6926475962

84-1655

Theoretical and ExperimenUl Dynamie Stall Investi-gations on a Rotor Blade Tip

W. Geissler

Deutsche Forschungs- und Versuchsanstalt f. Luft-und Raumfahrt e.V.. Freiburg im Breisgau. Fed. Rep. Germany, 6 pp (1982) (Pres. at Symp. on Numerical and Physical Aspects of Aerodynamic Flows (2nd). Jan 17-20, 1983, California State Univ„ Long Beach, CA)

AD-P001 950

Key Words: Blades, Propeller blades, Aerodynamic loads

Theoretical and experimental inyestigations have be en carried out on oscillating blade tips at moderate and high steedy main incidences and oscillation amplitudes. Some sełected data of these tejts are compered with a previou$ly davek>ped prediction method based on potential theory to inyestigate the main effects of viscosity in different domains of dynamie stall. A simple correction procedurę is described to taka into account the main effects of viscosity on the unsteady airloads. To get a morę detailed insight into the baginning of unstaady separation on oscillatng profiles a fłnitfrdifference procedura has been developed to calcu-late the unsteady boundary-layer equatk>ns. This method has been applied to the oscillating fiat piata problem as a first step.

84-1657

Finite Element Dynamie Analyaia of a Rotating Turbinę Blade

H.T. Belek and A. Tamura

Istanbul Technical Univ., Turkey, ASME-83-GTJ-22

Key Words: Blades, Turbinę blades. Rotating structures, Finite element technique

A finite element dynamie analysts of a rotating turbinę blade is performed using the isopar8metric Shell elements. The number of Gauss integration points on the element surface along the natural ooordinate directions is yaried and the effects on the natural frepuencies is inyestigeted. Hance the optimum Gauss integration order is detarmined.

84-1658

Flexible Conformable Clampa for a Machining Celi with Applications to Turbinę Blade Machining

E. Kurokawa

Robotics Inst.. Carnegie-Mellon Univ., Pittsburgh. PA. Rept. No. CMU-RI-1R-83-16. 34 pp (May 1983)

AD-A134 942

Key Words: Blades. Turbinę blades. Natural freguencies

84-1656

Holographic Interferometry Technśque for Meaauring Tran ao nic Fl o w Near a Rotor Blade

J.K. Kittleson

NASA Ames Res. Ctr., Moffett Field. CA, Rept. No. NASA-A-9432. NASA-TM-84405, USAAVRADCOM-TR-83-A-10, 24 pp (Aug 1983)

AD-A134 040

A flexible. conformable clamping schemefor a staam turbina blada machining cali isdiacusaad. Experiments that have been carried out to inyestigate the clamping eff(ciency of this novel design are alao described. Flexible fixtures for turbinę blade machining hava been devek>ped and instelled to demon-strate the reduction of human interyention for workpiece setup in a laboratory. The key feetures of the clemp design and the celi configuretion era described. The theory of yibration is reytewed and the experimental resuitsof damped natural frequencies of the clamped blade are preeented.

Key Words: Blades, Propeller blades, Helicopters, Interferometrie techniques, Holographic techniques

A technique that uset holographic interferometry to record the first interferograms of the flow near a hovering transonic rotor blade is presented. A pułsed ruby leser is u sad to record interferograms of a 2-ft-diam field of vlew near e rotor tip operating et a tip Mach number of 0.09. Severel interferograms, racordad along planes perpendiculer to the rotor's tip-peth-piane at vark>us azimuthal angles around the flow, are presented. These interferograms yield quantitative Information about shock structure and locatton, flow separation, and radiated noise that will help helicopter reseerchers undarstand the oomplexities of the flow around high-speed rotor blades and thut łmproye performance and raduce noise.

84-1659

Effects of SUtic Friction on the Forced Re^sonae of Frictionally Damped Turbinę Blades

A. Sinha and J.H. Griffin

Carnegie-Melłon Univ., Pittsburgh, PA 15213, J. Engrg. Gas Turbines Power, Trans. ASME, 106 (1), pp 65-69 (Jan 1984) 9 f igs, 13 refs

Key Words: Coulomb friction, Blades, Turbinę blades, Damped structures

The effect of static friction on the design of flexible blade-to-ground yibration dampers used in ges turbina enginet is

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