Investigation of second generation controlled-diffusion compressor blades in cascade
Hansen, Dennis J.
Hobson, Garth V.
MetadataShow full item record
Detailed experimental investigation of second generation controlled-diffusion compressor stator blades at design inlet-flow angle was performed in a low-speed cascade wind tunnel using various experimental methods. Surface pressure measurements were obtained using three instrumented blades, from which coefficients of pressure were calculated. Laser-Doppler velocimetry was used to characterize the flow in the inlet, in the passage between two blades, in the boundary layer of the blades, and in the wake. A five-hole pressure probe was used to determine the loss coefficient and the axial-velocity-density ratio of the flow through the cascade. Although the blades produced significant lift, separated flow was discovered on the suction side of the blades at approximately fifty percent axial chord, which showed that the design was not totally successful. All the experimental measurements were performed at an inlet flow Mach number of 0.22 and a Reynolds number, based on chord length, of 640,000. Experimental blade-surface pressure coefficients were compared with values predicted using a computational fluid dynamics code. These initial predictions did not match well with the experimental results.
Approved for public release; distribution unlimited.
Showing items related by title, author, creator and subject.
Bang, H.; Agrawal, B.N. (1993);A closed loop switching function for single-axis slew maneuvers of spacecraft using on-off thrusters is investigated by analytical simulations and experimental demonstrations. The proposed switching function provides ...
Song, G.; Kelly, B.; Agrawal, B.N. (2000);This paper presents the design and the experimental result of the active position control of a shape memory alloy (SMA) wire actuated composite beam. The composite beam has a honeycomb structure with SMA wires embedded in ...
Improving Defense Acquisition Processes with Evidence-based Analysis: An Illustrative Case Using the DoD SBIR Program Edison, Toby (Monterey, California. Naval Postgraduate School, 2010-04-30); NPS-AM-10-056This paper proposes and demonstrates that experimental and quasi-experimental program evaluation methods can be applied to some parts of the defense acquisition system to provide evidence of program effectiveness. The ...