Some Considerations about the Rotating Cell Structure

[摘要] Rotating stall instability in axial flow compressors arises when the mass flow is reduced at constant rotational speed. Despite the number of experimental andtheoretical work already published in the scientific literature, many questions still remain unanswered. Acomplete model that could be of help both in the design process and in the modelling process of existing enginesis not yet available. A fundamental research program has been carried out at the Department of MechanicalEngineering of the University of Cagliari with the scope of reaching a better understanding of the basic flow field structures and of the global performance in stall. The cinematic structure of the cell during abrupt full 1-cell stall in a two-stageaxial flow compressor with IGV has been analysed with the aid of hot-wire anemometer and of a total pressureprobe. The results have revealed interesting features about the cell flow structures and their variations alongthe stalled performance branch of the compressor. The present paper aims at pursuing further the flow analysisincluding the investigation of upstream flow field. Therefore, the inlet duct has been extended to perform themeasurements. The complete flow field measurements will allow to obtain a complete cinematic description ofthe cell.

[学科分类] 力学，机械学