Numerical simulation and experimental research of cavitation nozzle based on equation curve

To further investigate and improve the cleaning ability of the cavitation nozzle, this paper proposes a new model that is based on the Helmholtz nozzle and with the quadratic equation curve as the outer contour of the cavitation chamber. First, the numerical simulation of the flow field in the nozzl...

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Bibliographic Details
Published in:Water science & technology. Water supply 2021-08, Vol.21 (5), p.2261-2272
Main Authors: Wang, Lifu, Shi, Dongyan, Yang, Zhixun, Li, Guangliang, Ma, Chunlong, He, Dongze, Yan, Liang
Format: Article
Language:English
Subjects:
Cavitation
cavitation jet
cavitation model
cavitation nozzle
Chambers
Cleaning
Experimental research
Experiments
Fluid flow
High speed cameras
impact performance
Interfaces
Laboratory experimentation
Mathematical models
Morphology
Nozzle geometry
Nozzles
numerical simulation
Quadratic equations
Reynolds number
Simulation
Spectrum analysis
Turbulence models
Viscosity
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Summary:To further investigate and improve the cleaning ability of the cavitation nozzle, this paper proposes a new model that is based on the Helmholtz nozzle and with the quadratic equation curve as the outer contour of the cavitation chamber. First, the numerical simulation of the flow field in the nozzle chamber was conducted using FLUENT software to analyze and compare the impact of the curve parameters and Reynolds number on the cleaning effect. Next, the flow field was captured by a high-speed camera in order to study the cavitation cycle and evolution process. Then, experiments were performed to compare the cleaning effect of the new nozzle with that of the Helmholtz nozzle. The study results demonstrate that effective cavitation does not occur when the diameter of the cavitation chamber is too large. For the new nozzle, with the increase of the Reynolds number, the degree of cavitation in the chamber first increases and then decreases; the cleaning effect is much better than that of a traditional Helmholtz nozzle under the same conditions; the nozzle has the best cleaning effect for the stand-off distance of 300 mm.
ISSN:1606-9749
1607-0798
DOI:10.2166/ws.2021.058