Dimensionless Numerical Approaches for the Performance Prediction of Marine Waterjet Propulsion Units
Dimensionless Numerical Approaches for the Performance Prediction of Marine Waterjet Propulsion Units
复制标题
DOI：
10.1155/2012/321306
复制
发表时间：
2012-06
影响因子：
0.9
通讯作者：
M. Altosole;G. Benvenuto;M. Figari;U. Campora
中科院分区：
文献类型：
--
作者：
M. Altosole;G. Benvenuto;M. Figari;U. Campora
高速船早期设计阶段的关键问题之一是推进系统的选择和性能预测，因为现阶段有关船舶的信息很少。这项工作的目的正是为喷水推进器的设计者提供一个简单可靠的计算工具，能够预测设计和非设计条件下的喷水推进器工作点，从而在船舶设计过程中研究多种推进方案。在本文中，提出了两种原始的无量纲数值程序，一种涉及海军应用的喷气装置，另一种更适合滑行船。第一个程序基于混流泵的通用性能图，该图是通过应用液压机的相似原理对多个喷水泵进行分析得出的。第二种方法通过与当前水射流装置的一些比较进行了验证，该方法基于完整的物理方法，作者从中得出了一组无量纲水射流特性。所提出的应用实例表明了所提出的喷水推进系统性能评估方法的有效性和准确性。
One of the key issues at early design stage of a high-speed craft is the selection and the performance prediction of the propulsion system because at this stage only few information about the vessel are available. The objective of this work is precisely to provide the designer, in the case of waterjet propelled craft, with a simple and reliable calculation tool, able to predict the waterjet working points in design and off-design conditions, allowing to investigate several propulsive options during the ship design process. In the paper two original dimensionless numerical procedures, one referred to jet units for naval applications and the other more suitable for planing boats, are presented. The first procedure is based on a generalized performance map for mixed flow pumps, derived from the analysis of several waterjet pumps by applying similitude principles of the hydraulic machines. The second approach, validated by some comparisons with current waterjet installations, is based on a complete physical approach, from which a set of non-dimensional waterjet characteristics has been drawn by the authors. The presented application examples show the validity and the degree of accuracy of the proposed methodologies for the performance evaluation of waterjet propulsion systems.