BASIC STUDIES OF ROTATING STALL AND AN INVESTIGATION OF FLOW-INSTABILITY SENSING DEVICES. PART I. BASIC STUDIES OF ROTATING STALL FLOW MECHANISMS.
Abstract
The report describes an experimental and analytical investigation of flow processes basic to the problem of rotating stall in axial flow compressors. Boundary-layer studies show that simple analytical treatment of flow separation on a wall moving upstream is not feasible, whereas, partial analytical success was obtained for flow separation on a wall moving down-stream. A stability theory for small disturbances propagating rotationally in the mean swirled flow through a thin annulus with multiple actuators (blade rows) was derived. Comparisons with experimental rotating stall data show fair-to-good agreement of propagation velocities but inaccurate predictions of inception of instability. Additional research is proposed related to lift hysteresis on airfoils in separated flows, time-delay inherent in the leading-edge separation process, and modification and extension of the developed stability theory. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1965
- Accession Number
- AD0625783
Entities
People
- G. R. Ludwig
- W. G. Brady
Organizations
- Calspan