An Investigation of the Aerodynamic Characteristics of a Rotating Axial-Flow Blade Grid
Abstract
The report contains the results of an experimental investigation of the aerodynamic characteristics of a rotating axial-flow blade grid with pressure-increasing effect. Several techniques of measurement were applied: namely, pressure distribution measurements, pitot tube, and hot wire wake surveys. The results of these measurements were used as the basis of an analysis of the flow through the rotating grid, in particular, of those effects not present in a fixed grid and of the factors not accounted for in the two-dimensional theory of axial-flow blade grids. It was found that radial displacement of the boundary layer delays the stall of the root section and induces early stall of the tip section which may become critical for the pumping limit of the blade row. Interaction of boundary layers along the casing and the hub and along the blade surfaces through radial flow represents a major factor not accounted for in the two-dimensional theory of blade grids. Of similar importance upon efficiency and operating characteristics is the radial displacement of the wakes.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1947
- Accession Number
- ADA801351
Entities
People
- John R. Weske