Heat transfer in a two-pass internally ribbed turbine blade coolant channel with cylindrical vortex generators
- Louisiana State Univ., Baton Rouge, LA (United States); and others
The effect of vortex generators on the mass (heat) transfer from the ribbed passage of a two pass turbine blade coolant channel is investigated with the intent of optimizing the vortex generator geometry so that significant enhancements in mass/heat transfer can be achieved. In the experimental configuration considered, ribs are mounted on two opposite walls; all four walls along each pass are active and have mass transfer from their surfaces but the ribs are non-participating. Mass transfer measurements, in the form of Sherwood number ratios, are made along the centerline and in selected inter-rib modules. Results are presented for Reynolds number in the range of 5,000 to 40,000, pitch to rib height ratios of 10.5 and 21, and vortex generator-rib spacing to rib height ratios of 0.55, and 1.5. Centerline and spanwise averaged Sherwood number ratios are presented along with contours of the Sherwood number ratios. Results indicate that the vortex generators induce substantial increases in the local mass transfer rates, particularly along the side walls, and modest increases in the average mass transfer rates. The vortex generators have the effect of making the inter-rib profiles along the ribbed walls more uniform. Along the side walls, horse-shoe vortices that characterize the vortex generator wake are associated with significant mass transfer enhancements. The wake effects and the levels of enhancement decrease somewhat with increasing Reynolds number and decreasing pitch.
- Research Organization:
- Clemson Univ., SC (United States). Energy Research Center
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FC21-92MC29061
- OSTI ID:
- 219515
- Report Number(s):
- DOE/MC/29061-96/C0664; CONF-9510109-36; ON: DE96008946; TRN: 96:002605
- Resource Relation:
- Conference: Advanced turbine systems (ATS) annual review, Morgantown, WV (United States), 17-18 Oct 1995; Other Information: PBD: 1995
- Country of Publication:
- United States
- Language:
- English
Similar Records
Heat transfer in a two-pass internally ribbed turbine blade coolant channel with cylindrical vortex generators
Local heat/mass transfer distributions around sharp 180 deg turns in two-pass smooth and rib-roughened channels