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A study was carried out on the influence of cavitation on the internal flow and the macroscopic behaviour of the spray in Diesel injection nozzles. For this study, two bi-orifice nozzles were used, one cylindrical, and the other convergent (conical). From the point of view of cavitation, the two chosen nozzles are very different, as the first nozzle is much more inclined to cavitate, whereas the second nozzle inhibits the cavitation phenomenon. First, in order to find the exact internal geometry of the two nozzles, a non-destructive characterisation method is used, which is based on the creation of silicone moulds. Once the nozzles are characterised dimensionally, a hydraulic characterisation is made. The results of this hydraulic characterisation, together with the predetermined dimensional characterisation, enable the discharge coefficient and the critical cavitation conditions to be determined. By identifying the critical …