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Surface number Surface number z T 0_ 02 I 6 hub. S OR of impeller blades .................................... from radial, deg ................................... Tested rpm ............................................... TABLE I.--BLADE SURFACE COORDINATES ON SURFACES OF REVOLUTION OF NASA LOW-SPEED tip of the blade (not the casing or shroud) axial distance, cm radial distance, cm tangential coordinate of lower surface, rad tangential coordinate of upper surface, rad Number Backsweep Rotation is such that surface 1 is the leading or pressure side of the blade and surface 2 is the trailing or suction side of the blade• With the blade tangential coordinates defined as in figure 3, the rotation rate will have a positive sign to be algebraically consistent. Surface number J (¢_z,t r 01 02 0.635 cm existed between the impeller disk at exit 1 0.00(O 2 0.00366 3 0.00732 4 0.01097 5 0.01463 6 0.01829 7 0.02195 8 0.02560 9 0.02926 10 0.03292 11 0.03658 12 0.04023 13 0.04359 14 0.04724 15 0.05273 16 0.06066 17 0.07041 18 0.08443 19 0.10516 20 0.13564 21 0.17922 22 0.24018 23 0.32339 24 0.43647 25 0.57638 26 0.72695 27 0.88910 28 1.06345 29 1.25090 30 1.45237 31 1.66878 32 1.90134 33 2.15128 34 2.41981 35 2.70845 36 3.01843 37 3.35158 38 3.70911 -0.00828 -0.01076 -0.01187 -0.01272 -0.01347 -0.01414 -0.01474 -0.01531 -0.01585 -0.01637 -0.01685 -0.01732 -0.01777 -0.01821 -0.01884 -0.01973 -0.02074 -0.02211 -0.02399 -0.02654 -0.02986 -0.03404 -0.03920 -0.04552 -0.05261 -0.05957 -0.06647 -0.07338 -0.08027 -0.08715 -0.09405 -0.10121 -0.10872 -0.11660 -0.12483 -0.13344 -0.14241 -0.15173 39 4.09346 40 4.50647 41 4.94995 42 5.42635 43 5.93811 44 6.48736 45 7.07654 46 7.70900 47 8.38718 48 9.11443 49 9.89411 50 10.72926 51 11.62355 52 12.58062 53 13.60383 54 14.69715 55 15.86423 56 17.10873 57 18.43369 58 19.84278 59 21.33844 60 22.92309 61 24.59736 62 26.36124 63 28.21229 64 30.14502 65 32.14939 66 34.20770 67 36.29315 68 38.36304 69 40.35735 70 42.19590 71 43.78726 72 45.04609 73 45.91660 74 46.39117 75 46.51766 22.97643 23.13219 23.30044 23.48240 23.67961 23.89388 24.12675 24.37973 24.65558 24.95672 25.28560 25.64618 26.04181 26.47676 26.95621 27.48564 28.07177 28.72191 29.44398 30.24805 31.14507 32.14726 33.26922 34.52744 35.94080 37.53216 39.32865 41.36166 43.66900 46.29424 49.28372 52.68072 56.51602 60.79846 65.51737 70.65447 76.20000 -0.09283 -0.10347 -0.11442 -0.12567 .-0.13723 -0.14905 -0.16105 -0.17322 -0.18547 -0.19776 -0.21001 -0.22213 -0.23406 -0.24573 -0.25705 -0.26794 -0.27836 -0.28830 -0.29773 -0.30673 -0.31544 -0.32406 --0.33297 -0.34266 -0.35390 -0.36768 -0.38523 -0.40796 -0.43740 -0.47511 -0.52262 -0.58111 -0.65151 -0.73423 -0.78618 -0.82842 -0.87830 -0.93164 -0.97882 -1.04014 -1.08385 (cm) 21.47011 21.47164 21.47285 21.47438 21.47560 21.47712 21.47834 21.47987 21.48108 21.48261 21.48413 21.48535 21.48688 21.48809 21.49023 21.49328 21.49693 21.50212 21.51004 21.52132 21.53778 21.56064 21.59173 21.63348 21.68500 21.73986 21.79869 21.86147 21.92914 22.00168 22.07971 22.16414 22.25528 22.35342 22.45949 22.57410 22.69815 22.83196 (radians) -0.00828 -0.00599 -0.00512 -0.00447 -0.00395 -0.00351 -0.00309 -0.00274 -0.00241 -0.00213 -0.00186 -0.00159 -0.00136 -0.00115 -0.00087 -0.00050 -0.00011 0.00033 0.00084 0.00135 0.00178 0.00199 0.00179 0.00096 -0.00067 -0.00294 -0.00580 -0.00929 -0.01338 -0.01815 -0.02365 -0.02994 -0.03710 -0.04526 -0.05400 -0.06315 -0.07267 -0.08258 J (radians) cc,rn) (an) (radians) (radians) CENTRIFUGAL COMPRES Tested mass flow rates, kg/sec 20 55 1862 30 23.6 0.254 A gap of approximately and the stationary diffu_r hub back wall. This gap was sealed with a rope seal to reduce or eliminate any leakage into the flow. At 100-percent At 78.7-percent Clearance between rh d ........................................ m d ...................................... impeller tip and stationary casing, cm ......... 1from the hub .z. r 01 02 -0.16142 -0.17148 -0.18187 -0.19257 -0.20354 -0.21473 -0.22609 -0.23759 -0.24919 -0.26081 -0.27239 -0.28383 -0.29509 -0.30608 -0.31672 -0.32695 -0.33674 -0.34605 -0.35491 -0.36341 -0.37167 -0.37996 -0.38865 -0.39828 -0.40965 -0.42375 -0.44175 -0.46496 -0.49471 -0.53237 -0.57919 -0.63641 -0.70523 17PDF Image | Laser anemometer measurements of the three-dimensional rotor flow
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