Method and device for measuring gas-solid jet flow field by combining terahertz wave and infrared light wave

Abstract

The invention discloses a method for measuring gas-solid jet flow fields by combination of terahertz wave and infrared optical wave and a device thereof. By combination of terahertz imaging and infrared optical wave thermal imaging methods, the whole gas-solid jet flow field is measured. Terahertz wave is rectified to parallel rays and penetrates the gas-solid jet flow field; terahertz spectrum attenuated by the flow field is analyzed; by comparison of the terahertz spectrum with known gas composition, gas-phase field distribution information of the measured gas-solid flow field is obtained; solid particles are heated to a certain temperature and enters the measured flow field area with the gas-phase jet flow; the solid particles distributed in the flow field emit infrared optical waves all around; motion trajectory and distribution information of the solid particles are captured by an infrared thermal imaging technology; and gas-solid jet flow field information are simultaneously obtained at real time by combination of two imaging methods, namely the terahertz imaging and infrared optical wave thermal imaging methods. The invention provides a new method for simultaneously measuring gas-solid flow fields. The method has advantages of good system stability, high feasibility and high measurement accuracy.

Description

technical field [0001] The invention relates to a method and a device for measuring a gas-solid jet flow field by combining terahertz waves and infrared light waves, which belong to the multiphase flow measurement technology. Background technique [0002] Gas-solid two-phase jet flow is a flow mode commonly used in engineering installations, such as in general industry: power station pulverized coal boiler pulverized coal jet combustion; in aerospace industry: rocket combustion ejected jet. How to stabilize combustion, enhance heat transfer, and achieve high-efficiency combustion? Although there are some empirical formulas and designs, the mechanism of this flow is still not very clear. Therefore, with the development of science and technology and the renewal of equipment, the research on gas-solid two-phase jet flow and related experimental testing techniques have received great attention and development. [0003] Since the 1980s, many scholars have sought methods for non-...

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Problems solved by technology

[0005] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a method and device for measuring the gas-solid jet flow field by combining terahertz waves and infrared light waves, which is used to solve the limitation that conventional measurement methods can only measure solid phase fields The PIV measurement method uses the tracer particle flow behavior to characterize the gas phase field, which inevitably causes errors, and the improved PIV measurement method cannot ignore the impact of the gas phase tracer particles on the solid phase particles when measuring the gas-solid field at the same time.

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