Device and method for measuring flame aerosol flow rate

Abstract

The invention discloses a flame aerosol flow rate measuring device, which is characterized in that it includes a basic support seat, an XYZ three-axis moving platform, a bidirectional cylinder, a self-locking tweezer connector, a self-locking tweezer, a probe sheet, an electromagnetic valve and a time relay , the XYZ three-axis moving platform is installed on the basic support base; the two-way cylinder is installed on the XYZ three-axis moving platform; the self-locking tweezers are installed on the two-way cylinder through the self-locking tweezers connector; the probe sheet is round as a whole shape, which is installed on the self-locking tweezers, and is used to extend into the flame aerosol for sampling; the solenoid valve and time relay are used to jointly control the movement of the two-way cylinder, and then control the stay of the probe sheet in the flame aerosol time. The invention adopts the thermophoresis sampling probe, which can greatly reduce the radiation and heat conduction loss of the probe, and keep the convection heat transfer dominant in the heat transfer between the flame and the probe, so as to solve the flow velocity of the flame aerosol.

Description

technical field [0001] The invention belongs to the field of measuring devices, and more particularly relates to a measuring device and method for flame aerosol flow rate. Background technique [0002] The measurement of flame aerosol flow velocity currently lacks a set of feasible methods. Commonly used flow velocity measurement techniques, such as particle image velocimetry (PIV), laser Doppler velocimetry (LDV), etc., need to uniformly spread micron-scale tracers in the flow field. Particles, which are difficult to achieve for small-scale flame aerosol reactors, and the addition of tracer particles will have adverse effects on the generation and evolution of fine particles contained in flame aerosols. [0003] Thermophoretic deposition sampling is a widely used sampling method for flame aerosol particles. Combined with electron microscope image processing and analysis, it is mainly used to characterize the microstructure and morphology of particles, the volume fraction of...

AI Technical Summary

Problems solved by technology

However, the existing thermophoretic sampling technology usually uses transmission electron microscope copper grid to sample flame aerosol. Due to the high temperature oxidation environment of the flame, the support film and even the copper grid on the copper grid are easily burned, and more importantly, copper such as There is a strong radiation heat transfer between the material and the flame and copper has a high thermal conductivity, so it is difficult to eliminate the effects of radiation and heat conduction

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