A nozzle sacrifices pressure for speed. The speed of the water does the cleaning. Nozzle pressure refers to the pressure energy supplied by a high-pressure pump that is converted into kinetic energy, affecting the stability of the thin film produced by the nozzle and the resulting particle size during atomization. Pressure is critical to nozzle performance. Reducing hydraulic pressure reduces nozzle flow, increases the average droplet size, and generally reduces the angle of the spray fan.
The increase in pressure increases the flow of the nozzle, reduces the average droplet size, and generally increases the angle of the spray fan. The pressure drop of the nozzle, respectively, is 15, 20, 25, 30 MPa, which is the inlet pressure of the nozzle when 20, 25, 30, 35 MPa are taken. The relative increase in the pressure drop of the nozzle is the same as that of pressurization in the orifice (Table 3).,. The nozzle diameter of Φ4.5 mm was used to analyze the flow field in the well using hydraulic injection fracturing at a well depth of 700 mm, an inlet pressure of 25 MPa and an annular confinement pressure of 5.0 MPa.
The physics behind pressure conversion follows Bernoulli's principle, according to which pressure energy is transformed into kinetic energy as water accelerates through the restricted opening of the nozzle. In addition, the quantitative analysis indicates that the increase in axial pressure is consistent with the increase in the nozzle pressure drop by the same value. The pressure of the nozzle hinge-type electrohydraulic servo valve that meets the design criteria is 20 to 100% of the oil supply pressure. Only the nozzle diameter, the nozzle number and the nozzle pressure drop are determined; other relevant parameters, such as flow rate and surface pressure, can be calculated.
Therefore, the axial pressure and velocity of the SC-CO2 jet with different pressure drops in the nozzle were studied. Jet pressurization is essentially the conversion of the kinetic energy of the fluid at high velocity at the nozzle outlet to the hydrostatic pressure of the fluid in the drill channel. Pressure distribution refers to the degree of uniform or uneven distribution of pressure exerted by a nozzle jet on the target surface.
