Accession Number : ADA255728


Title :   L.D.V. Measurements of Unsteady Flow Fields in Radial Turbine


Descriptive Note : Final rept.


Corporate Author : CINCINNATI UNIV OH DEPT OF AEROSPACE ENGINEERING AND ENGINEERING MECHANICS


Personal Author(s) : Tabakoff, W ; Pasin, M


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a255728.pdf


Report Date : Jul 1992


Pagination or Media Count : 165


Abstract : Detailed measurements of an unsteady flow field within the inlet guide vanes (IGV) and the rotor of a radial inflow turbine were performed using a three component Laser Doppler Velocimeter (LDV) system together with a rotary encoder. The mean velocity, the flow angle and the turbulence contours for IGV passages are presented at four blade-to-blade planes for different rotor positions to give three dimensional, unsteady behavior of the IGV flow field. These results are compared with the measurements obtained in the same passage in the absence of the rotor. The flow field of the IGV passage was found to be affected by the presence of the rotor. The ratio of the tangential normal stresses to the radial normal stresses at the exit of the IGV was found to be more than doubled when compared to the case without the rotor. The rotor flow field measurements are presented as relative mean velocity and turbulence stress contours at various cross section planes throughout the rotor. The cross flow and turbulence stress levels were found to be influenced by the incidence angle. Transportation of the high turbulence fluid by the cross flow was observed downstream in the rotor blade passages.


Descriptors :   *TURBINES , *UNSTEADY FLOW , *AERODYNAMICS , MEASUREMENT , TURBULENCE , BLADES , ROTORS , CROSS FLOW , INLET GUIDE VANES , ROTOR BLADES , EXITS , ANGLE OF INCIDENCE , LASERS , FLOW FIELDS , CROSS SECTIONS , FLUIDS


Subject Categories : Jet and Gas Turbine Engines


Distribution Statement : APPROVED FOR PUBLIC RELEASE