GREENHOUSE IMPLEMENTATION ON FLOW SEPARATION IN DIFFUSERS | ||||
| ERJ. Engineering Research Journal | ||||
| Article 11, Volume 31, Issue 1, January 2008, Page 91-99 PDF (415.7 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/erjm.2008.69508 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| A.S. Abdelhameed; A. AbdElmotalip | ||||
| Mechanical Power Department, Faculty of Engineering Port-Said, Suez Canal University, Egypt | ||||
| Abstract | ||||
| An experimental investigation was carried out to study the greenhouse adaptation, as a method, to prevent separation at different values of Reynolds numbers in a sub-sonic two-dimensional flatwalled diffuser. The greenhouse implementation is attained by using a cotton screen, as impedance, of specific porosity to slow down the hot air flow near the exit of the diffuser. The average velocity and fluctuation fields have been measured with a constant temperature hot–wire anemometer (CTA).However, in reversed flow zones pressures have been measured using 5-hole-probe. The experimental measurements of velocity and pressure were made at six stations of the diffuser, for different Reynolds numbers and specific value of porosity. The experimental results showed that the greenhouse can be used to achieve separation delay, separation prevention, and pressure recovery coefficient improvement in particular, for increasing Reynolds number. However, using the greenhouse adaptation to prevent separation is not the only advantage but, the results show that the diffuser is capable of giving a good performance and having a decreased boundary layer thickness. | ||||
| Keywords | ||||
| greenhouse; adaptation; Separation; impedance; porosity; pressure recovery coefficient; boundary layer thickness | ||||
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