单项选择题
进口气流旋绕调节Air inlet winding regulation原理principle:()
A、在离心压缩机叶轮进口前装有可绕叶片本身轴线转动的导向叶片,当导向叶片沿不同方向转动某一角度时,进入叶轮的气流将产生旋绕后进入叶轮,有两个方向Before the inlet of the impeller of the centrifugal compressor, there is a guide blade that can rotate around the axis of the blade itself. When the guide blade rotates at a certain Angle in different directions, the airflow into the impeller will be rotated and then enter the impeller in two directions
B、正旋绕:压比与流量减小Forward winding: pressure ratio and flow rate decrease
C、负旋绕:压比、流量增大Negative winding: pressure ratio, flow rate increase
D、以上都不对