离心压气机无叶扩压器内部流动三维数值研究

发布时间：2019-04-29 10:45

【摘要】：无叶扩压器是离心压气机的重要部件,研究其内部流场掌握其流动特点,对于提升无叶扩压器性能及了解失速诱发原因具有重要意义。本文利用Workbench15.0软件对离心压气机进行模型建立和数值模拟,对不同流量下离心叶轮和无叶扩压器内部流场进行分析。结果表明:无叶扩压器回流区首先出现在其轮毂侧,随着流量的减小回流区出现在无叶扩压器前盘侧,当流量进一步降低回流区出现在无叶扩压器壁面两侧;出现回流区时无叶扩压器并不会立即进入失速状态,随着回流区域的扩展当其中一侧回流区发展到无叶扩压器出口时无叶扩压器进入旋转失速状态;无叶扩压器内的不稳定流动状态可以用无叶扩压器内静压升系数表示,无叶扩压器失速发生时静压升系数也会随之下降。
[Abstract]:Vaneless diffuser is an important part of centrifugal compressor. It is of great significance to study its internal flow field and master its flow characteristics in order to improve the performance of vaneless diffuser and understand the cause of stall induction. In this paper, the Workbench15.0 software is used to model and simulate the centrifugal compressor, and the internal flow fields of centrifugal impeller and vaneless diffuser with different flow rates are analyzed. The results show that the return flow zone of the vaneless diffuser first appears on the hub side of the diffuser, and appears on the front disk side of the vaneless diffuser with the decrease of the flow rate. When the flow rate decreases further, the backflow zone appears on both sides of the wall of the vaneless diffuser. The vaneless diffuser does not immediately enter the stall state when the backflow zone appears, and the vaneless diffuser enters the rotating stall state when one side of the backflow zone develops to the outlet of the vaneless diffuser. The unsteady flow state in the vaneless diffuser can be expressed by the static pressure rise coefficient in the vaneless diffuser, and the static pressure rise coefficient in the vaneless diffuser will decrease when the stall occurs.
【作者单位】：华北电力大学电站设备状态监测与控制教育部重点实验室;
【基金】：国家自然科学基金项目(11602085) 河北省自然科学基金项目(E2016502098)~~
【分类号】：TH452

【相似文献】