Linear colored contaminant eddy diffusion simulation system in large-sized environment air tunnel

Abstract

The invention relates to a linear colored pollutant convective diffusivity simulation system in a large-scale environment wind tunnel. An airflow inlet is arranged at the central position of the bottom of a fume mixer; an L-shaped steel pipe is communicated with the fume mixer through the airflow inlet and the other end of the steel pipe is connected with a vortex air pump through an air pump connecting pipe; a support bracket with a base and a handle is arranged above the airflow inlet and smoke-producing material is arranged on the support bracket; the periphery on top of the fume mixer is provided with a fume distribution opening; the bottom of a fume mixing tank is provided with a fume inlet, and the upper part of the fume mixing tank is communicated with a narrow fume distribution groove which is perpendicular to the length direction of the wind tunnel, inserted into the central axis of a test stand connected at the bottom of the wind tunnel and communicated with the wind tunnel; a vertical speed remove cover plate is horizontally arranged above the narrow fume distribution groove higher than the surface of the test stand at the bottom of the wind tunnel, with a gap being left; and one end of each fume connecting pipe is connected with the fume distribution opening of the fume mixer, the other end is connected with the fume inlet of the fume mixing tank. The simulation system can realize the quantitative control of fume and meet the precision requirements of CCD image analysis.

Description

technical field [0001] The invention relates to a linear colored pollutant convection and diffusion simulation system in a large-scale environmental wind tunnel. The system is matched with a laser concentration field test system and belongs to the technical field of air pollution control technology and air pollutant convection and diffusion wind tunnel experiment research. Background technique [0002] Exhaust emissions from motor vehicles have become the main source of air pollution in metropolises. Studying the convective diffusion of motor vehicle exhaust in urban environments is of great significance for environmental assessment, architectural layout planning, and even traffic planning involving environmental capacity constraints. For the research on the convection and diffusion of atmospheric pollutants, there are three methods to follow: wind tunnel experiments, CFD (Computational Fluid Dynamics, Computational Fluid Dynamics) and field observations. Among them, wind t...

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Problems solved by technology

Its purpose is that it overcomes the difficulty in controlling the distribution uniformity of the existing line source generating device, the uneven air flow in the space, the poor continuity of the smoke, the improper selection of the smoke material used for the experiment, and the easy condensation and deposition of the smoke in the hot state. Blockage of pipelines; the color of the discharged pollutants is difficult to match with the laser test system and other disadvantages; the linear colored smoke emitted by the present invention has almost the same amount of smoke, air pressure and smoke velocity at each distribution point, which not only satisfies wind The requirements for simulating the release of uniform linear pollutants in the hole experiment, and can also be matched with the laser concentration field test system to meet the requirements of the laser test system for the color of pollutants, making the test results more realistic and accurate

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