Method for determining boundary streamline of gap nozzle for creating wide and thin water curtain

Abstract

The invention discloses a gap nozzle boundary streamline determination method for creating a wide and thin water curtain. According to the method, a streamline gap nozzle model is mainly analyzed according to a hydromechanics plane potential flow theory, water flow entering a contraction section B from a parallel section A of a nozzle inlet is regarded as synthetic flow of parallel plane flow and point convergence, and flow from the contraction section B to a nozzle outlet is regarded as synthetic flow of the point convergence and the parallel plane flow; a specific potential function and a flow function are established, and a streamline boundary equation is deduced. According to the method for determining the boundary streamline of the gap nozzle for creating the wide and thin water curtain, the streamline boundary streamline of the gap nozzle is designed, the flow resistance loss of the gap nozzle is reduced, an internal flow field is optimized, and particularly, outlet speed distribution is homogenized.

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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