AN EXPERIMENTAL STUDY OF ANNULAR DIFFUSER PERFORMANCE | ||||
| ERJ. Engineering Research Journal | ||||
| Article 14, Volume 25, Issue 2, April 2002, Page 173-186 PDF (570.96 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/erjm.2002.70757 | ||||
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| Authors | ||||
| Mofreh H. Hamed; Elsayed H. Farag. | ||||
| Department of Mechanical Power Engineering, Faculty of Engineering, Menoufiya University, Shebin El-Kom, Egypt | ||||
| Abstract | ||||
| The work described in this paper is concerned mainly with an experimental investigation of subsonic turbulent flows through annular diffusers having divergence angles of 17.5 and 9 degrees for the casing and hub, respectively, with an area ratio of 2.1. The performance of the tested diffuser was measured for a variety of throat dimensionless velocity (1) using different strut geometries. Two kinds of struts with airfoil and cylindrical cross-sections were installed separately at different locations inside the tested diffuser. The results indicated that, the magnitude of the dimensionless velocity (h) at the throat perimeter is dependent upon the strut cross-section and its location. The performance of the tested diffuser is improved when cylindrical struts with suitable diameters are set at an appropriate position in the diffuser. Increasing the blockage due to the presence of struts was found to be substantially increases the tendency of separation. The total loss coefficient due to nonuniformity of flow at the diffuser entrance was found to be significantly greater on the casing than that on the hub. It appeared also that, a better performance was achieved with the cylindrical struts due to the increase in turbulent mixing in the wake region. | ||||
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