| Nozzle, a very important part in high-pressure water-jet equipment, influences the other parts of the jet system. An appropriate nozzle will obviously enhance the jet efficiency. There are many kinds of nozzles, among which the needle-shape nozzle is widely used in practice. Recently, with the jet research and development, the non-circle jet nozzle is used widely begin to be accepted because of its advantages.In this thesis, experimental studies on the non-circle nozzles (triangle and quadrangle types) have been conducted, and the experimental results are compared with these of the needle-shape nozzle. The experimental results all agree well with those of the theoretical analysis. The water-jet parameters include volume flow rate of the water-jet (q), discharge coefficient of orifice (μ), output power (Pjet),and impinging force (F). In addition, the experimental study on the shape of non-circle nozzle's jet is performed, and the jet-structure form non-circle nozzle has good stable characteristics compared with that from the needle-shape nozzle. The result would be of benefit to the extending application of the non-circle nozzle.Some experimental results are valuable: the non-circle nozzle's (triangle and quadrangle) discharge coefficient of orifice and the shape of jet are better then those of the needle-shape nozzle, indicating that the non-circle nozzle is more efficient, and hence the nozzles could be used the cutting or perforating. It is a beneficial investigation in order to apply them in industries. The conclusion acquired in this thesis about the non-circle nozzle is important either in theory or engineering application.
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