Heat Transfer to a Vaporizing, Ablating Surface

Abstract

must be found. In the simple case of separation ahead of a step, the reattachment point is fixed, and the oblique-shock theory gives the required second relation between separation-point location and pressure rise. For most other problems, however, the reattachment point is not known. It is, therefore, necessary to find a relationship between reattachment-point location and pressure rise at reattachment. Further experimental work is needed to define such a relation. An expression similar to the present semiempirical relation has been proposed by Guman. His expression, however, uses a Reynolds Number based on the distance to the point where the disturbance would intersect the boundary layer if there were no interaction. It, therefore, gives the pressure rise for given flow conditions directly without requiring local expressions for separation-point or reattachment-point locations. An empirical constant is used to fit the equation to experimental data for a given body shape. Guman's equation can be written