Rotating piece temperature measuring device and method based on thermochromic liquid crystal

Abstract

The invention provides a rotating piece temperature measuring device and method based on a thermochromic liquid crystal. A photographing device captures a thermochromatic liquid crystal film arrangedon the surface of a rotating member through the derotator, a signal processing device analyzes a static thermochromatic liquid crystal spectrum obtained by the photographing device and outputs rotating member surface temperature field data, and the visualization process of the rotating member surface temperature field is achieved. The device comprises a main shaft, a support bearing, a rotating member, the thermochromatic liquid crystal film, the derotator, the photographing device, the signal processing device, a heating device, a motor and a transmission device. Non-contact measurement is adopted, the structure and flow field properties of a test are not affected, high-resolution and continuous temperature field data can be outputted, the device and the method are suitable for the rotating member whose surface is a plane or a complex geometric curved surface, and at the same time, the device and the method have the advantages of a fast reaction speed, good display characteristics, high spatial resolution and reusability.

Description

technical field [0001] The invention relates to the field of measuring the surface temperature of a rotating part, in particular to a temperature measuring device and method for a rotating part based on thermochromic liquid crystals. Background technique [0002] Rotating machinery is widely used in electric power, petrochemical, metallurgy, and aerospace sectors. Typical rotating machines include steam turbines, gas turbines, centrifugal and axial compressors, fans, pumps, water turbines, generators and aeroengines. Rotating parts are an extremely important and common element of rotating machinery. With the improvement of rotating machinery design technology and the development of experimental verification, the experimental research on heat transfer and flow characteristics of rotating parts is becoming more and more extensive and in-depth, and obtaining the temperature distribution of rotating surfaces is the basis for studying the heat transfer and flow characteristics o...

AI Technical Summary

Problems solved by technology

The thermocouple temperature measurement method is to use a series of thermocouples arranged along the radius of the rotating part to measure the temperature distribution of discrete points at different radii. To obtain as accurate a temperature distribution as possible, it is necessary to arrange as many temperature measurement points as possible. Not only does it increase the difficulty of measurement, but it is also impossible to obtain a completely continuous temperature field distribution; using temperature-indicating paint to measure temperature can obtain a continuous temperature field distribution, but the change of temperature-indicating paint is irreversible and cannot be reused, and each temperature measurement needs to be re-arranged The new temperature-indicating paint increases the complexity of the test; the infrared temperature measurement technology measures the surface temperature of the high-speed rotating disk, and there are problems such as installation difficulties, and it is not suitable for temperature measurement of high-speed rotating parts

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