自流冷却系统引水装置水力性能研究

为提出先进船舶自流冷却系统引水装置的定量设计原则，参照水泵性能描述方法，提出自流扬程的概念，用自流扬程和附加阻力描述引水装置水力性能。基于伯努利方程和边界层方程的计算分析表明，为提高自流扬程，引水装置吸入口应垂直于来流且高于边界层厚度。基于冲量定理进行计算分析并结合三维仿真计算结果表明，为平衡自流能力和附加阻力，引水装置的入口流速与航速之比宜设计在一定区间内。实船计算结果验证了本文设计方法的正确性。

Hydraulic Performance Study on Water Inlet Device of Scoop Cooling System

Aiming for providing a quantitative design method of water inlet device of scoop cooling system, scoop lift head is defined like the conception pump lift, and the performance of water inlet device is describe by the scoop lift head in company with additional drag. According to the calculating results based on Bernoulli equation and boundary equation,height of water inlet device should be larger than the thick of ship body boundary and inlet section should be vertical to flow. According to the calculating results based on theorem of impulse and 3D computational results, the ratio of inlet flow velocity of water inlet device to ship speed should be designed in a range other than a fixed value. The presented method is employed to design a water inlet device of a real ship and the results validate the rightness of the method.