论文部分内容阅读
对一级轴流和离心叶轮组成的组合压气机非定常流场进行模拟,通过影响因素分组法,讨论了上游轴流叶轮尾迹与下游离心叶轮势流共同对中间静叶气流非定常流动的干涉特性及离心叶轮势流单独对静叶气流非定常流动造成的影响,并得到轴流叶轮与静叶间、轴流叶轮与离心叶轮间和静叶与离心叶轮间的干涉现象对下游离心叶轮进口气流产生的影响.结果表明:当上游轴流叶轮叶片尾迹和下游离心叶轮势流在中间静叶流道内发生耦合叠加时,会导致两种影响因素出现彼此相互激励或抑制现象;在离心叶轮进口处,轴流叶轮与静叶间、轴流叶轮与离心叶轮间和静叶与离心叶轮间的叠加干涉相位不同,将会导致此处气流产生畸变,直接影响离心叶轮进口气流角的非定常波动幅值.
The unsteady flow field of a combined compressor consisting of a first-stage axial flow and a centrifugal impeller is simulated. By means of influencing factor grouping method, the interference of the upstream axial flow impeller wake and the downstream centrifugal impeller flow on the unsteady flow of the intermediate stator vane flow is discussed Characteristics and centrifugal impeller potential alone on unsteady flow unsteady flow caused by the impeller and the impeller and the stator blade between the axial flow impeller and centrifugal impeller and the impeller and the centrifugal impeller between the phenomenon of centrifugal impeller downstream import The results show that when the wake of the upstream axial flow impeller and the centrifugal flow of the downstream centrifugal impeller couple and superimpose in the flow path of the middle stator vane, the two kinds of influencing factors will cause mutual excitation or inhibition. When the centrifugal impeller inlet Department of axial impeller and the static blade between the axial impeller and the centrifugal impeller and the stator and the centrifugal impeller superimposed between the interference phase will result in airflow distortion here directly affect the Centrifugal impeller inlet flow angle unsteady fluctuations Amplitude.