Expected Capability of Multiple - Probe LDV Propulsor Inflow Measuring System
Abstract
The submarine propulsor and maneuvering technology program will provide a better understanding of the forces, moments, and acoustic behavior characterizing an underwater vehicle during a maneuver. Propulsor performance during the maneuver is particularly important, since it is a primary determinant of vehicle trajectory. Hydrodynamic measurements in this program will improve the reliability of and confidence in current analytical model predictions. For some maneuvers, flow predictions have not previously been possible. Flow phenomena isolated and defined by program measurements axial and tangential inflow velocities and propulsor forces should provide the understanding needed to build new analytical models. In this report, the capability of the propulsor inflow velocity measuring system for a self-propelled model is projected. This system will provide the first measurements of the propulsor inflow field during maneuvering to support development of computational models of propulsor performance. The proposed measuring system uses seven miniature laser-Doppler- velocimeter probes. Temporal and spatial resolution that can be obtained with the system are estimated relative to flow time scales. Operation in both scanned and non-scanned modes is recommended. Measurement of the propulsor inflow field will be effectively instantaneous relative to the maneuvering time scale. Keywords: Laser Doppler velocimeters; Time scales; Underwater maneuvering.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1990
- Accession Number
- ADA220778
Entities
People
- David J. Fry
- Mark T. Coughran