Turbulence and Complex Flow Phenomena in Multi-Stage Axial Turbomachines
Abstract
The objective of this project is to measure the flow within axial turbomachines and use the data to address turbulence modeling issues. Measurements are performed in two-stage transparent machines located in an optically index matched facility, which allows unobstructed 2-D and Stereo PIV measurements. Data provide insight on blade-wake, wake- boundary layer and wake-wake interactions. This report examines and elucidates several phenomena: i. Variations in turbulence within a wake generated by an upstream IGV blade while being ingested by a rotor passage; ii. Non-uniform turbulence production and diffusion leading to formation of turbulent hot spots within a rotor wake due to flow non-uniformities generated by upstream wakes; iii. Unsteady flow caused by an upstream wake stabilizes the boundary layer on a rotor blade and reduces its momentum thickness; iv. Comparisons of data covering an entire stage to RANS predictions; and V. Measurements of subgrid-scale stresses and dissipation rate, and comparisons to model predictions as well as associated implications of spatial averaging in followed by ensemble averaging in sustially non-uniform flows.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 10, 2007
- Accession Number
- ADA468816
Entities
People
- Charles Meneveau
- Joseph Katz
Organizations
- Johns Hopkins University