Preliminary airfoil testing experience in the NDA cryogenic windtunnel

摘要

A small two-dimensional high-speed cryogenic wind tunnel wasconstructed at the Japanese National Defense Academy (NDA) in 1985. Theauthors describe the present status of the NDA cryogenic wind tunnel andgive some preliminary airfoil testing results and experience. Twoairfoil models, a NACA 0012 and a R4 airfoil model, were constructed.The R4 test results were compared with those of NASA TM-85739. They werein good agreement in the negative angle of attack range. However, thepresent R4 model has an extremely small aspect ratio of 0.5 and a highsection thickness to tunnel height ratio of about 0.1. Therefore, thepresent results might be more influenced by the tunnel walls than thoseof NASA