Modeling Aero Optics Effects in Jets

摘要

Optical radiation passing through compressible turbulent shear layer is distorted due to fluctuations in the index of refraction. Most of the known data comes from measurement of the optical phase change. Knowledge of the fluctuating density field within the shear layer enables us to calculate the optical distortions. In the present work, a series of models are presented with different type of complexity. All the expressions presented are dependent on the turbulent kinetic energy and dissipation rate calculated by CFD codes. Calculations based on the models are compared with available experimental results. Some examples of application to aero-optics are given.