船艉裝置渦流翼之RD542_0貨櫃輪模型尺寸推進計算

Propulsion Prediction of Container RD542_0 with Vortex Fin Installed near Stern at Model Scale

范直宏(Jhih-Hong Fan)

指導教授 ： 趙修武

中原大學/工學院/機械工程研究所/碩士(2009年)

https://doi.org/10.6840/cycu200900259

摘要

本文使用有限體積法求解雷諾平均化之連續方程式、涅維爾-史托克方程式以及紊流模型，運用區塊式網格技術建構渦流產生翼周圍網格，同時基於雙船體模型假設，計算船舶周圍的紊流場。本文藉由等效物體力模型模擬螺槳效應，得以計算船舶推進性能。本文主要針對RD542_0貨櫃船為標的，在模型尺度下進行有系統的船舶艉流場計算，分析不同渦流產生翼對於RD542_0貨櫃船推進性能的影響，以獲得適當的渦流產生翼外型，期望達成船舶節能的目的。本研究結果發現，不論在左右兩側同時裝置渦流產生翼或是僅在右舷裝置渦流產生翼，當渦流產生翼角度相對於原始角度增加正攻角時，在船艉螺槳面上方的流體並不會產生額外吸入效應，無法達成減低馬力需求的效果。若當渦流產生翼角度相對於原始角度增加負攻角時，在船艉螺槳面上方的流體會產生額外吸入效應，此時渦流產生翼產生的預漩流效應得以被螺槳有效的吸收，才有可能減低馬力需求，達成節能的效果。

關鍵字

貨櫃輪 ； 推進性能 ； 渦流產生翼

並列摘要

Based on the double-model assumption, where the time-averaged continuity and Navier-Stokes equations are solved incorporated with k-w model by finite volume discretization with multi-block grid topology, the influence of vortex fin on the propulsion performance of container ship RD542_0 is studied at modle scale. For the purpose of designing a proper vortex fin to meet the energy-saving requirement, systematic calculations based on different geometrical parameter sets describing the surveyed vortex fins, such as location, orientation, size and number of vortex fins, are conducted to investigate the influences of vortex fin installment on the propulsion characteristics. The numerical results indicate that the increase of the angle of attack of vortex fin, resulting in induced flow flowing out of the propeller plane, where the rotational energy created by the vortex fin is not effectively absorbed by the propeller, leads to power increase at modle scale despite of the installment of vortex fin at starboard or both sides. In contrast, decreasing the angle of attack of vortex fin, resulting in induced flow flowing into the propeller plane, where the rotational energy created by the vortex fin can be effectively absorbed by the propeller, leads to possible power decrease at modle scale.

並列關鍵字

vortex fin ； propulsion performance ； container ship

參考文獻

6. Chou, S.K, Chen, W.C., Hsin, C.Y., Chau, S.W., “Computations of ship Flow around Commerical Hull Form with Free Surface or Propeller Effect”, Journal of SNAME, R.O.C., Vol.21, NO.1, pp.27-36, 2002

11. 黃振旗，「斜航狀況下KVLCC2M周圍流場計算」，中原大學碩士論文，2005。

5. Chau, S. W., Chou, S. K., Chen, W. C., Chen, B. F., Tsai, K. J., Lee, J. E., “Study on the Wake Variation of a Handy-Max Container Ship for Different Vortex Generator Installed near Ship Stern,” The 13th Symposium of Society of Naval Architects and Marine Engineers, R.O.C., Taipei, 2001.

7. Shah, K., Ferziger, J. H., Large eddy simulation of flow over a cube attached to a channel wall, J. Fluid Mech, 1995.

9. Briggs, D. A., Ferziger, J. H., Koseff, J. R., Monismith, S. G., “Entrainment in a Separated Free Turbulent Mixing Layer,” Journal of Fluid Mechanics, vol. 310, pp. 215-241, 1996.