Accession Number:

ADA393055

Title:

Application of Large Eddy Simulation to Cooling and Flow Problems in Aeropropulsion Systems

Descriptive Note:

Final rept Apr-Nov 2000

Corporate Author:

IOWA STATE UNIV AMES DEPT OF MECHANICAL ENGINEERING

Personal Author(s):

Report Date:

2001-06-19

Pagination or Media Count:

21.0

Abstract:

The objective of this research was to expand the capabilities of large eddy simulation technology to contribute to the solution of urgent problems in propulsion systems and to contribute to the physical understanding of such flows. Work was initiated on both external and internal cooling flows in turbines. Results on the effects of rotation on heat transfer in channel flow are reported for heating and cooling rates of magnitudes large enough to cause significant variation in temperature dependent fluid properties. The effect of rotation was to reduce the turbulent transport near the leading wall and increase it near the trailing wall. The effect was larger for the heating flows than for the cooling flow. The ratio of Nusselt numbers on the two walls ranged between two and five, whereas the friction coefficients at the trailing wall were about twice as large as those at the leading wall. The magnitudes of streamwise and spanwise velocity fluctuations were observed to differ by about a factor of two near the two walls.

Subject Categories:

  • Computer Programming and Software
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE