Fluid machine flow path with increased stage contraction ratios

摘要

The surface of the section of the ring channel with rotor and stator stages gives a contraction ratio of (QRS) between (0.2 +(KT-0.45)0.1) and 3.0 in which QRS = KR/KS. KT represents the total stage contraction in which QRS and KT are defined as QRS = KR/KS with KR = AR1/ARA and KS = AS1/ASA and KT = AR1/ASA, AR1 = pi(R2 2 - R1 2), ARA = pi(R4 2 - R3 2), AS1 = pi(R6 2 = R5 2) and ASA = pi(R8 2 - R7 2). R1 is the upstream rotor blade foot angle on shaft, R2 radius at upstream outermost radial point of the rotor blade, R3 the radius of downstream rotor blade foot angle on shaft and R4 the radially outermost point of the downstream blade. R6 denotes the radius at the downstream stator blade outermost point, R5 the radius at the upstream radially innermost point of the stator blade, R8 the radius of the upstream radially outermost point of the stator blade, and R7 is the radius of the radially innermost downstream point of the stator blade.