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100,z_,, 100 ,a I AAI aAk 'k_ 80 a 80 ADesign _" A _" n Q. 60 a _60 a 40 a _ p 40 noA t_ n I intent z_ • 20 0 ,a a 20 ,a _" _n 60 '_ p 40 O _o ' _ .... 4.5 .60 = i i i I . Z_ . . T .... I , , .65 .70 .75 .80 Temperature ratio, T_)Fr_, 0 .6 ' ' ' .7 .8 , I '_ ' .9 1.0 AI Figure 13.--Radial variation of exit-to-inlet total temper- ature ratio at design operating condition for rotor I- stator I configuration, 100 Efficiency, "qL3 Figure 15.--Radial variation of total efficiency measured at rotor exit at design operating condition for rotor I- stator I configuration. ' _ Design = a 80 "_I,0.\ A 1.0 -- pressure ratio, P_)/P3 1.2 . • i .... I = i .... . i .... Equivalent ="_ .6 ....... 5.0 iA .-s ,_ _ 3 _ n"_ .4 intent--_ f 'a .-°.8\; 4.0 (3. A O _. :_ I I 20 0 2 A . ' , /_' . 3 4 5 Pressure ratio, P_)/P_, _ .2 0.,.i.... i.... -50 0 50 100 150 200 6 Measure- Figure 14.--Radial variation of exit-to-inlet total pressure ratio at design operating condition for rotor I-stator I configuration. Figure 15 shows the total efficiency, based on the tempera- ture measurements taken by the survey instrumentation, as it static pressure measured at the design speed for various pres- varies at the exit of the rotor from hub to tip. There is almost a linear variation from hub to tip with a marked decrease right at the hub. As figures 13 and 14 suggest, the area near the hub is operating at a higher efficiency because of the larger work extraction and a lower pressure, Static pressures were measured along the shroud of the tur- bine by several pressure taps located from the inlet of the stator (starting at the leading edge of the stator) and ending at ment Percent meridional distance on shroud station 0 1 2 3 4 Figure 16._Shroud static pressures over flow path for rotor I configuration. sure ratios is shown in figure 16. Static pressure decreased through the stator and the rotor at about the same rate. At the design pressure ratio, the amount of pressure drop in the stator was approximately 50 percent; another 50 percent of the pres- sure drop occurred in the rotor. Varying the inlet-to-exit pres- sure ratio caused the stator to have an approximately constant pressure drop because the rotor was choking. Figure 17 shows thestaticpressurevariationovertherotorportionoftheshroud. station 4. Appendix C gives the locations of these ports. The 11PDF Image | Aerodynamic Radial Inflow Turbine Rotors
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