A Film Cooling Experiment on a Convergent-Divergent Nozzle

摘要

A stainless steel, supersonic nozzle with an 11/16-in.-dian throat was successfully cooled using only a tangential air film. Mass fractions of cooling air film ranged from 0.190 to 0.302, and the maximum recorded wall temperature was 1800F. Stilling chamber pressures ranged from 482 to 577 psia and temperatures from 2615 to 3460F. Measured wall temperatures showed only limited agreement with a newly developed theory, with the theory underestimating adiabatic wall temperatures by from 20 to 30 percent. (Author)