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Physical model of angle nozzle was established. Based on the CFD software of FLUENT, the flow field about cavitating water jet in angle nozzle was simulated by use of mixture model, Singhal complete cavitation model, RNG turbulent model and SIMPLEC algorithm. The simulation results show that there are two low pressure regions and two regions of high volume fraction of steam in angle nozzle. The region of high volume fraction of steam corresponds with low pressure region. The region of high volume fraction of steam mainly lies near the exit of column section and approximates to a semicircle. In this region, the volume fraction of steam reaches the maximum value at a point of on-wall. Taking that point as the centre, the volume fraction of steam decreases gradually from interior to exterior.

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