Test section suitable for optical measurement of longitudinal combustion instability in high temperature and high pressure environment

Abstract

The invention discloses a test section suitable for longitudinal combustion unstable optical measurement under high-temperature high-pressure environment. The test section comprises a test section body, an air film cooling plate, an inner layer glass gland, an inner layer glass plate, an outer layer glass plate and an outer layer glass gland; the test section body is provided with a combustion chamber, air inlets are formed in the two side walls of the test section body, the top of the test section body is provided with a cylindrical glass mounting groove communicating with the combustion chamber, the air film cooling plate is placed on the bottom of the glass mounting groove in a sealed manner, the inner layer glass gland comprises a columnar part, and the columnar part comprises an innerlayer glass containing groove, a spacing board and an outer layer glass containing groove which are coaxially arranged in sequence from bottom to top. The test section can be suitable for the gas working condition range of 3 to 8 MPa, 2800K to 3500K. for a shrinkage ratio liquid oxygen / kerosene rocket engine, the range can be enlarged to be suitable for high-temperature high-pressure combustion environment, the section aims at achieving optical observation of the high-temperature high-pressure environment, due to the dual-layer glass structure, glass bursting in the test can be effectively prevented, and safety and reliability are achieved.

Description

technical field [0001] The invention relates to the technical field of liquid rocket engines, in particular to a test section suitable for optical measurement of longitudinal combustion instability in high temperature and high pressure environments. Background technique [0002] From the beginning of the development of liquid rocket engines, the phenomenon of combustion instability has attracted the attention of researchers from various countries. At present, the root cause and mechanism of the combustion instability caused by this strongly nonlinear combustion have not been fully matured. With the increasing number of space missions, more and more attention has been paid to the hazards caused by the unstable combustion of liquid rocket engines. [0003] Due to the high-temperature and high-pressure environment in the rocket engine, the study of combustion instability can generally only use high-frequency pressure sensors. The combustion and flow field information that can...

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Problems solved by technology

However, at present, the applicable temperature range of high-temperature quartz glass is about 1400~1500K, and it is difficult to directly withstand such a high temperature.

At the same time, the pressure resistance of quartz glass decreases at high temperature, and it is easy to be crushed due to local stress concentration

[0006] Optical observation under high temperature and high pressure environment is a difficult problem in the study of engine combustion instability mechanism. At present, there is no optical glass that can be directly applied to this environment.

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