Manufacturing technology for axisymmetric nozzle of conventional hypersonic wind tunnel

Abstract

The invention discloses a manufacturing technology of an axisymmetric nozzle of a conventional hypersonic wind tunnel. The manufacturing technology comprises the processes of manufacturing of a nozzle blank piece, machining of a part section, detecting and assembling of the nozzle, through control on the important links of controlling nozzle product manufacturing residual stress elimination, inner molded surface machining precision, inner molded surface roughness, nozzle coaxiality, nozzle assembling clearance, connection difference treatment and the like, the deviation between the inner molded surface of the manufactured nozzle and the theoretical molded surface meets the precision requirement, it is ensured that the nozzle obtains the velocity field quality meeting the national military standard requirement, and the manufacturing risk and the repetition of the machining process in the machining process are reduced. The manufacturing technology has already been applied to manufacturing of axisymmetric molded surface nozzles of phi 0.5 m magnitude, phi 1 m magnitude and phi 2 m magnitude, and the maximum Mach number deviation in a uniform area of a velocity field of the nozzle is smaller than 1% of the national military standard requirement.

Description

technical field [0001] The invention relates to the field of conventional hypersonic wind tunnel equipment manufacturing, in particular to a conventional hypersonic wind tunnel axisymmetric nozzle manufacturing process. Background technique [0002] The conventional hypersonic wind tunnel is a ground simulation test equipment for the development of hypersonic vehicles and aerodynamic research. It is an important infrastructure for the aerodynamic design, optimization, verification and assessment of national major models to meet the long-term strategic needs of the national defense and aerospace industry. . [0003] The axisymmetric profile nozzle is a core component of a hypersonic wind tunnel. The quality and performance of its velocity field directly determines the flow field performance of the wind tunnel, which is directly related to the accuracy and accuracy of the aircraft test data, and thus the flight performance of the aircraft. and flight safety. [0004] The qua...

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Problems solved by technology

[0005] A complete set of nozzles is generally very long and cannot be processed as a whole. The nozzles need to be designed and processed in sections, and finally assembled into a complete set of nozzles; conventional hypersonic wind tunnel nozzles are difficult to process, and the processing The cycle is long, and a set of nozzles requires a long service life

The manufacturing process of nozzles in different production units is different, and the velocity field index of the processed nozzles is often unqualified, which leads to the scrapping of the nozzles and the need for re-feeding and processing, resulting in a large loss of funds and delaying the formation of wind tunnel test capabilities

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