Abstract
The numerical analysis and performance evaluation of the flow field uniformity in a slotted test section of a 0.3 m cryogenic continuous transonic wind tunnel in full and half models were conducted. Factors affecting the flow field uniformity in the slotted test section of the transonic wind tunnel were analyzed. The regular pattern of a stationary region and expansion waves on the solid wall surface of the strut section was studied. On the basis of the distribution of expansion and compression waves on the strut section, the optimal design and performance of sting surface, cross section, and sidewall shapes and the area expansion ratio of the strut section were evaluated. In the slotted test section of the transonic wind tunnel, the root-mean-square deviation of Mach numbers was improved. The area expansion ratio of the strut section decreased from 1.30 to 1.22. The expansion wave caused by the wall expansion structure at the entrance of the strut section is the main factor causing strut section choking, which further explains the mechanism for the failure of the second throat at a high subsonic speed in the slotted test section of traditional transonic wind tunnels.
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