A slip factor calculation in centrifugal impellers based on linear ...

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( ) = K cos( ) cos β β1, eqv D High blade load<strong>in</strong>g 1 K D = Stall conditions K 1 2K T T K T = c c a2 a1 t t 1 2 ⎛ ⎜ ⎝ 2b ⎞ ⎟⎠ h 0. 1 14
Maximal pressure gradient Analysis of experimental data of Howell (1945), Emery (1957), Bunimovich (1967)allows obta<strong>in</strong><strong>in</strong>g follow<strong>in</strong>g equation for coefficient of static pressure rise at stall conditions (maximal pressure rise) m ( ) = K cos( ) cos β st β1, eqv D ∆P 2 ρ w 1 = b ∫ 0 1 st 2 ⎛ = 1− ⎜ ⎝ w w 2, st 1, st ⎞ ⎟ ⎠ 2 1 ⎛ cos = 1− ⎜ ⎝ cos ( ) 2 β ⎞ 1eqv, st ⎟ 1. 124 = ( β ) ⎟ 1+ m t 2eqv, st ( w ) ∫ SuctionSide − w1 db ( w1 − wPr essureSide) Parameter mst characterizes type of the cascade. E.g. For cascades studied by Howell mst =1. t = t / b is relative pitch of the l<strong>in</strong>ear cascade b 0 K D = K K 1 2 T T ⎠ K T db = c c a2 a1 st t t 1 2 ⎛ ⎜ ⎝ 2b ⎞ ⎟⎠ h 0. 1 15
Page 1 and 2: A slip fac
Page 3 and 4: Rotors with splitters or with high
Page 5 and 6: Slip flow in Centr
Page 7 and 8: ∆P ρ w 1 General Inviscid ∆P
Page 9 and 10: ( ) w / w ( w / w ) 2 2 ( ) = K cos
Page 11 and 12: W 1 K Calculation of the coefficien
Page 13: Impellers with high blade load<stro
Page 17 and 18: Results 510.6 165 60.05 0.612 1.0 1
Page 19 and 20: Measured and calculated sli
Page 21: Conclusions • Suggested method al

A slip factor calculation in centrifugal impellers based on linear ...

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