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From the previous operational experience for the high speed cryogenic tunnel at National Defense Academy (NDA), its original manual control systems were partially modified, and a limited automatic control capability has been added. Though this modification was intended to improve the steady state operation, the control accuracy of both of the steady and transient operations was greatly improved, compared with that of the previous manual controls. The preliminary tunnel calibration tests were intensively performed at both of ambient and cryogenic temperatures, and the results indicate that the NDA cryogenic tunnel satisfied the assigned specifications, and has sufficient potential to perform basic airfoil testings in a cryogenic temperature range.

Characteristics of a cryogenic wind tunnel at National Defense Academy. (Part 2). Tunnel characteristics at ambient and cryogenic temperatures.