An Experimental Investigation of Steady and Unsteady Flow Field in an Axial Flow Turbine

An Experimental Investigation of Steady and Unsteady Flow Field in an Axial Flow Turbine
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
Total Pages: 386
Release: 2018-07-23
Genre:
ISBN: 9781723515354
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Measurements were made in a large scale single stage turbine facility. Within the nozzle passage measurements were made using a five hole probe, a two-component Laser Doppler Velocimeter (LDV), and a single sensor hot wire probe. These measurements showed weak secondary flows at midchord, and two secondary flow loss cores at the nozzle exit. The casing vortex loss core was the larger of the two. At the exit radial inward flow was found over the entire passage, and was more pronounced in the wake. Nozzle wake decay was found to be more rapid than for an isolated vane row due to the rotor's presence. The midspan rotor flow field was measured using a two-component LDV. Measurements were made from upstream of the rotor to a chord behind the rotor. The distortion of the nozzle wake as it passed through the rotor blade row was determined. The unsteadiness in the rotor flow field was determined. The decay of the rotor wake was also characterized. Zaccaria, M. and Lakshminarayana, B. Glenn Research Center NASA-CR-4778, NAS 1.26:4778, E-10771 NAG3-555; RTOP 523-26-33...

Experimental Investigation of a 4 1/2-stage Turbine with Very High Stage Loading Factor

Experimental Investigation of a 4 1/2-stage Turbine with Very High Stage Loading Factor
Author:
Publisher:
Total Pages: 100
Release: 1974
Genre: Aerodynamic load
ISBN:
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The results of the Task 1 and 2 turbine design work are reported. Preliminary design is discussed. Blading detailed design data are summarized. Predicted performance maps are presented. Steady-state stresses and vibratory behavior are discussed, and the results of the mechanical design analysis are presented. -- [V]. I The experimental test program results of a 4 1/2-stage turbine with a very high stage loading factor are presented. A four-stage turbine was tested with and without outlet turning vanes. The 4 1/2-stage turbine achieved a design point total-to-total efficiency of 0.853. The outlet turning vane design point performance was 0.4 percent of the overall 4 1/2-stage turbine efficiency. Tests were conducted at various levels of Reynolds number and indicated decreases in turbine efficiency and equivalent weight flow with decreasing Reynolds number. --[V]. II.