Download LABYRINTH SEAL PREPROCESSOR AND POST

API reference case
30000
Qe (lbf/in)
20000
10000
0
Synchronous
Non-syn
-10000
-20000
0
0.2
0.4
0.6
0.8
1
Swirl Ratio
Figure 4-14 Influence of Inlet Gas Swirl Ratio on Effective Cross-Coupling
Stiffness ( Balance Piston Labyrinth Seal )
Effect of pressure ratio (Pr) variation, in Figure 4-15, for non-synchronous type of
case, on QeBP has minimal influence. However, for synchronous type of case instead of
Qe decreasing with increase in Pr, as in the case of Impeller # 1 labyrinth eye seal, QeBP
radically increases. Figure 4-16 show results of variation of Ncr by setting rotor speed
(N) constant at 21662 rpm. A similar trend to eye seal (Figure 4-5) is observed here,
except QeBP for non-synchronous case remains constant and both curves cross each other
at a higher Ncr. Likewise, Figure 4-17 show results of variation of Ncr and N by setting
both equal. On comparing the results with eye seal (Figure 4-6), adverse influence on
QeBP is observed.
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