Dynamic aerosol wind tunnel detection system

Abstract

The invention relates to a dynamic aerosol wind tunnel detection system, which comprises a plurality of air filters, an air cavity, an induced draft fan, a combustion section, a catalyst device, a diffusion section, at least one primary constant dilution type diluter, a draft fan, a forward scattering spectrometer probe (FSSP), a passive cavity aerosol spectrometer probe (PCASP), a data acquisition singlechip, and a jet diluter between an extended sampling interface and the air outlet of a last stage constant dilution type diluter, wherein the front end of the jet diluter is provided with a sample gas inlet, the lateral surface of the front end of the jet diluter is provided with more than one group of symmetrical compressed air inlets, the rear end of the jet diluter is provided with a sampling port, and the lateral surface of the rear end of the jet diluter is provided with an air outlet. The system can simulate onboard dynamic condition and the like and detect nuclear particle scale spectrums generated by flame bar combustion at different wind velocities and other aerosol generating devices.

Description

technical field [0001] The invention relates to an aerosol dynamic wind tunnel detection system, in particular to an aerosol dynamic wind tunnel detection system for simulating flame bar combustion and other aerosol generating devices under airborne conditions in the environment. Background technique [0002] Aerosol is a general term for solid or liquid particles suspended in the air, and 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 studying the risk assessment of aerosols on human health or controlling the production process to produce a satisfactory aerosol system, people need to use many tools to understand and measure aerosols. However, i...

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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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