Directly behind the nozzle outlet begins the tapered core zone, in which the maximum velocity v₀ of the velocity profile in the flow cross-section from x = 0 in the jet axis up to x = x₀ remains almost constant. I.e., that at the cone point of the core jet the maximum pressure in the jet axis still is identical to the jet outlet pressure at the nozzle. In this area, the jet is still so compact that there is hardly any mixing with air.

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