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On Mutual Deflection for the Radial Rotating Jet Pressure Exchange Mechanism

[+] Author Affiliations
Muhammad Umar

Center of Excellence in Science and Applied Technologies, Islamabad, Pakistan

Charles A. Garris

The George Washington University, Washington, DC

Paper No. IMECE2009-12836, pp. 935-942; 8 pages
doi:10.1115/IMECE2009-12836
From:
  • ASME 2009 International Mechanical Engineering Congress and Exposition
  • Volume 9: Heat Transfer, Fluid Flows, and Thermal Systems, Parts A, B and C
  • Lake Buena Vista, Florida, USA, November 13–19, 2009
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4382-6 | eISBN: 978-0-7918-3863-1
  • Copyright © 2009 by ASME

abstract

The “Pressure exchange” is a novel concept in turbomachinery whereby two fluids, at different energy levels, come in direct contact with each other to transfer energy and momentum between them through non-steady interface pressure forces. The rotating jets of the high pressure primary fluid, often referred to as pseudoblades, resemble solid blades on the impeller of a conventional turbomachine. The low pressure secondary fluid, ahead of the pseudoblades, is pressurized by the action of interface pressure forces. The current paper seeks to provide an insight into the complex flow phenomena occurring inside the radial flow pressure exchange ejector. The primary mechanisms controlling the process are pressure exchange and mixing. The angular deviation, between an actual pseudoblade and the pseudoblade with no secondary fluid, was calculated for the first time. The results revealed that the angular deviation is small in the near field, where pressure exchange dominates, and becomes larger in the far field as the mixing layer tends to grow. If this new concept is shown to be viable for gas compression at sufficiently high pressure ratios, then, in refrigeration applications, it would enable environmentally benign refrigerants to replace the harmful chlorofluorocarbons (CFC) and reduce the effluence of greenhouse gases. Applications in many other areas, where conventional ejectors are currently used, are also possible.

Copyright © 2009 by ASME

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