| Nozzle is the core part of wind tunnel, and it has a critical influence on the airflow of the wind tunnel. In this dissertation, with the background of wind tunnel reconstruction of one country key project, nozzle design and flow field-testing is studied. The main achievements are summarized as follows:(I)The M8 nozzle contour is designed by the characteristic line and the bound layer correction. Based on the M7 nozzle, the M8 nozzle is designed by throat approximation. The aerodynamic design of curve of nozzle adopts perfect gas Cresco method to calculate non-existence glutinous model surface, the correct boundary layer of the nozzle wall side adopts Sivells-Payre method, and the calculation of constringency part of the nozzle adopts Stock formula.(II)In order to validate the feasibility and correctness of the design, the CFD software is used to calculate the M7 and M8 nozzle inside flow field. The distributing of Mach number in the whole filed and in the exit section is provided. The verification results show that the theoretical analysis of nozzle is correct, the curve of the nozzle contour satisfies the design requirements, and the designed nozzle has reached the general industry criterion.(III)The structure design of the nozzle is completed according to coordinate data of the nozzle contour. The airproof design problem and the throat-cooling problem are mainly solved during the structure design. The machining, installation, debug of the nozzle are completed after its design, and the finial running results of the nozzle are provided.
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