Document Type : Research Studies
Authors
1
Mechanical Power Engineering Department, Faculty of Engineering, Mansoura University, El-Mansoura 35516, Egypt
2
Professor of Mechanical Power Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
3
Professor of Mechanical Power Engineering Department., Faculty of Engineering., Mansoura University., El-Mansoura 35516., Egypt.
4
Instructor., Mechanical Power Engineering Department., Faculty of Engineering., Mansoura University., El-Mansoura 35516., Egypt.
Abstract
Flow characteristics in AR=2, AS = 2, 180° curved diffuser is investigated experimentally by a 5-hole Pitot tube, The Pitot tube is calibrated by a special orientation mechanism to get a calibration data file to be processed by the multi-probe program. Measurements of the three velocity components (u, v, w), total and static pressures for the inlet and six downstream sections located at 30° intervals from the diffuser inlet, from convex to concave walls and top to bottom walls. The wall static pressures in the inid-span between the top and bottom walls at convex and concave walls were measured. Contours of the third velocity component show the secondary motion clearly induced by the movement of fluid from convex to concave wall and reverse. The maximum transverse velocity is about 20% of inlet mean velocity as a result of low aspect ratio of the diffuser exit. The overall pressure recovery achieved was 25.6% of the inlet dynamic pressure due to separation and recirculation occurred at the convex wall. These measurements can be used for the validation and inprovement of the turbulence models that used to simulate the flow inside the curved diffuser. It was found that the models predict a later
Main Subjects
)
View on SCiNiTO