A structure for water-cooled throat of high Mach number surface nozzle in hypersonic wind tunnel

Abstract

The invention discloses a structure for a water-cooled throat of a high Mach number surface nozzle in a hypersonic wind tunnel, comprising a first water channel lining block and a second water channel lining block; the first water channel lining block and the second water channel lining block are installed On the outside of the throat inner shell, the first waterway lining block and the second waterway lining block are fixed on the throat inner shell through the lining block connecting screws; the combination of the first outer shell and the second outer shell forms the water-cooled throat section of the high Mach number nozzle; inside the throat The shell is an axisymmetric funnel-shaped metal cylinder, and the outside of the throat inner shell is provided with water channels and water channel dividing ribs, and the outer surfaces of the cylindrical platforms at both ends of the throat inner shell are respectively provided with bosses for sealing. The throat section of the structure adopts a fully assembled structure without welding process, which eliminates the influence of welding residual stress on the deformation of the throat section during use; the inner shell of the throat can be replaced, reducing the maintenance cost after damage during use , shorten the post-processing cycle, and the high-pressure and high-temperature seal is reliable.

Description

technical field [0001] The invention relates to the field of hypersonic wind tunnel test equipment, in particular to a structure for a water-cooled throat of a high Mach number surface nozzle in a hypersonic wind tunnel. Background technique [0002] The profile nozzle is the core component of the hypersonic wind tunnel, and it is an important part of the wind tunnel to ensure a certain Mach number and a certain uniformity of airflow. After being rectified by the stable section, the wind tunnel airflow enters the constriction section, which gradually accelerates the airflow from subsonic speed to sonic speed, and then starts from the throat of the nozzle, the airflow accelerates through expansion, and reaches a given Mach number at the nozzle outlet. Given a certain ratio of the throat area to the nozzle outlet area of ​​the nozzle, only the corresponding Mach number can be obtained. Maintaining the shape of the inner profile of the nozzle is an important factor to obtain th...

AI Technical Summary

Problems solved by technology

Therefore, the materials used to manufacture the throat section of the nozzle must first have high strength, good processing performance, and good thermal conductivity. Materials with the above properties generally cannot be used at high temperatures if cooling measures are not considered. Under long-term use

If the cooling structure is improper, problems such as ablation and deformation of the throat inner shell material will occur during operation, resulting in uneven distribution of the Mach number at the nozzle outlet, and the flow field performance index will not meet the requirements of the relevant national military standards, and it will not be possible to invest in For aircraft model ground test research applications, the nozzle throat section needs to be scrapped and put into production again

[0005] At present, the throat section of most high Mach number nozzles adopts the structure of copper alloy and stainless steel vacuum diffusion welding. This structure has complex manufacturing process, high precision requirements of diffusion welding tooling, long processing cycle and high cost. Diffusion welding During the process, the water channel is likely to be crushed and collapsed, which reduces the cooling effect, and the inner shell of the throat cannot be replaced after being damaged, resulting in the scrapping of the entire throat section and the need for re-feeding and processing.

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