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首页> 外文期刊>International Journal of Marine Engineering Innovation and Research >Cavitation Analysis of Kaplan-Series Propeller: Effect of Pitch Ratio and nProp using CFD
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Cavitation Analysis of Kaplan-Series Propeller: Effect of Pitch Ratio and nProp using CFD

机译：Kaplan系列螺旋桨的空化分析：间距比和NPROP使用CFD的影响

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摘要

cavitation is defined as a phenomenon or action of the traveling bubbles that pass through the hydrofoil in which the reduction of pressure below the liquid’s vapor pressure leads to the formation of small vapor bubbles (or cavities) caused by the dynamic pressure of the propeller blades. It caused some effects on the propeller of the ship i.e. it can greatly reduce a ship’s propelling efficiency, damaged propeller material or blade erosion, vibration, and disturbance noises. Cavitation can be minimized by proper attention regarding the design of the propellers and variation of propeller variables parameters. For that reason, this research conducts a cavitation analysis on the Kaplan-Series of the CPP by varying P/Db=0.4, P/Db=0.6, and P/Db=0.8; also the rotational speed of the propeller (nProp) i.e. 125 rpm, 175 rpm and, 225 rpm. The numerical analysis was made based on the Computational Fluid Dynamic Method (CFD) to calculate the pressure ratio (ΔP) and percentages of the cavitation area (Rs) due to a configuration of the propellers parameter. The simulation consists of the 3 steps; pre-processor, solver manager, and post-processor. The result shows that the value of the pressure ratio increased significantly at the higher P/Db and nProp. Also, the variation of P/Db and nProp has a significant effect on the development of Rs (%) at the higher P/Db and nProp.
机译：空化被定义为行驶气泡的现象或作用，其通过水陶器，其中液体蒸汽压力以下的压力降低导致由螺旋桨叶片的动态压力引起的小蒸汽气泡（或腔）的形成。它对船舶的螺旋桨引起了一些影响，即它可以大大减少船舶推动效率，损坏的螺旋桨材料或叶片侵蚀，振动和干扰噪声。通过适当地关注螺旋桨的设计和螺旋桨变量参数的变化来最小化空化。因此，该研究通过改变P / DB = 0.4，P / DB = 0.6和P / DB = 0.8对CPP的Kaplan系列进行空化分析。此外，螺旋桨（NPROP）的转速（NPROP）即125rpm，175rpm和225rpm。基于计算流体动态方法（CFD）进行了数值分析，以计算由于螺旋桨参数的配置而计算空化区域（RS）的压力比（ΔP）和百分比。模拟包括3个步骤; Pre-Prodardor，Solver Manager和后处理器。结果表明，压力比的值在较高的P / DB和NPROP中显着增加。此外，P / DB和NPROP的变异对较高P / DB和NPROP的RS（％）的开发具有显着影响。

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