C.P. No. i335 PROCUREMENT EXECUTIVE, MINISTRY OF DEFENCE AERONAUTICAL RESEARCH COUNCIL CURRENT PAPERS Measurements of Secondary Loss in a Model Turbine with Variable Inlet Boundary Layer
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چکیده
SUMMARY Detailed measurements have been made of the casing boundary layer flow before and after the nozzle blades of a single stage model air turbine. The measurements were made with the natural casing inlet boundary layer and two artificially thickened boundary layers. The results differ considerably from those usually obtained in two dimensional cascades. There was no sign of the usual secondary loss core and for the thick boundary layers the circumferentially averaged total pressure increased along stream surfaces near to the casing, this implies a negative secondary loss. The explanation appears to be that low energy fluid from the upstream casing boundary layer is transported radially inwards along the blade surface or wake and is discharged into the mainstream over the whole of the blade span.
منابع مشابه
MINISTRY OF DEFENCE (PROCUREMENT EXECUTIVE) AERONAUTICAL RESEARCH COUNCIL CURRENT PAPERS The Calculation of Compressible Turbulent Boundary Layers with Fluid Injection
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