离心压缩机回流通道各部件间流动耦合作用机制及优化设计研究

Study on the flow coupling mechanism and optimization design of the components in the return channel of centrifugal compressor

中文关键词: 离心压缩机  静止部件  回流通道  数值模拟

英文关键词: centrifugal compressor  stationary parts  return channel  numerical simulation

中文摘要:

      针对大流量系数离心压缩机中间级静止部件内部流动特征及部件间相互作用，通过依次施加弯道的影响得到了4种结构，使用数值模拟方法研究了回流通道各部件间的相互影响规律。结果表明：总压损失系数和气流角的分布规律表明，进出口弯道和回流器之间的强相互作用，U型弯道产生的损失最多。进口剖面会对回流通道内部损失产生重大影响，仅考虑回流器叶片而忽视弯道影响无法真实反映流动状态。根据回流通道各部件间相互作用规律，对损失最大的U型弯道轮毂侧子午流道进行优化调整，优化后模型整体变工况性能提升0.5%，回流器轮毂侧流动分离得到抑制。

英文摘要:

      This study investigated the internal flow characteristics and component interactions within the intermediate stator components of a high flow coefficient centrifugal compressor. Four structural configurations were constructed by progressively incorporating the effects of different components step by step. Numerical simulations were used to analyze the interaction patterns between the components of the static channel. The results show that: the predicted total pressure loss coefficient and flow angle indicate that there is a strong interaction between the inlet bend （U-bend） and the return channel. The same is true for the return channel and the outlet bend （L-bend）. The U-bend produces the highest losses. The inlet cross-section has a significant effect on the losses within the return duct, and considering only the return duct vanes and neglecting the influence of the bends does not accurately represent the flow conditions. Based on the observed interaction patterns between the different components of the static channel, adjustments are made to the hub side of the U-bend. The optimized model shows an overall efficiency improvement of 0.5% in off-design performance, with suppressed flow separation on the hub side of the return channel.