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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。
In order to put forward the principle of quantitative design of water diversion system in advanced gravity free cooling system of ship, the concept of gravity flow is proposed with reference to the description of water pump performance, and the hydraulic performance of water diversion device is described by gravity flow and additional resistance. The calculation and analysis based on Bernoulli equation and the boundary layer equation show that the inlet of the diversion device should be perpendicular to the incoming flow and higher than the thickness of the boundary layer in order to improve the self-flowing lift. Calculation and analysis based on impulse theorem combined with three-dimensional simulation results show that, in order to balance gravity flow and additional resistance, the ratio of inlet flow velocity to velocity should be designed within a certain range. The actual ship calculation results verify the correctness of the design method.