1. Department of Aerospace Engineering, Tohoku University, 6-6-01 Aramaki-Aza-Aoba, Aoba-ku, Sendai 980-8579, Japan
2. Mechanical Systems Laboratory, Corporate Research and Development Center, Toshiba Corporation, 1 Komukai-Toshiba-Cho, Saiwai-ku, Kawasaki 212-8582, Japan
3. Institute of Fluid Science, Tohoku University, 2-2-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
4. Aeronautical Technology Directorate, Japan Aerospace Exploration Agency, 7-44-1 Jindaiji Higashi-machi, Chofu, Tokyo 182-8522, Japan