Partial cavity shedding on a hydrofoil resulting from re-entrant flow and bubbly shock waves
Abstract
Partial cavity flows forming on a NACA0015 hydrofoil are visualized using high-speed cinematography and time-resolved X-ray densitometry. These observations reveal the underlying flow features that lead to the cloud cavity shedding. Previous studies have reported that both near-surface liquid re-entrant flow and bubbly shock waves can serve as the mechanisms causing cavity pinch-off and cloud shedding. We identify both mechanisms in the current study. The cavity shedding frequency was also examined and related to the underlying flow dynamics. The probability of re-entrant flow or bubbly shock-induced shedding processes are quantified, and the likelihood of each mechanism is shown to be a function of both the cavitation number and the Mach number of the bubbly mixture within the separated region of the cavity. When the Mach number of the two-phase mixture in the cavity exceeds unity, shock waves become the dominant mechanism that lead to large-scale cavity shedding and cloud cavitation.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Feb 23, 2023
- Source ID
- 10.1017/jfm.2022.999
Entities
People
- Anubhav Bhatt
- Harish Ganesh
- Steven L. Ceccio
Organizations
- Office of Naval Research