Predicting the optical quality of supersonic shear layers (original) (raw)

1988

Abstract

A thin-shear-layer computational method and semiempirical model for optical degradation were used to assess the optical quality of four different supersonic shear layers. The shear layers were designed to represent the mixing layer formed between the high-speed stream of an aerowindow and a low-speed atmospheric stream. The mixing layers differed only in window gas composition (Ar, N2, He, 0.62 He/0.38 Ar). Predicted time-averaged quantities were used in the semiempirical correlation to predict optical quality. While the predictions reproduce the ranking of the optical quality of the gases seen experimentally, an absolute comparison with the measured optical degradation was less than satisfactory. Differences between the predictions and measurements are discussed and an adjustment to the correlation constant which greatly enhanced agreement is described.

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