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首页> 外文期刊>Ocean Engineering >Experimental investigation of single blade loads by captive model tests in pure oblique flow. Part Ⅱ: Propeller in-plane loads and preliminary comparison of single blade loads during transient phases
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Experimental investigation of single blade loads by captive model tests in pure oblique flow. Part Ⅱ: Propeller in-plane loads and preliminary comparison of single blade loads during transient phases

机译：纯倾斜流动俘虏模型试验对单叶片载荷的实验研究。 第二部分：螺旋桨在瞬态阶段内单叶片载荷的平面载荷和初步比较

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Off-design and realistic operative conditions of the propulsion system have been progressively considered a frontier topic for the development of novel and successful design procedures. The availability of high accurate data on propeller performance, both experimental or numerical, is pivotal for the development of reliable tools and the enhancement of traditional ones. In this context, this paper continues the investigation described in (Ortolani et al., 2020), that was dedicated to analyze the single blade loads obtained by oblique towing tests and assess their consistency with those measured during the steady turning phase, reproduced by free running model tests. In this paper, the same analysis is broadened to two aspects. At first, the in-plane forces and moments that are obtained by a conversion from the rotating frame of the measure to the fixed frame are discussed. These loads need quantification, because they are the primary cause of damages of the shafting structure, vibratory loads and also contribute to dynamic response of the ship. Then, the study is switched to the comparison of single blade loads during transient motions of the turning maneuvers, at weak and tight rudder angles, performed at the same reference speed as the captive model test. The analysis lays the basis for the enhancement of ship system (comprehensive) mathematical models, already used in ship design, to real-time analysis of vibratory loads and emitted noise.
机译：推进系统的偏离设计和现实的手术条件已经逐步被认为是开发新颖和成功设计程序的前沿主题。关于螺旋桨性能的高准确数据的可用性，两种实验或数值都是可靠的工具和传统工具的增强的关键。在这种情况下，本文继续进行（Ortolani等，2020）中描述的调查，该调查专用于分析通过斜牵引试验获得的单个叶片载荷，并评估它们在稳定转弯阶段测量的那些稠度，通过自由再现运行模型测试。在本文中，相同的分析扩大到两个方面。首先，讨论了通过从测量旋转框架到固定框架的转换而获得的面内力和矩。这些负载需要量化，因为它们是轴系结构损坏，振动载荷的主要原因，并且还有助于船舶的动态响应。然后，将研究切换到在转动运动的瞬态运动期间的单叶片载荷的比较，以弱和紧密的舵角，以与俘虏模型测试相同的参考速度执行。该分析为船舶设计中已经使用的船舶系统（全面）数学模型提高了基础，对振动载荷和发出噪声的实时分析。

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