1. Boundary-Layer Displacement and Leading-Edge Bluntness Effects in High-Temperature Hypersonic Flow
2. THE BLUNT-LEADING-EDGE PROBLEM IN HYPERSONIC FLOW
3. Experimental Equipment and Procedures
4. A l-in.diam brass rod was used for the main body of the thermal conductivity test cell and for threaded caps at either end. An axial hole 0.200 - 0.0015 in. in diameter and 8 in. long was drilled to provide the desired internal geometry of the cell. End caps were sealed with teflon gaskets. The brass rod was machined in such a manner that a flat area was preserved tangent to the axial hole at either end. Tefloninsulated positioning plates were mounted on these flat areas to permit accurate location of a platinum wire filament of 0.001 in. diam coincident with the hole axis. From each positioning plate, an electrical lead was carried to its exit point through an epoxy seal. At the exit point, each lead was conducted through a glass tube to prevent contact with the water bath; preliminary experiments had shown that electrically hot leads in contact with even distilled water can produce large galvanic effects. The brass end cap at the upper end of the cell was soldered to a If-in. length of stainless steel tubing that connected with the gas system. All brass components were gold plated to minimize chemical corrosion. The platinum filament was calibrated by measuring its initial resistance to the passage of direct current when it was immersed in distilled water at measured temperatures.