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。
Propeller cavitation degrades propeller performance, erodes blade surfaces, produces noise, and causes vibration on the ship hull.
螺旋桨空泡会降低螺旋桨性能，产生空化剥蚀和噪声，从而导致船体振动。
To increase the head of bulb turbine, it is necessary to improve the runner blade design method and design high head bulb turbine with good energy and cavitation coefficient performance high.
欲提高贯流式水轮机的使用水头，应改进转轮叶片的设计方法，以设计出能量和气蚀性能良好的高水头贯流式水轮机。
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