초록 ▼

A method and apparatus for providing an aero-optical interface by stabilizing a shear layer in a fluid flowing over an aperture. The apparatus extracts fluid from a remote part of the flowing fluid and conveys it to the underside of the shear layer where it feeds the shear layer and prevents the she

A method and apparatus for providing an aero-optical interface by stabilizing a shear layer in a fluid flowing over an aperture. The apparatus extracts fluid from a remote part of the flowing fluid and conveys it to the underside of the shear layer where it feeds the shear layer and prevents the shear layer from deflecting into the cavity underlying the aperture. A preferred embodiment also includes a ramp downstream of the aperture. Stability of the shear layer is optimized by placing the aperture where the pressure distribution absent the aperture would have been constant. The resulting thin, self-similar shear layer is an optimized viscid flowfield interface for uniform transmission of optical radiation.

대표청구항 ▼

An apparatus for controlling a shear layer to optimize transmission of optical radiation therethrough comprising: a surface having an aperture therethrough, said shear layer formed by fluid passing over one side of said surface and said aperture; a cavity region positioned on the other side of said

An apparatus for controlling a shear layer to optimize transmission of optical radiation therethrough comprising: a surface having an aperture therethrough, said shear layer formed by fluid passing over one side of said surface and said aperture; a cavity region positioned on the other side of said surface, said cavity region including said aperture; means at least partially positioned within said cavity for at least one of (1) receiving said optical radiation from outside said cavity and (2) transmitting said optical radiation to the exterior of said cavity; fluid intake means for directing fluid other than that passing over said aperture to pass into said cavity; and smoothing means positioned between said fluid intake means and said aperture for causing fluid flowing to said aperture to be uniform and free of flow channels and turbulence.