<div class="description">
<p>Loss measurements were conducted using a five-hole conical pneumatic
probe in a subsonic wind tunnel containing a modeled cascade of controlled
diffusion (CD) stator blades. Following reference measurements at high
incidence one blade was modified (slotted at the leading edge) in an
attempt to (passively) reduce the size of the leading edge separation
bubble and thereby improve performance. Prior to the surveys, the acquisition and reduction software was modified to provide loss calculations
using both mass-averaged and fully-mixed-out conditions for the upstream
and downstream flows. Results showed that the mass-averaged method provided the more consistent results, and this was explained. The slotted
leading edge blade was found to produce less loss than the reference
blade, and it was concluded that the control concept should be explored
in more detail.
</p>
<br>Subjects: Cascade Wind Tunnel Loss Measurement; Controlled DIffusion Blading; Slotting Leading Edge</div>
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Armstrong, Jeffrey H.</div>
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