| 摘要 |
An exhaust hood (125, 225, 325, 425) captures and contains a thermal plume (170, 370, 470) with a minimum of exhaust air by defining a short-throw vertical curtain jet (150, 350, 453) around a protected perimeter. The jet augments the formation of a vortex (135, 335) within the hood which extends beyond the hood protected by the curtain jet. The effect is the extension of the buffer volume of the hood recess. This reduces the fluid strain that generates the turbulent eddies that cause breach of containment. Also, the curtain jet augments the vortical flow which is stable and contains less fluid strain than would otherwise occur. The hood recess is shaped to assist in defining the above vortex in terms of both its shape and its size. For example, the recess may be made smooth-walled according to an aspect of the invention.
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