Finite - Di erence Solution for Laminar or Turbulent Boundary Layer Flow Over Axisymmetric Bodies With Ideal Gas , CF 4 , or Equilibrium Air Chemistry

A computer code has been developed that uses an implicit nitedi erence technique to solve nonsimilar, axisymmetric boundary layer equations for both laminar and turbulent ow. The code can treat ideal gases, air in chemical equilibrium, and carbon tetra uoride (CF4), which is a useful test gas for hypersonic blunt-body simulations. This is the only known boundary layer code that can treat CF4. Comparisons with experimental data have demonstrated that accurate solutions are obtained. The method should prove useful as an analysis tool for comparing calculations with wind tunnel experiments and for making calculations about ight vehicles where equilibrium air chemistry assumptions are valid.