Accession Number : ADA327034

Title :   Passage-Averaged Description of Wave Rotor Flow.

Descriptive Note : Technical memo.,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER

Personal Author(s) : Welch, Gerald E. ; Larosiliere, Louis M.

PDF Url : ADA327034

Report Date : JUL 1997

Pagination or Media Count : 11

Abstract : The unsteady flow within wave rotor passages is influenced by the rotor blade, hub, and tip shroud surface profiles. By averaging from hub to shroud and from blade to blade, a reduced set of the governing equations is obtained that is appropriate for design studies and parametric analyses. The application of these equations requires closure models for force integrals and for correlation terms that arise when the density averages of products of the flow field variables are expanded in terms of products of the density-averaged variables. The force integrals and the correlation terms depend on the instantaneous pitchwise and spanwise flow field distributions established by unsteadiness relative to the rotor, flow turning induced by blade, hub, and tip-shroud profiling, and rotation. Two approaches to model the force integrals are described. The influence of relative unsteadiness and flow turning on the correlation terms is discussed by considering the propagation of gas dynamic waves in rotor passages defined by uncambered, staggered blades and by unstaggered, cambered blades.

Descriptors :   *GAS TURBINES, *TURBOMACHINERY, *ROTOR BLADES(TURBOMACHINERY), PARAMETRIC ANALYSIS, MODELS, INTEGRALS, FLOW FIELDS, UNSTEADY FLOW, HUBS, FLUID DYNAMICS, WAVES.

Subject Categories : Hydraulic and Pneumatic Equipment
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE