Near-field turbulence properties of single- and two-stream plane mixing layers
✍ Scribed by R. D. Mehta; R. V. Westphal
- Publisher
- Springer
- Year
- 1986
- Tongue
- English
- Weight
- 877 KB
- Volume
- 4
- Category
- Article
- ISSN
- 0723-4864
No coin nor oath required. For personal study only.
✦ Synopsis
Detailed mean flow and turbulence measurements have been made in the near-field of two plane mixing layers in air with a maximum velocity of 21 m/s. The experimental rig enabled mixing layers of velocity ratios 0 and 0.46 to be generated simultaneously. Cases with both tripped and untripped initial boundary layers were studied. In all cases, it was found that the two-stream layer developed to the self-preserving state in a distance much shorter than the single-stream layer, which followed accepted criteria for the development distance. The asymptotic levels of the turbulence quantities in the two-stream layer and the development of the single-stream layer showed agreement with existing data. The results suggest that the two-stream mixing layer should provide a better test case for the development of turbulence models and calculation methods than the single-stream mixing layer. ' (prime) fluctuating component (e.g. u = U + u') -(overbar) time-averaged quantity