A venturi device for stable addition of foaming agent to self-suction
liquid at high flow rates
Abstract
:To achieve a stable addition of foaming agent under high flow
rates, an independently designed Venturi structure with self-suction of
liquid and foaming agent was numerically simulated. We simulated the
effects of different suction structure diameters, contraction angles,
throat length and position on the suction ratio, compared and analyzed
the data, and determined the optimal suction structure parameters. The
suction ratio stabilizes and then decreases as the outlet pressure
increases. At an outlet pressure of 0.48 MPa, the suction ratio remains
stable at 1.14%. However, as the outlet pressure increases, the ability
of the Venturi structure to add foaming agent to the self-suction liquid
decreases under high flow rates, causing the suction ratio to rapidly
decrease to a minimum value of 0.55 MPa. The suction ratio shows a
tendency to first stabilize and then decrease as the outlet pressure
increases. When the outlet pressure reaches 0.48 MPa, the suction ratio
can remain stable at 1.14%; as the outlet pressure increases, the
addition ability of the Venturi structure with foaming agent added to
the self-suction liquid under high flow rate decreases, and the suction
ratio rapidly decreases to a minimum value of 0.55 MPa. We have
conducted a detailed analysis of the process and flow field of liquid
suction. As the pressure ratio increases, the high-speed area of the
throat gradually shrinks, and the flow field in the diffusion section
fluctuates. When the outlet pressure is 0.6 MPa and the velocity field
shifts towards the upper part of the diffusion section, the cavitation
area will gradually disappear and lose its liquid suction ability.