内河多工况船机桨匹配优化设计

目的]内河船舶在航行时存在顺水、逆水和急流等多种工况,传统的内河船舶船?机?桨匹配设计方法仅对船舶在逆水上行时进行了匹配设计,而在顺水下行工况,因船舶推进效率低、主机利用率低,造成油耗成本高、经济性较差等,因此需进行多工况内河船舶船?机?桨匹配优化设计.方法]首先,在不同工况下对内河船舶推进系统的各参数进行设计,并...

Optimal design of ship-engine-propeller matching for inland ships under multiple operation conditions

Objective]There are multiple operation conditions for ships navigation in inland river waterway,such as sailing downstream,upstream as well as in rapid stream,but the traditional ship-engine-propeller matching method can only ensure that the inland ships meet the design requirements when they travels upstream.Under downstream conditions,the ship propulsion’s efficiency and energy utilization rate of main engine are both low,resulting in high fuel consumption and less cost-effectivness.To this end,the optimal design of ship-engine-propeller matching for the inland ships under multiple conditions is carried out.Methods]First,the parameters of an inland ship’s propulsion system under various conditions are designed,and the results are compared to ascertain the influence of each design parameter on the overall propulsion system.Then,the design process of the propulsion system is analyzed,and a mathematical model is established with navigation cost and propulsion system efficiency as the objective functions,and the design parameters of the propeller,main engine power and ship speeds(upstream&downstream)as variables.Finally,the main engine power and design parameters of propulsion system are determined balancing both economy and efficiency using the NSGA-II algorithm.Results]The design parameters obtained using this method are easily adapted to the traffic environment of inland ships,making them more economical.Conclusion]The results of this study can not only provide design tools for the selection of ship propulsion systems,but also provide a theoretical basis for its practical application.