Dynamic detection wind tunnel of air line type stepless speed regulating aerosol

Abstract

A dynamic testing wind tunnel for straight-road type stepless speed aerosol comprises an air filtering system, a wind tunnel body and a suction type dilutor, wherein the air filtering system comprises a plurality of air filters and a stepless speed draft fan, a plurality of air inlets which are connected with the air filters and an air outlet are arranged on the draft fan; the wind tunnel body comprises a combustion section comprising a hollow cylindrical tube and a catalyzer device arranged therein, and a diffusion section being of hollow cylinder, one end of which is straight discharge end,the other end is tapered port; the diffusion section is connected with the combustion section through flange, and the combustion section is connected with the draft fan, the other end of the diffusion section is connected with the suction type dilutor; a pitot tube speed-measurement fitting port is respectively designed in the cavity of the hollow cylindrical tube and the cavity of the diffusion section. The invention has advantages of adjustable wind speed, wide application range, convenient operation, capability of simulating aerosol testing of dynamic condition, especially has great application value in measuring nuclear particle scale of flare combustion in a simulated airborne conditions.

Description

technical field [0001] The invention relates to a detection device for the flow velocity of an aerosol under dynamic conditions, in particular to a dynamic detection wind tunnel of a straight-way stepless speed regulation aerosol. Background technique [0002] Aerosol is a general term for solid or liquid particles suspended in the air, which is a collection of liquid or solid ions that can be suspended in a gaseous medium for a long time. With the development of industry, there will be a stage of aerosol generation intentionally or unintentionally in many processes. For example, when the feed material passes through a flame, laser or furnace, it may provide suitable particles for the generation of aerosol. Whether it is to study the risk assessment of aerosols on human health or to control the production process to produce a satisfactory aerosol system, people need many tools to understand and measure aerosols. However, in some cases, the existing measurement methods cannot...

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Problems solved by technology

The combustion section of the test wind tunnel has a diameter of 25.4 cm, a length of 1.5 meters, and a design wind speed of 40 m / s. The full-scale positive pressure and constant velocity sampling of the flame rod, but the positive pressure detection is used. When the sampling nozzle is facing the aerosol flow for sampling, due to Due to the inertia of aerosol particles, when the flow velocity of the aerosol flowing into the sampling nozzle is greater than the flow velocity in the wind tunnel, the result will be low, otherwise it will be high

Therefore, the results of positive pressure detection are still inaccurate

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