NUMERICAL AND EXPERIMENTAL INVESTIGATION OF COMPRESSIBLE FLOW EJECTORS | ||||
| ERJ. Engineering Research Journal | ||||
| Article 7, Volume 30, Issue 1, January 2007, Page 53-66 PDF (534.76 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/erjm.2007.69897 | ||||
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| Authors | ||||
| N. I. I. Hewedy1; Mofreh H. Hamed1; F. Sh. Abou-TaIeb1; Tarek A. Ghonim2 | ||||
| 1Mechanical Power Engineering Department Faculty of Engineering, Menoujya University, Shebin EL-Kom, Egypf | ||||
| 2Mechanical Power Engineering Department Faculty of Engineering, Menoujya University, Shebin EL-Kom, Egyp | ||||
| Abstract | ||||
| The present work deals with numerical and experimental investigation of supersonic air-air ejectors. The numerical investigation is based on flow equations governing turbulent, compressible, two-dimensional, steady, time averaged and boundary layer equations. These equations are continuity, momentum and energy. In addition, turbulent shear stress and heat transfer are calculated using eddy viscosity model. These equations are solved iteratively using finite difference method under the conditions of different flow regimes which can be divided into several distinctive regions where, the methods for estimating the mixing length are different for each flow region. The first region depicts the wall boundary layer, jet shear layer and secondary and primary potential flow. Tlle second one contains a single region of developing flow. The present results are concerned with the static pressure coefficient, temperature and velocity distributions along the mixing duct and diffuser. Also the overall efficiency of the ejectors for different flow conditions such as, motive air stagnation pressure and temperature, secondary air temperature and mass ratio is calculated. A simple ejector with convergent-divergent primary nozzle was fabricated and experimentally tested. The present theoretical and experimental results are compared with published data. This comparison shows a good agreement. The results obtained help to understand the flow behavior and physical phenomena occurring in the flow through ejectors. | ||||
| Keywords | ||||
| supersonic flow; two-dimensional flow; turbulent and heat transfer; ejectors | ||||
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