High temperature and high pressure radiation heat flow meter

Abstract

The heat flow meter for pure radiation heat flow on the wall surface of high temperature and high pressure environment is characterized by the use of sapphire glass windows to isolate the influence of convection and heat conduction, and the heat flow meter for measuring the axial thermoelectric potential of the heat-absorbing cylinder to determine the radiation heat flow. The sapphire glass window used is a single-sided convex lens structure, which can effectively expand the measurement viewing angle. At the same time, the round window chamfer is precisely designed, which can further expand the test angle of the radiant heat flow meter, so that the measurement angle can reach 150°. The sapphire glass window serves to isolate the effects of both convective and conductive heat flows, allowing the calorimeter to measure only radiative heat flow. A cooling structure is arranged on the lower surface of the heat absorber to cool the lower surface, so that the heat absorber forms a stable axial temperature distribution, and the pure radiation heat flow of the wall is measured by measuring the temperature difference between the upper and lower surfaces of the heat absorber.

Description

technical field [0001] The invention relates to a measuring device for the radiation heat flow of a combustion chamber, which can measure the radiation heat flow of the wall surface in the high-temperature and high-pressure environment of the combustion chamber of an aviation gas turbine. Background technique [0002] With the development of modern aviation technology, the gas temperature in the combustion chamber can reach 2000°C or even higher. In order to prevent damage to the flame tube and increase the service life, a more reasonable and efficient cooling design must be adopted to ensure that the wall temperature of the flame tube is within the allowable range of the material. This means a better understanding of the heat transfer processes in the combustion chamber wall cooling. For most cases, a large part of the heat transfer from the hot gas to the wall in the main combustion zone of the combustion chamber is radiation heat transfer. In the case of very effective g...

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Problems solved by technology

In addition, the size of the measurement angle of view will also directly affect the ratio of the actual measured radiation heat flow to the radiation heat flow from all directions in the real situation, and then directly affect the measurement accuracy of the radiation heat flow

Judging from the currently published literature, the heat flow meters used are mainly contact heat flow meters that mainly measure heat conduction heat flow, and heat flow meters that directly measure radiation heat flow are basically not found.

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