0

Full Content is available to subscribers

Subscribe/Learn More  >

Thermo-Fluiddynamic Numerical Simulation and Entropy Generation Maps of an Ultra-Micro-Turbogas Compressor Wheel

[+] Author Affiliations
Giovanni Pierandrei, Enrico Sciubba

Uniroma1-La Sapienza, Roma, Italy

Paper No. IMECE2010-37178, pp. 355-362; 8 pages
doi:10.1115/IMECE2010-37178
From:
  • ASME 2010 International Mechanical Engineering Congress and Exposition
  • Volume 10: Micro and Nano Systems
  • Vancouver, British Columbia, Canada, November 12–18, 2010
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4447-2
  • Copyright © 2010 by ASME

abstract

The present study was designed to gain deeper insight of the thermofluiddynamic fields in a compressor wheel. The compressor is part of an ultra-micro-turbogroup developed by the University of Roma 1, co-funded within the frame of a National Research Project, conceived as a portable energy conversion system delivering electricity to a broad range of small devices, for medical, military or emergency use. The expected electrical power output is 400 watts. The turbogroup, fuelled by natural gas, has a single-shaft configuration and is coupled with a reversible electric motor-generator, granting a more compact overall system, encapsulated in a relatively small self-contained assembly. The compressor wheel has an outlet diameter of 38 mm, spins at 175,000 rpm and delivers the fluid to the vaneless diffuser endowed with a static pressure of 155 kPa. The mass flow rate is 0.02 kg/s, and the total inlet temperature is 300 K and the total temperature of the flowing out fluid is about 400 K. The rotor, featuring 6 full- and 6 splitter blades, is coupled with a vaneless diffuser followed by a toroidal volute that collects the almost purely radial fluid at diffuser exit and delivers it to the regenerator. The numerical simulation based upon the k-ε turbulent model has been run within the commercial software Fluent® , on a very fine mesh constructed on a geometry obtained from a commercial turbocharger manufacturer. A critical analysis has been performed on the turbulent structures that evolve within the rotor channel, to better understand the dissipative mechanisms. To this goal, the thermal and viscous entropy generation rate, have been computed on the converged solution of the thermal-fluiddynamic field, and their maps have been inspected to study the development of turbulent structures. The results of this study confirm that an accurate analysis of the local entropy generation rates provides useful hints on how to introduce design improvements and to achieve a higher stage efficiency.

Copyright © 2010 by ASME

Figures

Tables

Interactive Graphics

Video

Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In