1. Ahmadi BM, Carriveau R, Ting DS, 2016. A wind tunnel study on the aerodynamic interaction of vertical axis wind turbines in array configurations. Renewable Energy, 96(A), 904–913. DOI: 10.1016/j.renene.2016.05.060
2. Akin MB, Sanz W, 2014. The influence of transition on CFD calculations of a two-stage counter-rotating turbine. Amer Soc Mechanical Engineers, Dusseldorf, 235–249.
3. Ang KH, Chong G, Li Y, 2005. PID control system analysis, design, and technology. IEEE Transactions on Control Systems Technology, 13(4), 559–576. DOI: 10.1109/TCST.2005.847331
4. Baughman JL, Orlando RJ, Moniz TO, 2004. Variable torque split aircraft gas turbine engine counter rotating low pressure turbines. U.S. Patent 6763652 B2. General Electric Company, Schenectady, 1–2
5. Cai Ruixian, 1992. Basic analysis of counter-rotation turbines. Acta Aeronautica et Astronautica Sinica, 13(1), 57–63. (in Chinese) DOI: 10.3321/j.issn:1000-6893.1992.01.009