A combustion chamber wall temperature gradient measurement module

Abstract

The invention belongs to the technical field of temperature measurement, and in particular relates to a temperature gradient measurement module for a cylinder section wall of a combustion chamber of a liquid rocket engine. The module has a flat structure, including a flat platen, 5 thermocouple sensors, springs, baffles, heat-insulating bushings, and support sleeves; each thermocouple sensor is welded with a disc-shaped baffle at the temperature-sensing end, and the thermocouple The sensor passes through the support sleeve and the spring at one end of the upper part of the baffle, and the support sleeve is inserted into the spring and inserted into the planar pressure plate together; the thermocouple sensor penetrates into the heat-insulating bushing at the lower part of the baffle. The invention can measure the temperature of the inner wall structure of the cooling channel of the cylindrical section of the combustion chamber, thereby obtaining parameters such as local heat flow, gas wall temperature, and outer wall temperature.

Description

technical field [0001] The invention belongs to the technical field of temperature measurement, and in particular relates to a temperature gradient measurement module for a cylinder section wall of a combustion chamber of a liquid rocket engine. Background technique [0002] The working medium in the combustion chamber of the liquid rocket engine is high-pressure gas above 3000K. In order to avoid ablation damage to the chamber wall, a milling channel is provided between the inner wall and the outer wall of the combustion chamber, and a low-temperature fluid is introduced to cool the chamber wall structure. The heat flux passing through the wall of the cylindrical section of the combustion chamber often reaches tens of MW / m2, and the temperature difference borne by the structural materials often reaches more than hundreds of K, and the working environment is very harsh. Therefore, understanding the heat transfer process in the thrust chamber is one of the most important prer...

AI Technical Summary

Problems solved by technology

However, because the rib width and wall thickness of the milling groove cooling structure are very thin (the rib width is usually 1-2mm, and the wall thickness is generally only 0.6-1mm), it is difficult to arrange ordinary sensors in the structure to affect the heat flux density, air wall temperature, etc. Parameters are directly measured

[0004] The traditional calorimetric scaling combustion chamber can only obtain the average heat flow in a certain section, but affected by the combustion process in the combustion chamber, the heat flow is not the same at different positions along the axial direction, so that the average heat flow cannot accurately reflect the actual local area. Heat flow, and due to the use of segmented water-cooled body parts, the structure of the coolant side, the heat transfer state is quite different from the full size, and the application error of this method is relatively large

Although the method of embedding thermocouples in the inner wall can directly measure the temperature of the gas wall, because the depth of the shallow groove processed by embedding thermocouples is generally above 0.5, and the temperature of the structure may change to tens of K in the direction of this depth, the measured The accuracy of the air wall temperature value is not very high

Moreover, when inserting the sensor, it is necessary to process through holes on the inner and outer walls, and the surface of the shallow groove on the inner wall needs to be electroplated with copper to ensure sealing. Not only is the process complicated, but it is also prone to defects.

In the past, the temperature of the outer wall of the combustion chamber was measured by spot welding thermocouples on the outer wall. From the actual situation, due to the influence of external thermal environment, vibration environment and other factors, the measurement results often have problems such as glitches and distortion.

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