A Method for Determining the Boundary Streamlines of Slit Spouts for Building Wide and Thin Water Curtains

Abstract

The invention discloses a method for determining the boundary streamline of a gap spout for building a wide and thin water curtain. The present invention mainly analyzes the streamlined gap spout model based on the planar potential flow theory of fluid mechanics, regards the water flow from the parallel section A of the spout inlet entering the constriction section B as the composite flow of parallel plane flow and point sink, and connects the constriction section B to the spout exit The flow is regarded as the synthetic flow of point sink and parallel plane flow, and the specific potential function and flow function are established, and the streamline boundary equation is derived. The method for determining the boundary streamlines of the gap spouts for building wide and thin water curtains provided by the present invention designs streamlined gap spout boundary streamlines, reduces the flow resistance loss of the gap spouts and optimizes the internal flow field, in particular, homogenizes the outlet velocity distribution.

Description

technical field [0001] The invention belongs to the technical field of air purification and its fluid machinery, and in particular relates to a method for determining the streamline of a gap spout boundary for building a wide and thin water curtain. Background technique [0002] Water curtain dust removal is a specific implementation of wet dust removal technology. It adopts the method of ventilating and purifying the water curtain, and the dusty airflow is mixed with the water curtain to achieve the air purification effect of water curtain dust removal. The mechanism of water curtain dust removal mainly involves inertial collision and contact blocking flow. The formation of traditional water curtains mainly relies on the assistance of gauze. Therefore, the efficiency of water curtain formation and coverage is low, and the gauze blocking the roadway will affect on-site operations. [0003] Slit spouts can form spray water curtains, but in the field of dust removal, there is ...

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Problems solved by technology

However, for the traditional slot nozzle structure, the conical contraction is used, which causes the boundary flow to be out of control, resulting in large resistance loss and flow field instability, which affects the film forming effect; therefore, the film forming effect is formed by using the slot nozzle For a better water curtain, it is necessary to optimize the flow field inside the nozzle

Combined with the experimental verification, Liu Lifang carried out numerical simulation of the water flow field inside the nozzle. The research shows that the water flow field inside the nozzle is the key to predict the velocity of the water jet; for circular, square, diamond and duckbill nozzles, Jiang Mingtao studied the internal flow In the field, it was found that non-circular nozzles enhanced the generation of turbulent energy on a larger scale; in the field of heat treatment of metal sheets and strips, Wang Zhaodong and others invented a cooling device that can form high-density jets, which can form high-density jets, but , the water consumption is large, and the outflow velocity is too high, which is not conducive to the mixing of the dusty airflow and the water curtain; then, Jiang Lianyun quantified the influence of the structural parameters of the gap nozzle on the jet diffusivity, and the results showed that the uniformity of the velocity of the nozzle outlet section The better, the shrinkage angle of the nozzle should be 20°~30°

However, for the reduction of drag loss and the optimization of the internal flow field of the slot nozzle, the boundary streamline and its design method have not yet been formed

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