离心压缩机排气蜗壳内部流动分析与优化

利用计算流体动力学专业软件NUMECA对某离心压缩机末级流场(包括闭式叶轮、无叶扩压器、排气蜗壳)进行三维粘性流动的数值计算分析.以计算结果为依据,对等宽变高式排气蜗壳进行了优化设计,末级效率提高约4.5%.将改进方法用于另一台压缩机组的末级排气蜗壳,末级效率同样提高4.5%,由此总结出"焊接式排气蜗壳气动设计规范",并将其应用于另一类典型的焊接式排气蜗壳--等高变宽式排气蜗壳的优化设计,末级效率提高约3%.大量的数值试验证明,所提出的设计方法具有很好的通用性,可以推广应用于所有的焊接式排气蜗壳设计.

Analysis and Optimization of the Internal Flow in Centrifugal Compressor Volute

The 3D internal viscous flow in the last stage of a centrifugal compressor is analyzed numerically with commercial computational fluid dynamic software NUMECA. The geometric model includes the close-type impeller, the vaneless diffuser and the volute. Based on the analytic results, modifications to the constant width volute are proposed and the stage efficiency is increased by 4.5%. The same approach is applied on the last stage of another centrifugal compressor and the efficiency is also increased by 4.5%....