Accession Number : AD0625783

Title :   BASIC STUDIES OF ROTATING STALL AND AN INVESTIGATION OF FLOW-INSTABILITY SENSING DEVICES. PART I. BASIC STUDIES OF ROTATING STALL FLOW MECHANISMS.

Descriptive Note : Final rept. for Feb 64-Oct 65,

Corporate Author : CORNELL AERONAUTICAL LAB INC BUFFALO N Y

Personal Author(s) : Brady,W. G. ; Ludwig,G. R.

Report Date : OCT 1965

Pagination or Media Count : 103

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)

Descriptors :   (*TURBOJET ENGINES, AXIAL FLOW COMPRESSORS), (*AXIAL FLOW COMPRESSORS, STALLING), (*STALLING, VORTICES), FLOW SEPARATION, STABILITY, FLOWMETERS

Subject Categories : Fluid Mechanics
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE