Design and Experimental Performance of a Two Stage Partial Admission Turbine
Final rept. Dec 1984-Jun 1986
ROCKWELL INTERNATIONAL CANOGA PARK CA ROCKETDYNE DIV
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A three-inch mean diameter, two-stage turbine with partial admission in each stage was experimentally investigated over a range of admissions and angular orientations of admission arcs. Three configurations were tested in which first stage admission varied from 37.4 percent 10 of 29 passages open, 5 per side to 6.9 percent 2 open, 1 per side. Corresponding second stage admissions were 45.2 percent 14 of 31 passages open, 7 per side and 12.9 percent 4 open, 2 per side. Angular positions of the second state admission arcs with respect to the first stage varied over a range of 70 degrees. Design and off-design efficiency and flow characteristics for the three configurations are presented. The results indicated that peak efficiency and the corresponding isentropic velocity ratio decreased as the arcs of admission were decreased. Both efficiency and flow characteristics were sensitive to the second stage nozzle orientation angles. Turbine performance, Two-stage partial admission turbine, Impulse turbine.
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