A High-Speed Direct Detection X-ray Camera for the Examination of Cavitating Flows of Naval Interest
Abstract
High void-fraction bubbly and cavitating flows are common in naval applications such as sheet and cloud cavitation occurring in flows through propulsor blade passages, control surfaces, wakes, etc. Sheet and cloud cavitation occurring in such scenarios is a significant source of erosion and performance deterioration. Understanding the interplay between the gas and liquid phases is crucial forfurthering our understandingof these flows, and X-ray based measurement allow us to examine and measure theseopaque flows. Our group has used time-resolved radiation-based densitometry to studysuch flows, revealing the importance of mixture compressibility in thedynamics of theseflows. In addition, the use of X-ray densitometry has also resulted in the establishment ofhigh-fidelity experimental datasets for numerical code validation. In this proposal, we seekto upgrade our measurement capability by acquiring two direct detection, high frame rateX-ray cameras. The use of direct detection X-ray cameras has significant advantages overthe conventional phosphor screen-based scintillators coupled with an image intensifier and a high-speed camera that we currently employ. The cameras are manufactured byDECTRIS Ltd., the leading specialist in the manufacture of hybrid-pixel X-ray and electrondetectors. High-speed direct detection X-ray cameras with dual energy bins can achievehigher temporal (~4 kHz at full resolution) and spatial resolution compared to X-raydetection using a phosphor screen and image intensifier. In addition, direct detection withdual energy bins can provideadditional information that can be used for phaseidentification. Direct detection based sensors have better signal-to-noise ratio and dynamic range compared to image intensifier-based detection. Acquisition of these X-ray cameras would augment our existing capabilities to investigate cavitating flows of naval interest. These high-speed X-ray cameras will be used to study problems of naval interest such as unsteady cavitation occurring on a pitching hydrofoil, cavitating wakes behind a 3-D bluffbody, and other dynamic cavitating flows.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jul 24, 2023
- Source ID
- N000142312677
Entities
People
- Harish Ganesh
Organizations
- Board of Regents of the University of Michigan
- Office of Naval Research
- United States Navy