Greenhouse is an important place for crop growth, and it is necessary to control the temperature of growing environment in winter. In addition, the root tempera
Contra-rotating small-sized axial fans are used as cooling fans for electric equipment. In the case of the contra-rotating rotors, the blade row distance betwee
A compression wave is generated ahead of a high-speed train, while entering a tunnel. This compression wave propa- gates to the tunnel exit and spouts out as a