裝置渦流產生器之RD542-0貨櫃輪流場計算分析研究

Ship Flow Calculation of Container RD542-0 with Vortex Generator Installed

許明凱(Ming-Kai Hsu)

指導教授 ： 趙修武

中原大學/工學院/機械工程研究所/碩士(2007年)

https://doi.org/10.6840/cycu200700731

摘要

本文使用計算流體力學方法，利用有限體積法求解雷諾平均之涅維爾-史托克方程式以及紊流模型，並運用區塊式網格技術建構渦流產生器周圍網格，基於雙船體模型假設計算船舶周圍的紊流場。主要針對RD542-0貨櫃船為標的，進行有系統的船舶艉流場計算分析，分析不同渦流產生器對於RD542-0貨櫃船阻力性能與螺槳面上切向速度分佈的影響，以建議適當的渦流產生器外型，期望達成船舶節能的目的。
本研究結果發現，在左右兩側裝置對稱渦流產生器時，當渦流產生器角度增加，在船艉所產生加速效果較顯著，但是總阻力值也會增加。使用平順之渦流產生器，因可消除渦流產生器產生之翼尖局部渦漩，在船艉所產生的加速效果有進一步增強。將渦流產生器向下移動，因為裝置位置不佳，所以造成負面效果。將該渦流產生器長度增加一倍後，船艉流場速度可明顯提升，同時使總阻力值降低。若僅在右舷裝置渦流產生器時，因為左右舷流量不平衡，造成左右舷壓差、阻力係數以及加減速效果都不同，總阻力值反而比對稱船型高。

關鍵字

渦流產生器 ； 貨櫃船

並列摘要

This study computes the turbulent double-model flow of a container ship RD542-0 equipped with vortex generators via the techniques of computational fluid dynamics, where the time-averaged Navier-Stokes equations are solved by a finite volume discretization and a multi-block grid is employed to discretize the computational domain around ship. For the purpose of designing a proper vortex generator to meet the energy-saving requirement, systematic calculations based on different geometrical parameter sets describing the surveyed vortex generator, such as location, orientation size and number of vortex generator, are conducted to investigate the influences of vortex generator installment on the resistance characteristics and velocity distribution on the propeller plane.
For ships with vortex generators symmetrically installed at both sides, our numerical results show that the increase in the angle of vortex generator leads to substantial flow acceleration near stern, which is unfortunately accompanied with the increase of total resistance. The smoothing of vortex generator helps to reduce the total resistance and to further improve the flow acceleration near stern, mainly due to the elimination of local tip vortex of vortex generation through the shape modification of vortex generator. A lower location of vortex generator results in negative impacts on resistance and flow characteristics, where the vortex generator suffers from slow incoming flow with small angle of attack. After doubling the length of vortex generator at the previous location, effective flow acceleration at stern and smaller resistance are obtained. For ships with only on vortex generator at the starboard side, the total resistance is always larger than that of ship with vortex generators symmetrically installed at both sides, which is explained by the imbalance of flow rate between the starboard and port sides.

並列關鍵字

container ship ； vortex generator