A measurement system for thermal field distribution of sonic nozzle pipe wall

Abstract

The invention relates to a thermal field distribution measurement system of a sonic nozzle pipe wall, which includes an adiabatic fixture for clamping a sonic nozzle in a fluid channel, and a miniature thermocouple array for collecting the section temperature of a sonic nozzle, and the adopted sonic nozzle is made of metal In this way, the heat-insulating fixture is made of heat-insulating material, including two fixture units that can be disassembled and can be fixedly connected together, each fixture unit includes a fixture shell and a clamping column located on the axis of the fixture, and the clamping column The middle part of the body is provided with a through fluid channel, and the ends of the clamping cylinders of the two clamp units are respectively sealed and connected with one end of the sonic nozzle, so that the sonic nozzle is fixed on the axis of the heat insulating fixture and communicated with the fluid channel. After the fixture unit is fixedly connected, an annular gap is formed between the fixture shell and the clamping cylinder; thermocouple implantation holes with different positions and different depths are provided on the body of the sonic nozzle for implanting a thermocouple sensor array.

Description

technical field [0001] The invention relates to a sonic nozzle pipe wall thermal field distribution measurement system belonging to the field of gas flow detection. Background technique [0002] Sonic nozzle is one of the most commonly used flow sensors, which are widely used in the field of flow measurement, and have the characteristics of reliable performance, simple structure, and high accuracy level. However, due to the structural characteristics of the sonic nozzle itself, the flow rate of the gas in the nozzle will continue to increase, the volume of the gas will continue to expand, and with the decrease of the gas temperature, the heat transfer between the low-temperature gas and the wall of the sonic nozzle will cause the temperature of the nozzle wall to change, and then Adversely affect the performance of the sonic nozzle. With the application of sonic nozzles in aerospace technology, medical field, petroleum processing and other fields, the research on the perfor...

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Problems solved by technology

[0003] At present, the measurement and reconstruction of the temperature field on the wall surface of the sonic nozzle are mostly carried out by means of contact with traditional temperature sensors, or non-contact temperature measurement by infrared thermometers. The above-mentioned temperature measurement methods can reflect the temperature of the nozzle wall to a certain extent. However, the temperature measurement system is greatly affected by environmental changes, the temperature measurement range is limited and it is difficult to obtain detailed pipe wall temperature information, and the temperature measurement steps are not systematic enough

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