An integral measuring device for nozzle temperature and ablation amount and its manufacturing method

Abstract

The invention belongs to the field of sensor measurement, and in particular relates to an overall measuring device for nozzle temperature and ablation amount and a manufacturing method thereof. The device includes a phenolic resin-based fiber-reinforced matrix and multiple ultra-fine thermocouples, as well as fastening devices for fixing it to the nozzle. The thermocouples are fixed inside the material through a phenolic resin curing process, and the thermocouple measurement junction is close to the inner wall of the nozzle. Placement, multiple thermocouples are arranged at intervals, and their distances from the wall are all different. The thermocouple wires are led out through the central hole of the fastening screw, and the central hole of the fastening screw is filled with high temperature resistant material filler. The invention can not only monitor the real-time temperature at different depths, but also monitor the ablation amount of the material, and change the measurement range and accuracy of the ablation amount by changing the number of thermocouples and the positions of the thermocouples. When in use, the thermocouples are fixed on the measured In the material, the error caused by the material difference is reduced, and only a small measurement hole needs to be drilled on the side of the nozzle to achieve a larger ablation measurement range.

Description

technical field [0001] The invention belongs to the field of sensor measurement, and in particular relates to an overall measuring device for nozzle temperature and ablation amount and a manufacturing method thereof. Background technique [0002] The working environment of the engine nozzle is harsh. In order to meet the purpose of heat insulation and control the weight of the structure, phenolic resin-based fiber reinforced materials are usually used as the ablation-resistant material of the nozzle. During the operation of the engine, the ablation-resistant material will undergo thermochemical ablation , Mechanical erosion phenomenon, causing the inner surface of the nozzle to retreat. In practical applications, the amount of ablation is crucial to nozzle design. [0003] For the measurement of material ablation during the working process, the usual method is to embed metal wires at different depths of the material, and judge whether the material is ablated to the correspo...

AI Technical Summary

Problems solved by technology

[0004] However, the on-off ablation sensor can only output a step signal for judging the ablation position, and cannot output the temperature data of the measurement point

The method of placing the switch circuit has a large structural volume, and the ablation position can only be judged according to the step voltage, and the temperature cannot be measured, and it is necessary to drill holes in multiple positions, which greatly damages the structure of the nozzle

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