Visualization and velocity analysis of a high-speed modulated water jet generated by a hydrodynamic nozzle

0523474 - ÚGN 2021 RIV GB eng J - Článek v odborném periodiku
Zeleňák, Michal - Říha, Zdeněk - Jandačka, Petr
Visualization and velocity analysis of a high-speed modulated water jet generated by a hydrodynamic nozzle.
Measurement. Roč. 159, July 2020 (2020), č. článku 107753. ISSN 0263-2241. E-ISSN 1873-412X
Grant CEP: GA MŠMT(CZ) LO1406; GA ČR(CZ) GA19-00408S
Institucionální podpora: RVO:68145535
Klíčová slova: PIV * visualization of flow * self-excited modulated water het * hydrodynamic nozzle
Obor OECD: Mechanical engineering
Impakt faktor: 3.927, rok: 2020
Způsob publikování: Omezený přístup
https://www.sciencedirect.com/science/article/pii/S0263224120302918?via%3Dihub

This paper deals with visualization and velocity analysis of a self-excited water jet generated by a designed prototype of hydrodynamic nozzle. The high-speed camera in combination with four high-energy pulsed LED lights and the particle image velocimetry method were tested. The influence of water pressure on the jet shape, velocity field and frequency of the self-excited jet was studied. The designed diagnostic water line consisting of pressure sensors and a turbine flowmeter was used for flow monitoring during experimental flow visualization. It was observed that the used optical equipment is suitable for velocity-frequency investigation up to 40 MPa with the maximal jet velocity 247 m/sec, 4.5 kHz oscillation frequency. The overall speed dependence of velocity on the distance downstream from the nozzle outlet (0–100 mm) decreases by 13–15% for tested pressure levels. Oscillation of self-excited jet in the 10–40 MPa pressure range is changing in range 2.5–4.5 kHz.
Trvalý link: http://hdl.handle.net/11104/0308172