Abstract
A test program was designed and conducted to investigate and understand the flow in the compressorheat exchanger portion (Back-Leg) of the National Wind Tunnel Complex (NWTC) Transonic Wind Tunnel. A 1/23 scale model of the Back-Leg was constructed, commissioned and testing was completed in a seven month period starting in the fall of 1995. The results showed that the diffuser system originally designed for the Transonic Wind Tunnel performed poorly with unsteady boundary layer behavior in the conical diffuser and intermittent separation in the wideangle diffuser. The flow uniformity and steadiness were improved considerably by installing two 51% open-area ratio screens in the wide-angle diffuser. The flow quality was further improved by installing a coarse grid in the conical diffuser. These data should be a useful baseline for future testing and for computer simulations of full-scale designs. This paper contains some selected results from this study; a full account of the investigation is given in Yaste et al. '.
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