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离心压气机进气弯管与蜗壳非对称结构在周向上的相对位置会使压气机性能发生变化,为了明确引起压气机性能发生改变的原因,给弯管安装方式的选择及压气机的设计提供理论指导,采用实验和计算相结合的方法,研究了带有直管和不同周向安装位置的180°弯管进气方式的离心压气机工作特性及内部流动特性。结果表明:改变弯管与蜗壳非对称结构在周向上的相对位置,弯管出口流场畸变区域在周向上的位置会发生变化,从而改变了其与叶轮出口畸变流场的耦合作用效果,因此压气机性能发生变化。两种畸变流场间的相互作用会影响叶轮内部流场的周向均匀程度。当弯管出口低静压区域与叶轮出口高静压区域作用于相同叶片槽道进出口时,叶轮内部流场周向上的分布最不均匀,在这种情况下的压气机性能低于其他弯管安装角度下的压气机性能。为了保证安装弯管后离心压气机性能相对直管进气的下降程度不超过3%,应该使弯管出口高静压区域与叶轮出口高静压区域施加于相同叶片槽道。基于上述原则,确定了压气机效率下降较小的弯管安装周向位置的选择范围。
Centrifugal compressor intake manifold and volute asymmetric structure in the circumferential relative position will make the compressor performance changes, in order to clearly cause the compressor performance changes, the choice of elbow installation and the design of the compressor The theoretical guidance and the combination of experiment and calculation are provided to study the operating characteristics and internal flow characteristics of a 180 ° elbow-type air intake system with straight pipe and different circumferential installation locations. The results show that changing the relative position of the curved pipe and the volute asymmetrical structure in the circumferential direction changes the circumferential position of the flow field at the outlet of the elbow and thus changes the coupling effect with the distorted flow field at the exit of the impeller. The compressor performance therefore changes. The interaction between the two distorted flow fields affects the circumferential uniformity of the flow field inside the impeller. When the low hydrostatic pressure zone at the outlet of the elbow and the high hydrostatic pressure zone at the outlet of the impeller act on the inlet and outlet of the same vane channel, the distribution of the internal flow field in the impeller is the most uneven in the circumferential direction, and the performance of the compressor in this case is lower than that of other curves Compressor performance under tube installation. In order to ensure that the performance of the centrifugal compressor after the installation of the elbow pipe does not drop by more than 3% relative to that of the straight inlet pipe, the high hydrostatic pressure zone at the elbow outlet and the high hydrostatic pressure zone at the exit of the impeller should be applied to the same vane channel. Based on the above principles, the selection range of the circumferential position of the elbow installed with a small decrease of the compressor efficiency is determined.