Title: Study on Transition of Flow Regime in the Cavitation Process of a Circular Cylinder. Comparison with Basic Flow Characteristics and Trip-Wire Effect.
Abstract:It has been well known that flow separation pattern from a circular cylinder varies qualitatively near the critical Reynolds number. The interaction of separated flow with cavitation bubbles is very i...It has been well known that flow separation pattern from a circular cylinder varies qualitatively near the critical Reynolds number. The interaction of separated flow with cavitation bubbles is very important for predicting cavitation characteristics. In the present investigation, the interaction between cavitation bubbles and separated flow is examined near the critical regime of a circular cylinder in the double-peak cavitation process. The changes in flow characteristics accompanying cavitation occurrence and development are compared with basic flow characteristics such as base pressure coefficient, shoulder pressure coefficient and Strouhal number obtained in noncavitating states. Further experiments were made using a circular cylinder with a trip wire. These results experimentally confirm that the occurrence of cavitation bobbles can induce the transition of critical Reynolds number region and a double-peak-type cavitation process.Read More