Page 270 - The Tribology Handbook
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byrinths, brush seals and throttling bu




                                      r$%?            l/c = 0.375    n = number  of  blades

                                                        = 6.2 5
                                                          I---
                                                      0 = 300°K


                                    - *
                                    0.38mm          1 rnm
                                   (0.015 in)      10.040 in)
                                         I












                    0.5





                                                          P max.  -                                        0.2

                     n                                                                                     n
                               2         :3       4        5         6        7         8        9       10"

                                                         P atmos.


                 TEMPERATURE
                                                                   STEPPED LABYRINTH
                                                   17.3
                 For other temperatures multiply Qm/A by -         For a stepped labyrinth use an 'effective' n value, kn:
                                                   fl                (see below right)
                 GEOMETRY

                 For other values of slc or llc multiply Qm/A by g:
                   (see below left)




                                                                         3.0
                  "'-5
                  a
                  5                                                      2.5
                  d
                  >                                                   t  2.0
                                                                       I
                  E 1.0                                               Y
                  w                                                      1.5
                  z
                  0
                  w
                  0                                                      1.0
                   0.5                                                   0.5
                     0.4   0.6  0.8  1.0   2.0   4.0   6.0  8.0 10.0       0   1   2  3 +--   5   6   7  8
                                                                                          4
                                        1. IC,
                                         Figure 22.8  Calculation of mass flow rate of labyrinth
                                                              B22.5
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