One technical difficulty is cavitation, where low pressure behind a turning blade causes air bubbles.
一个技术难题是气穴现象，一旦发生气穴现象，位于旋转螺旋桨叶后方的低压会产生气泡。
The cooling effectiveness of pressure side of blade was higher than suction side.
层板叶片压力面的冷效略高于吸力面。
The cooling effectiveness of pressure side of blade was higher than suction side.
层板叶片压力面的冷效略高于吸力面。
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