Combustion chamber wall temperature gradient measurement module

Abstract

The present invention belongs to the field of the temperature measurement technology, and specifically relates to a nozzle section chamber wall temperature gradient measurement module of a liquid-propellant rocket engine combustion chamber. The module provided by the invention has an annular structure, and comprises an annular pressure plate, five thermocouple sensors, springs, separation blades, heat insulation linings and support sleeves. A disc-shaped separation blade is welded at each thermocouple sensor, one end, at the upper portion of the separation blade, of the each thermocouple sensor passes through a support sleeve and a spring, the support sleeves are sleeved with the springs and sleeved with the annular pressure plate, and the portions, below the separation blades, of the thermocouple sensors penetrate into the heat insulation linings. According to the invention, the temperature of the inner wall structure of the cooling channel in a cross section of the combustion chamber nozzle section may be measured, so that the parameters such as heat flow, gas wall temperature and outer wall temperature at the local place may be obtained.

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 nozzle 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 maximum heat flux density of the wall of the nozzle section of the combustion chamber can reach hundreds of MW / m2, and the temperature difference borne by the structural materials often reaches more than several hundred K, and the heat flow changes drastically along different axial positions, and the working environment is extremely harsh. The site where the failure occ...

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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 shrinkage and expansion of the surface in the combustion chamber, the heat flow changes drastically at different positions along the axial direction, and the heat flow is not the same at different positions along the axial direction. In this way, the average heat flow cannot accurately reflect the actual local heat flow, and due to the use of segmented water cooling body parts, the structure and heat transfer state of the coolant side are quite different from those of 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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