Study of local heat/mass transfer distributions in multipass channels for turbine blade cooling

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1987

OSTI ID:6474665

Chandra, P R

The heat transfer and friction characteristics of turbulent air flow in a two-pass square channel were experimentally investigated via the naphthalene sublimation technique. The test section, which consists of two straight square channels joined by a sharp 180/sup 0/ turn, simulates the internal cooling passages of gas-turbine airfoils. The top and bottom surfaces of the test channel were roughened by rib turbulators. The effects of Reynolds number (between 10,000 and 60,000), rib pitch-to-height ratio (P/e = 10 and 20), rib height-to-hydraulic diameter ratio (e/D = 0.063 and 0.094) and rib angle-of-attack (..cap alpha.. = 90/sup 0/, 60/sup 0/ and 45/sup 0/) were studied. The local heat transfer coefficients were measured both on the ribbed side walls and on the smooth side walls along the channel. The friction factors in the before-turn, in-turn, and after-turn regions were also calculated. Average Sherwood number ratios and average friction results were correlated and compared with the published heat transfer and pressure drop data.

• Research Organization: Texas A and M Univ., College Station (USA)
• OSTI ID: 6474665
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
AIRFOILS
ENERGY TRANSFER
ENGINES
FLUID FLOW
GAS TURBINE ENGINES
HEAT ENGINES
HEAT TRANSFER
INTERNAL COMBUSTION ENGINES
MASS TRANSFER
PRESSURE DROP
REYNOLDS NUMBER
SIMULATION
TURBULENT FLOW