Unsteady Wake Over a Linear Turbine Blade Cascade With Air and CO2 Film Injection: Part I—Effect on Heat Transfer Coefficients | Zendy

S. Ou | Zendy; J. C. Han | Zendy; A. B. Mehendale | Zendy; C. P. Lee | Zendy

Open Access

Unsteady Wake Over a Linear Turbine Blade Cascade With Air and CO2 Film Injection: Part I—Effect on Heat Transfer Coefficients

Author(s) -

S. Ou,

J. C. Han,

A. B. Mehendale,

C. P. Lee

Publication year - 1994

Publication title -

journal of turbomachinery

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.972

H-Index - 112

eISSN - 1528-8900

pISSN - 0889-504X

DOI - 10.1115/1.2929465

Subject(s) - nusselt number , wake , mechanics , strouhal number , reynolds number , freestream , heat transfer , materials science , airfoil , physics , thermodynamics , turbulence

The effect of unsteady wake flow and air (D.R. = 1.0) or CO 2 (D.R. = 1.52) film injection on blade heat transfer coefficients was experimentally determined. a spoked wheel-type wake generator produced the unsteady wake. Experiments were performed on a five-airfoil linear cascade in a low-speed wind tunnel at the chord Reynolds number of 3 × 10 5 for the no-wake case and at the wake Strouhal numbers of 0.1 and 0.3. Results from a blade with three rows of film holes in the leading edge region and two rows each on the pressure and suction surfaces show that the Nusselt numbers are much higher than those for the blade without film holes. On a large portion of the blade, the Nusselt numbers «without wake but with film injection» are much higher than for «with wake but no film holes»

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