Helical rotor is the most important part of rotor flow meter, and its section shape is normally formed by involute and cycloid.
螺旋转子是转子流量仪表中的心脏零部件，其截面形状一般由渐开线和摆线组合而成。
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It comes just six months after Norway promised the world's largest wind turbine, with its 145 meterrotor diameter, to be built and contributing to the country's power grid by 2011.
Practical problems concerning direct current measurement in very shallow water including the dynamic equation and performance of a rotor type current meter are discussed in this paper.