Abstract
Measured values of the hydraulic discharge coefficient and the critical mass flowrate are presented. Experiments have been carried out on three Laval nozzles over the following range of flow operating parameters at the inlet of the nozzle: pressure—4 and 8 MPa; water subcooling—from 0 to 50°C; quality of the two-phase mixture—from 0 to 1; and steam superheating—from 0 to 30°C. Transversal injection causes a maximum decrease (30–40%) in the critical mass flowrate at the point corresponding to the discharge of saturated water. Transition from discrete holes to an annular slot in the side wall leads to some increase (up to ∼ 10%) in the critical mass flowrate, while the hydraulic discharge coefficient remains practically constant. The increase in width of the annular slot from 2.57 to 4.59 mm does not cause any systematic change in the transversal injection efficiency. A decrease in length of the cylindrical throat from 156 to 5 mm leads to an increase (∼ 12–20%) in the transversal injection efficiency and to a decrease (∼ 7–12%) in the hydraulic discharge coefficient.
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