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Showing 1 to 7 of 7 for “"Cavitation Number"”.
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An investigation into the design of surface piercing super cavitating hydrofoils
… complex fluid dynamic mechanisms like unsteady cavitation and ventilation and their interaction. For speeds considerably higher than the incipient cavitation speed, the hydrofoil sections need to be adapted and design to exploit cavitation instead of avoiding it. This is particularly true for …
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NATURAL AND VENTILATED CAVITATING FLOW OVER HIGH-SPEED UNDERWATER VEHICLE
Cavitation occurs around the underwater vehicle when the vehicle moves fast. We conducted the numerical calculation of natural and ventilated cavitating flow. The mechanism of the free surface and bottom wall effects on the cavity profile and stability are studied. Then we present a new passive …
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Some flow characteristics of spool valve orifices
… orifices. (Aspect ratio 2.5 - 45}. Reynolds number is varied from 200 to 3000 and cavitation number from 0.15 to 0.8.Valve geometry effects are examined by (a) varying the orifice opening and clearance and (b) by providing each valve with an additional movable boundary wall. · Both flow into …
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Data Analysis of an Unsteady Cavitating Flow on a Venturi-type Profile
… mean flow, to the smaller scales such as cloud cavitation and Kelvin-Helmholtz (KH) instability. It is demonstrated that the POD decorrelation of length scales yields inherently quasi-periodic time dynamics, e.g., incommensurate frequencies. Moreover, the eigenvalue obtained from DMD revealed …
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A Study of Instability Mechanisms Driving Cloud Cavitation: Experimental Analysis Using New Advanced Velocimetry and Evaluation of Numerical Models
Hydrodynamic cloud cavitation, characterized by the periodic shedding and violent collapse of large vapor structures, poses significant risks to the integrity and performance of hydraulic machinery. Despite extensive research, the precise interaction between competing shedding mechanisms, …
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Experimental study and characterization of bubble behaviors in the orifice-induced hydrodynamic cavitation
… the development process of orifice-induced cavitation and transitional bubble behaviors. The transition from non-cavitation to fully developed cavitation was carefully studied. Cavitation bubble clouds were observed at orifice, indicating the inception of cavitation. The number of bubbles …
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Multihole injectors for direct-injection gasoline engines
… to visualize the nozzle flow patterns and cavitation development. The images identified the onset of cavitation in multi-hole gasoline nozzles and revealed the transition from pre-film to film stage cavitation. Cavitation strings were also visualized inside the injection hole that could …