Skip to main content Accessibility help

Developing an Application for Refractory Open Cell Metal Foams in Jet Engines

  • Wassim E. Azzi (a1), William L. Roberts (a1) and Afsaneh Rabiei (a1)


The thermodynamic efficiency of the Brayton cycle, upon which all gas turbines (aeropropulsion and power generation) are based on scales with the peak operating temperature. However, the peak temperature is limited by the turbine blades and the temperature they can withstand. The highest temperatures in the gas turbine occur in the combustor region but these temperatures are often too high for turbine blades. As a result, the combustion products must be diluted with relatively cooler air from the compressor to reduce the temperature to tolerable levels for the turbine blades. This research suggests placing a ring of high temperature open cell metal foam between the combustors and turbine sections of the jet engine to mix and average the difference in temperatures resulting from the cooling schemes in combustor cans. Temperature mixing effect was tested using a special setup with the application of an infrared camera and streams of hot and cold air passing through the foam. High speed flow pressure drop around Mach 1 (340 m/s) was done on the same foam samples to understand pressure drop in the compressible regime of air. Infrared imaging showed that open cell metal foams successfully mixed and averaged the difference in temperatures of the hot and cold gasses thus creating a more uniform temperature profile while pressure drop testing revealed that open cell metal foams result in minimal pressure drop at high flows especially when the increase in temperature in taken into consideration.


Corresponding author

* Corresponding Author


Hide All
1. Dimiduk, D. M., & Perepezk, J. H., MRS Bulletin, 28 (9), 639645 (2003)
2. Di Mare, F., Jones, W. P., & Menzies, K. R., Combustion and Flame, 137, 278294, (2004)
3. ERG Materials and Aerospace Corporation, Oakland, CA,
4. Porvair plc,
5. Boomsma, K., Poulikakos, D., & Ventikos, Y. Int. J. Heat & Mass Trans., 24, 825834, (2003)
6. Boomsma, K., Poulikakos, D., & Zwick, F., Mech. Of Mat., 35, 11611176, (2003)
7. Lu, T. J., Stone, H. A., & Ashby, M. F., Acta Mater., 46, 36193635, (1998)
8. Ashby, M. F., Evans, A., Fleck, N. A., Gibson, L. J., Hutchinson, J. W., & Wadley, H. N. G. Metal Foams: A Design Guide, (Butterworth-Heinmann, Massachusetts, 2000)
9. Mattingly, J.D., Elements of Gas Turbine Propulsion, (McGraw-Hill, New York 1996)
10. Gibson, L. J., & Ashby, M. F. Cellular Solids-2nd Edition, (Cambridge University Press New York, 1997)
11. Queheillalt, D. T., Katsuma, Y., & Wadley, H. N. G., Scripta Mater., 50, 313317, (2004)

Developing an Application for Refractory Open Cell Metal Foams in Jet Engines

  • Wassim E. Azzi (a1), William L. Roberts (a1) and Afsaneh Rabiei (a1)


Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed