Abstract
The paper deals with the problems of cavitation in water flow in the nozzle. The area of research is divided into two directions (experimental and numerical research). During the experimental research the equipment with the nozzle is under the measurement and basic physical quantities such as pressure and volume flow rate are recorded. In the following phase measuring of noise which is generated during flow through the nozzle in the area of cavitation is measured at various operating conditions of the pump. In the second part the appropriate multiphase mathematical model including the consideration of cavitation is defined. Boundary conditions for numerical simulation are defined on the basis of experimental measurements. Undissolved air in the flow is taken into account to obtain pressure distribution in accordance to measured one. Results of the numerical simulation are presented by means of basic current quantities such as pressure, velocity and volume fractions of each phase. The conclusions obtained from experimental research of cavitation were applied to modify the multiphase mathematical model.
Highlights
Cavitation is fairly common phenomenon in issues connected with hydrodynamics and pumps
It dominates at flow rate equal to 2.61 l/s, the dissolved air starts to play more significant role
The mass flow rate of air was added (Qa) and set to the value which leaded to higher pressure at the inlet, which is close to the measured values
Summary
Cavitation is fairly common phenomenon in issues connected with hydrodynamics and pumps. Hydrodynamic cavitation, the one most common in hydraulic equipment, can be observed in areas of lowered pressure and higher velocity appearance. In pumps it is near the leading edge of rotor blades. As the cavitation phenomenon is highly unsteady and includes complicated interaction between phases, there are different mathematical models describing it [5,6,7]. They consider mainly on vapour phase creation in the flow. Aim of this paper is to confront results of the mathematical simulation with an experiment
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