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Content Provider | The American Society of Mechanical Engineers (ASME) Digital Collection |
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Author | Zierke, W. C. Deutsch, S. |
Copyright Year | 1990 |
Abstract | Measurements, made with laser Doppler velocimetry, about a double-circular-arc compressor blade in cascade are presented for −1.5 and −8.5 deg incidence angles and a chord Reynolds number near 500,000. Comparisons between the results of the current study and those of our earlier work at a 5.0 deg incidence are made. It is found that in spite of the relative sophistication of the measurement techniques, transition on the pressure surface at the −1.5 deg incidence is dominated by a separation “bubble” too small to be detected by the laser Doppler velocimeter. The development of the boundary layers at −1.5 and 5.0 deg is found to be similar. In contrast to the flow at these two incidence angles, the leading edge separation bubble is on the pressure surface for the −8.5 deg incidence. Here, all of the measured boundary layers on the pressure surface are turbulent—but extremely thin—while on the suction surface, a laminar separation/turbulent reattachment bubble lies between roughly 35 percent and 60 percent chord. This bubble is quite thin, and some problems in interpreting the backflow data are discussed. |
Starting Page | 241 |
Ending Page | 255 |
Page Count | 15 |
File Format | |
ISSN | 0889504X |
e-ISSN | 15288900 |
Journal | Journal of Turbomachinery |
Volume Number | 112 |
Issue Number | 2 |
DOI | 10.1115/1.2927638 |
Language | English |
Publisher | The American Society of Mechanical Engineers |
Publisher Date | 1990-04-01 |
Access Restriction | Subscribed |
Subject Keyword | Blades Boundary layers Bubbles Cascades (Fluid dynamics) Chords (Trusses) Compressors Flow (Dynamics) Laser Doppler anemometry Lasers Measurement Pressure Reynolds number Separation (Technology) Suction Turbulence Velocimeters |
Content Type | Text |
Resource Type | Article |
Subject | Mechanical Engineering |
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