Počet záznamů: 1  

Axisymmetric nozzles with chamfered contraction

  1. 1. 0477171 - UT-L 2018 RIV CH eng J - Článek v odborném periodiku
    Tesař, Václav
    Axisymmetric nozzles with chamfered contraction.
    Sensors and Actuators A - Physical. Roč. 263, August (2017), s. 147-158. ISSN 0924-4247
    Institucionální podpora: RVO:61388998
    Klíčová slova: nozzles * chamfering * invariant
    Kód oboru RIV: BK - Mechanika tekutin
    Obor OECD: Fluids and plasma physics (including surface physics)
    Impakt faktor: 2.311, rok: 2017

    Paper discusses experimental results obtained in measurements of essentially incompressible flows inaxially symmetric nozzles with inlet entrance shaped as a 45◦ half-angle chamfering. Interest was concentrated on low Reynolds number conditions. Six differently behaving flow regimes, from A to F, were identified. In the regimes B and C, of most importance for engineering applications, the nozzles exhibit lower hydraulic loss than comparable nozzles with smooth, rounded inlet. In the regime C were identified secondary invariants valid for the whole family of nozzles with different lengths. Most probably due to the de-stabilising effect of vortices, shed from the vortex rings formed at the sharpentrance edge made by the chamfering, at increasing Reynolds number the nozzles with chamfered inlet enter quite soon a transition into turbulence.
    Trvalý link: http://hdl.handle.net/11104/0273618