Backflow type high temperature hot wind tunnel structure

Abstract

The invention belongs to the calibration field of a temperature sensor, and relates to a backflow type high temperature hot wind tunnel structure for calibrating the temperature sensor. The backflow type high temperature hot wind tunnel structure includes an air compressor (1), an air storage tank (2), a control valve (3), a first convergence section (4), a mixing section (5), a diffusion section (6), a heating section (7), a second convergence section (8), and a test section (9). The backflow type high temperature hot wind tunnel structure is characterized by comprising a jet injection section (10), a semicircle section (11), and a backflow section (13). The backflow type high temperature hot wind tunnel structure for calibrating the temperature sensor greatly improves the uniformity of a temperature field, decreases the dispersibility of calibration data, reduces the energy consumption and the calibration cost, and is suitable for static state metering detection.

Description

technical field [0001] The invention belongs to the field of temperature sensor calibration, and relates to a backflow type high-temperature hot air tunnel structure used for calibrating temperature sensors. Background technique [0002] Sensor calibration for temperature measurement is an important supporting technology to ensure the authenticity and accuracy of experimental data. At present, in thermal metrology, the temperature sensor can be calibrated by forming a relatively constant temperature field in an oil tank or a salt tank. Normally, the maximum calibration temperature of the oil tank does not exceed 300°C, and the maximum calibration temperature of the salt tank does not exceed 500°C. Calibration at higher temperatures is usually carried out in well-type or tube-type furnaces. Most of these furnaces are designed for calibrating the thermoelectric characteristics of dual wires, so the furnace chamber is usually narrow and the constant temperature area is narrow....

AI Technical Summary

Problems solved by technology

The special-shaped temperature sensor usually cannot be calibrated because its temperature-sensing rod section cannot be placed in the constant temperature zone of the furnace

Domestically developed a hot wind tunnel using a direct current wind tunnel for dynamic calibration. The existing problems are: first, the temperature field is not uniform, and the calibration data is highly dispersed; second, the energy consumption is large and the calibration cost is high; Third, it is not suitable for static metrology verification

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