Device and method for measuring flow velocity of flame aerosol

Abstract

The invention discloses a device for measuring the flow velocity of flame aerosol, and the device is characterized in that the device comprises a base supporting seat, an XYZ three-axis mobile platform, a bidirectional cylinder, a self-locking tweezers connecting part, a self-locking tweezers, a probe sheet, a solenoid valve, and a time relay; the XYZ three-axis mobile platform is disposed on the base supporting seat; the bidirectional cylinder is disposed on the XYZ three-axis mobile platform; the self-locking tweezers is disposed on the bidirectional cylinder through the self-locking tweezers connecting part; the probe sheet is integrally shaped like a circle, is disposed on the self-locking tweezers, and is used for extending into the flame aerosol for sampling; and the solenoid valve and the time delay are used for jointly controlling the movement of the bidirectional cylinder, thereby controlling the stay duration of the probe sheet in the flame aerosol. The device can greatly reduce the radiation and thermal condition loss of a probe through employing a thermophoresis sampling probe, and enables convective heat transfer to remain the main heat transfer between flame and the probe, so as to obtain 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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