| 摘要 |
A snow gun in the form of a hollow body includes a radially outer cylindrical wall having a longitudinally adjustable central tube coaxially mounted within the hollow body which further includes a radially inner cylindrical wall, radially spaced from the radially outer cylindrical wall and from the central tube. The outer cylindrical wall terminates in a converging, diverging nozzle downstream of facing ends of the radially inner cylindrical wall and the central tube. The end of the radially inner cylindrical wall proximate to the expansion nozzle forms a conical portion which extends beyond the axial end of the central tube to form a second converging and diverging expansion nozzle for a water passage between the central tube of the radially inner cylindrical wall. Compressed air is fed to the interior of the central tube and between the radially outer and radially inner cylindrical walls. Water under pressure is supplied to the annular passage defined by the central tube and the radially inner cylindrical wall. Swirl vanes are provided interiorally of the central tube and intermediate of the radially inner and radially outer cylindrical walls. Compressed air flows impact on a hollow jet of water exiting the second expansion nozzle to induce rotational shear forces in addition to longitudinal shear forces therebetween.
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