Experimental determination of the force axis of a high-pressure water jet
Abstract
Considering individual elements of high-pressure jets as a free-falling body thrown into space with a certain velocity, and having the parameters of the jet trajectory, it is possible to judge the amount of energy transferred by the jet to each of the sections under consideration, as well as the losses to overcome the resistance of the medium. But the determination of the trajectory parameters of the force axis of the jet is complicated by a number of features inherent in high-pressure jets. For example, at a pressure of 200 ati, a jet with a diameter of 3 mm passes the most effective zone with a length of 6 m for 0.03 sec, while in a vacuum it would fall by 4.4 mm. Under these conditions, a method with a high degree of accuracy in determining the position in space of the force axis of the high-pressure jet is needed. Determination of the altitude coordinate by visual observation is completely unacceptable, since the halo of spray surrounding and hiding the main central part of the jet has a lower velocity, and hence a greater curvature of the trajectory. The method of jet core prints does not provide the accuracy required in these conditions and requires labor‑intensive preparation and processing of jet prints.
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