Measuring device and measuring method for drag coefficient of irregular particle

Abstract

The invention provides an accurate measuring method for a drag coefficient of an irregular particle. A vertical charge coupled device (CCD) high-speed camera of which the shooting direction is vertical downwards is arranged right above a transparent square pipeline, and meanwhile, a horizontal CCD high-speed camera of which the shooting direction is vertical with the wall face of the square pipeline is horizontally arranged outside the square pipeline. One particle is freely released against the airflow direction of the square pipeline by utilizing a particle electromagnetic holding device, and the drag coefficient of the particle is obtained through analyzing an XOY planar projection image sequence and an XOZ planar projection image sequence which are shot by the two CCD high-speed cameras. Under the condition that a convection field is not disturbed, the drag coefficient of the particle is accurately measured in real time.

Description

[0001] The invention relates to a device and method for measuring the drag coefficient of particles with irregular shapes in a gas-solid two-phase flow, belonging to the technical field of fluidized bed and multiphase flow measurement. Background technique [0002] The resource utilization of combustible solid waste is an effective way to alleviate the pressure of traditional fossil energy supply, promote the formation of a diversified energy structure, and reduce solid waste pollution. Combustible solid waste mainly includes combustible industrial solid waste, combustible domestic garbage and combustible agricultural and forestry waste. The treatment of the above three types of combustible solid waste is mainly based on thermochemical methods, that is, these solid waste particles are in the fluidized state. Next, it is converted into fuel or chemical raw material through combustion, gasification and pyrolysis. [0003] Compared with the conventional coal-fired fluidized bed, ...

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Problems solved by technology

[0004] However, due to the lack of scientific measurement devices and methods, the drag mechanism of irregularly shaped particles has not been fully grasped so far, and the design and calculation of solid waste heat treatment reactors lack a reliable drag coefficient model for irregular particles, such as in solid waste In the design calculation or numerical simulation optimization of the fluidized bed, the usual practice is to use the "spherical coefficient" to modify the classic spherical particle drag model

This kind of approximate processing often brings large errors or even errors in design calculations and scientific research.

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