| 摘要 |
An apparatus suitable for controlling vegetation which apparatus comprises a hot-liquid container (28, fig 1), release means (38, fig 2) connected to the hot-liquid container and at least one nozzle assembly 100, for applying a stream of foam that contains steam, connected to the container through the release means. The nozzle assembly includes a shroud 102 defining an enclosure around a spraying duct 104 within which are a flow-restricting aperture 113, a primary mixing chamber 114 and a secondary mixing chamber 116 linked by a duct of varying cross-section, and with a turbulence-enhancing structure 124 at an outlet 134 from the secondary mixing chamber. Inlet holes 118 communicate between the primary mixing chamber and the enclosure, so air and steam are sucked into the water stream, and foam is produced. The apparatus is either propelled by or mounted on a vehicle; and during use of the apparatus to control vegetation the vehicle provides power (24, fig 1) to the heating means.
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