometry of subsequent variants of aerodynamic models during the test, the full parametric representation of the CAD geometry was used (applying Siemens NX system) and the modular construction of the models. This enables to change the various components (e.g. the front part of the fuselage, the air inlets, wings, tail, strakes etc.). The wind tunnel models were produced using 3D printers, based on the FDM (Fused Deposition Modelling) method. This allows for relatively fast model prototyping while maintaining full control of geometry and very low cost. Studies were conducted using several models differing in geometry as well (in order to determine the effect of blockage) model scale implementation. Studies carried out in a low speed wind tunnel using an internal balance mounted on bent sting (to enable measurement at high angles of attack). The measurements were carried out in the range of angles of attack -2° to 56° and slip angles +/- 20°, with different deflections of leading edge flaps, trailing edge flaps, elevator, rudder and ailerons. The static aerodynamic characteristics of final version of the model indicates the correct properties in the entire range of flight conditions: the ability to ensure a longitudinal balance with appropriate longitudinal moments necessary to control (reduce the angle of attack), the correct dynamic characteristics at high angles of attack (no pro-spin trend) and the ability to lateral and directional control. Some interesting novelty that will be presented in the paper is a preliminary evaluation of the dynamic properties of the aircraft at high angles of attack, carried out on the model in the tunnel, providing three degrees of freedom (rotation about all three axes).

Słowa kluczowe

EN

aerodynamics; aerodynamic project; high angles of attack aerodynamics; manoeuvrability

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2016
• Tom: Vol. 23, No. 4
• Strony: 471--478
• Opis fizyczny: Bibliogr. 7 poz., rys.

Twórcy

autor

Smędra K.

• Air Force Institute of Technology Księcia Bolesława Street 6, 01-494 Warsaw, Poland tel.: [phone], fax: [phone]

autor

Świerkot R.

• Air Force Institute of Technology Księcia Bolesława Street 6, 01-494 Warsaw, Poland tel.: [phone], fax: [phone]

autor

Kubryński K.

• Air Force Institute of Technology Księcia Bolesława Street 6, 01-494 Warsaw, Poland tel.: [phone], fax: [phone]

Bibliografia

• [1] Kubryński, K., Conceptual and Aerodynamiuc Study of a Highly Maneuverable Jet Trainer, Journal of KONES Powertrain and Transport, Vol. 23, No. 4, 2016.
• [2] High Angle of Attack Aerodynamics – AGARD Conference Proceedings, CP-247, 1979.
• [3] Special Course on Aerodynamic Characteristics of Controls – AGARD Report, R-711, 1983.
• [4] Mason, W. H., High Angle of Attack Aerodynamics – http://www.dept.aoe.vt.edu/~mason/ /Mason_f/ConfigAeroHiAlphaNotes.pdf.
• [5] Whitford, R., Design fir Air Combat, Janes 1987.
• [6] Technologies for Highly Maneuverable Aircraft – AGARD Conference Proceedings, CP-548, 1994.
• [7] Wind Tunnel Wall Corrections, AGARD AG-336, NATO, 1998.

Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.