Velocity Profiles in a Long Inlet Duct Employing a Photon Correlating Laser Velocimeter Without Seeding
Abstract
This thesis involves a practical application of the Malvern Laser Velocimeter System (LV). In this work, the LV was used to measure mean velocity profiles across the inside diameter of a duct which supplies air to the compressor of jet engine. The engine, which is a General Electric J-85 turbo-jet engine is located in the Propulsion Laboratories of Wright-Patterson Air Force Base in Ohio. In addition to the mean velocity profiles, the LV was used to measure turbulence intensity profiles across the inside diameter of the duct at each of the three test points. To analyse the quality of the LV data as obtained, alternate mean velocity profiles and turbulence intensity profiles were obtained with the aid of a Hot Wire Anemometer System and a Pitot-Static Tube. During each of the traverses, or tests, with the LV System, the Hot Wire System and the Pitot-Static Tube, the engine was held at a fixed RPM, being 50% or 70% of maximum engine RPM. Good correlation was achieved between each of the three systems in respect to the mean velocity profiles obtained at each of the three test positions while the turbulence intensity profiles matched well in the regions of the flow where turbulence levels of 2% to 30% encountered.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1979
- Accession Number
- ADA079878
Entities
People
- Harley J. V. Rogers
Organizations
- Air Force Institute of Technology