Accession Number : ADA333407

Title :   Experimental and Numerical Investigation of Second-Generation, Controlled-Diffusion, Compressor Blades in Cascade

Descriptive Note : Master's thesis

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Grove, Darren V.

PDF Url : ADA333407

Report Date : JUN 1997

Pagination or Media Count : 90

Abstract : This thesis contains a detailed experimental and numerical investigation of second-generation, controlled-diffusion, compressor-stator blades at an off-design inlet-flow angle of 39%5c Investigation of the blades took place in a low-speed cascade wind tunnel using various experimental procedures. The objective of the wind tunnel study was to characterize the flow field in and around the blades at the off-design angle, and to investigate flow separation near the mid-chord for a high Reynolds number of 640,000. Rake probe survey's were performed upstream and downstream of the blades in order to obtain spanwise total pressure profiles. Surface flow visualization was performed on the blades using a titanium dioxide and kerosene mixture. Blade surface pressure measurements were obtained using a 40-hole instrumented blade from which coefficients of pressure were calculated. A standard optics, two-component, laser-Doppler velocimeter was used to characterize the flow field upstream, in the boundary layer on the suction side of the blades, and in the wake region. A numerical investigation was conducted using the rotor viscous code 3-D developed by Dr. Roderick Chima of NASA Lewis Research Center. Overall, good agreement between flow visualization, blade pressure measurements, laser measurements, and numerical modeling was obtained.

Descriptors :   *COMPRESSOR BLADES, *CASCADES(FLUID DYNAMICS), NUMERICAL ANALYSIS, THESES, FLOW VISUALIZATION, PRESSURE MEASUREMENT, FLOW FIELDS, COEFFICIENTS, STATORS, DIFFUSION, DOPPLER SYSTEMS, FLUID DYNAMICS, TITANIUM DIOXIDE, FLOW SEPARATION, WIND TUNNELS, REYNOLDS NUMBER, KEROSENE, LASER VELOCIMETERS.

Subject Categories : Hydraulic and Pneumatic Equipment
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE