离心压缩机排气蜗壳内部流动分析与优化.pdfVIP

第 45 卷第 5 期 机 械 工 程 学 报 Vol.45 No.5 2009 年 5 月 JOURNAL OF MECHANICAL ENGINEERING May 2009 DOI ：10.3901/JME.2009.05.311 离心压缩机排气蜗壳内部流动分析与优化* 1 1 2 2 冀春俊 王雅君 王学军 么立新 (1 ．大连理工大学能源与动力学院 大连 116023 ； 2 ．沈阳鼓风机(集团)有限公司 沈阳 110000) 摘要：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。 关键词：离心压缩机 焊接式排气蜗壳 数值模拟 效率 中图分类号：TK474.82 Analysis and Optimization of the Internal Flow in Centrifugal Compressor Volute JI Chunjun1 WANG Yajun1 WANG Xuejun2 YAO Lixin2 (1. School of Energy and Power Engineering, Dalian University of Technology, Dalian 116023; 2 ．Shenyang Blower Works (Group) Co., Ltd., Shenyang 110000 ) Abstract ：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%. Through summing up the effect of different parameters, the code for the aerodynamic design of the welding type volute is developed. The code is tested on another compressor with a constant height volute and the last stage efficiency is increased by 3%. Numerical experiments prove th