Název:	Turbulent jet stability increased by ribs inside the nozzle – Stereo PIV measurement one diameter past the nozzle
Autoři:	Duda, Daniel Abrhám, Vladimír Uruba, Václav Yanovych, Vitalii
Citace zdrojového dokumentu:	DUDA, D. ABRHÁM, V. URUBA, V. YANOVYCH, V. Turbulent jet stability increased by ribs inside the nozzle – Stereo PIV measurement one diameter past the nozzle. In 20th Conference on Power System Engineering. Pilsen: EDP Sciences, 2021. s. 1-7. ISBN: neuvedeno , ISSN: 2261-236X
Datum vydání:	2021
Nakladatel:	EDP Sciences
Typ dokumentu:	konferenční příspěvek ConferenceObject
URI:	http://hdl.handle.net/11025/47310
ISBN:	neuvedeno
ISSN:	2261-236X
Klíčová slova v dalším jazyce:	turbulent jet;nozzle;PIV
Abstrakt v dalším jazyce:	We observe that decreasing the inner nozzle surface by adding longitudinal ribs increases the jet stability in terms of the amount of turbulent kinetic energy in the near shear layer. We try to explain our observation as a stabilization effect of secondary flow vortices emerging in the corners of the ribs. These stream-wise vortices damage the development of larger-scale structures in the near shear layer. This explanation is supported by autocorrelation function of the stream-wise velocity component, which displays slightly smaller integral length-scale in the case with ribs than in the case of smooth nozzle. The experiment is performed at Reynolds number 2.2 × 105 (based on the nozzle diameter 50 mm); the Stereo-PIV (Particle Image Velocimetry) measurement takes place at the plane perpendicular to the jet axis one diameter past the nozzle exit. Optical 3D scanner controls the real nozzle geometry. This article presents preliminary measurement at single position and single velocity only; further exploration of this problem is needed.
Práva:	© authors
Vyskytuje se v kolekcích:	Konferenční příspěvky / Conference papers (KKE) OBD

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