"A STUDY OF INTERACTION EFFECT BETWEEN TWO DIMENSIONAL WAVE DEVOURING PROPULSOR AND HULL"

“二维吞浪推进器与船体相互作用效应研究”

• 批准号: 04805042
• 负责人: TERAO Yutaka
• 金额: $ 1.47万
• 依托单位: TOKAI UNIVERSITY, SCHOOL OF MARINE
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04805042/
• 关键词: Wave Devouring Propulsion; Wave Energy; Interaction between hull and hydrofoil in waves; 波浪エネルギー; 推力発生

The Wave Devouring Propulsor (WDP) is a device which converts wave energy to the trust. The idea of WDP was proposed by the head researcher of this project and tested experimentally in 1986. In 1989 and 1990, actual sea trial was conducted and succeeded using a small vessel with WDP.WDP main structure is a hydrofoil located under the ship bow which generates thrust and also restricts the hull motion as a damper. Therefore the WDP system decrease the resistance increase in waves and improve the propulsive efficiency in waves and sea kindness. This device will save the energy about up to 50% at the feasibility study.Nevertheless the research of this system is not developed now. Especially interaction effect between WDP and hull was not clear. The researcher tried to study the interaction effect between hydrofoil and the hull.For simplify the phenomena, two dimensional model was introduced. The hull configuration was treated as a rectangular shape which is located in a center of circular calculation domain. The height of free surface, right and left of the hull, changed by each calculation time steps. Using the potential theory and boundary element method, this problem was formulated. To simulate the thrust generated by the foil, vortex singularity was introduced in the calculation domain which covered the surface of the foil at the uniform strength and shedded at the trailing edge at he each time steps and moved with induced velocity.To solve the problem, time step calculation was necessary. Therefore high speed calculation algorithm was developed using newly introduced EWS.From the numerical calulation, the interaction depends on the foil depth.

吞噬波浪推进器（WDP）是将波浪能转化为信托的装置。 WDP的想法是由该项目的首席研究员提出的，并于1986年进行了实验测试。1989年和1990年，使用装有WDP的小型船舶进行了实际海试并取得了成功。WDP的主要结构是位于船艏下方的水翼，产生推力，并作为阻尼器限制船体运动。因此WDP系统减少了波浪中的阻力增加，提高了波浪中的推进效率和海况。经可行性研究，该装置可节能50%左右。但目前该系统的研究尚未开展。尤其是WDP与船体之间的相互作用效果尚不明确。研究人员试图研究水翼与船体之间的相互作用效应。为了简化现象，引入了二维模型。船体结构被视为位于圆形计算域中心的矩形形状。船体左右自由表面的高度，随每个计算时间步长而变化。利用位势理论和边界元方法，对这个问题进行了表述。为了模拟水翼产生的推力，在计算域中引入涡奇异点，涡奇异点以均匀强度覆盖水翼表面，并在每个时间步后缘处脱落，并以诱导速度移动。为了解决这个问题，需要进行时间步计算。因此，使用新引入的EWS开发了高速计算算法。从数值计算来看，相互作用取决于箔深度。