| 摘要 |
<p>Three-dimensional (3D) return vane for a multistage centrifugal compressor. The return channel vane (204, 208) extends upstream to a region proximate the bend apex (210, 212) of the return channel. In each point of the return channel vane, the angle "beta" is defined as the acute angle between the tangent to the local camberline and the local circumferential direction. At each normalised position between leading edge and trailing edge, the local twist of the return channel vane is defined as the algebraic difference [beta_hub-beta_shroud] between the angles beta at the two points at hub and shroud having said normalised position. When moving in streamwise direction from leading edge to trailing edge, the twist first decreases, reaching an algebraic minimum, then increases, reaching an algebraic maximum, then decreases again. However, the absolute twist of the algebraic minimum is larger than the absolute twist of the algebraic maximum.</p> |
