Abstract
Flow visualization of gas flows in sharp 180-degree turn of a square cross-section duct was conducted using paraffin mist as a tracer. The flow in such a sharp turning duct is characteristic to the cooling passages in gas turbine blades. Visualized results were recorded using both video and 35-mm still cameras. Whole flow structure in the test section was visualized for the Reynolds number between 300 and 900.It was disclosed that there exists a large scale 3-dimensional flow structure accompanied by a strong reverse flow along the surface of outer corner.
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