电驱动喷水推进器的设计与仿真研究[范文]

 摘 要​​

喷水式推进器相较于传统的螺旋桨推进器具有抗空泡能力强，在高速时推进效率高的优点，所以在高速船舶上的运用越来越广泛。但是喷水式推进器也存在着轴系过长，需要专门的空间安放动力机，以及倒向需要专门的倒航装置等问题。针对喷水式推进器中存在的这些问题，本文借鉴吊舱式电力推进系统的结构提出了一种新的电驱动喷水推进器。

在本文提出的电驱动喷水推进器中，将高速电机和导叶轮毂做成一个整体然后直接置于流道中，通过减速装置推动叶轮转动。本文根据这一方案，对新的电驱动喷水推进器的整体结构进行了设计。

本文中的电驱式喷水推进器采用轴流泵进行设计，按照一般轴流泵的设计方法采用升力法对电驱动喷水推进器进行了水力设计。

运用CFD技术对设计的喷水推进器进行数值仿真，研究了这种新型结构对喷水推进器外特性的影响，并研究了叶轮叶片安放角以及支撑板对喷水推进器的影响，结果表明：本文提出的电驱动喷水推进器可以达到一般轴流泵的水平，但是其高效区窄，并且效率最高点会向低流量区转移，另外叶轮叶片安放角对泵的扬程有很强的影响，支撑板等结构也是造成电驱动喷水推进器效率下降的原因之一，但因此造成的效率不大。

关键词：喷水推进器；电驱；无轴

ABSTRACT

With the development and the utilization of the ocean, the demand for high-speed ships is increasing day by day. Compared with the propeller, the water-jet propulsion has the advantages of strong cavitation resistance and high efficiency at high speed and water-jet propulsion is becoming more and more widely used in high-speed ships. But the water-jet propulsion also has some problems, such as the long shafting, space for power machine and the need for a astern system. To solve the problems of the water-jet propulsion, the paper use for reference the structure of POD electric propulsion system and propose a new type of no-shaft electric drive water-jet propulsion system.

In the no-shaft water-jet propulsion system, the high-speed motor and the guide vane hub are made into a whole and it is directly placed in the flow path. Then the impeller is driven by a reduction device.

The paper use axial flow pump to design the water-jet propulsion. And the water-jet propulsion is carried out by lift method according to the design of general axial flow pump.

Numerical simulation of the water-jet propulsion is made by using CFD technology and the paper study the influence of the new structure on the efficiency of the water-jet and the influence of the other parameters are studied. The results show that the efficiency of the new water-jet system will decrease and we can reduce the efficiency loss of the propeller by optimizing the structure of the water-jet. Then the highest efficiency will shift to low flow areas and the design should be adjusted.

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