| 1. | This technique can effectively improve the cavitation performance and resolve the design problem of propeller operating in unsteady flow field
能有效地改善非均匀流场中螺旋桨的空泡性能。解决了非均匀流场中螺旋桨设计问题。 |
| 2. | This paper adopts the theoretical method to research the problem on the performance prediction and the design of the propeller operating in ship wake systematically
本文采用理论方法系统地研究了非均匀流场中螺旋桨性能预报和理论设计问题。 |
| 3. | Experimental result shows that the non - uniform flux of open channel is single - valued corresponding to the opening angle of the plate and water depth in front of the plate , and satisfies the dualistic function
通过试验可知：细长板开启角度、明渠非均匀流流量与板前水深三者单值对应，并满足二元函数的变化关系。 |
| 4. | When the propeller operates in the spatially non - uniform velocity field behind the ship , the unsteady cavitation on the blades often causes the vibration of ship structure , the propeller noise and the cavitation erosion on the blade
在船尾非均匀流场中工作的螺旋桨，常常由于桨叶上产生了非定常空泡，导致船尾振动和螺旋桨噪声，致使桨叶表面出现空泡剥蚀。 |
| 5. | This paper presents a design method of propeller blade section operating in non - uniform flow field and an idea of equivalent operating curve with unchanged cavitations characteristic on blade section , the method for selecting the curve is set up
摘要给出了非均匀流场中螺旋桨桨叶剖面的设计方法，提出了保持剖面空泡特征不变的等效运转曲线的思想，并创建了等效运转曲线的确定方法。 |
| 6. | To avoid or reduce these trouble induced by the unsteady cavitation , the theoretical design method for propeller and the blade section with the good cavitation performance are adopted to enlarge the cavitation bucket width and control the range and type of the cavitation on the blade . this enables propeller to operate in the non - uniform ship wake rather well
为了避免或减缓空泡带来的危害，采用螺旋桨理论设计方法和空泡性能优良的桨叶剖面来增加空泡斗宽度和控制桨叶空泡范围及空泡类型，以适应非均匀流场中螺旋桨工作的需要。 |
| 7. | Part ii : a third possible mechanism for the effect of nonuniform current on short waves is suggested , which ascribes the modulation of short wave spectrum by current to that the current changes the drift , through which it changes the breaking criteria , as a result the energy dissipation is altered
第二部分:本文提出非均匀流场影响短波谱的第三个可能机制:非均匀流场通过对表面漂流的调制，改变风浪破碎的闭值条件，进而改变破碎损耗，从而调制海面小尺度粗糙度。 |
| 8. | The lifting - line and lifting - surface design method , the harmonic analysis method based on the panel method , new section design ways , the effective operating curves are integrated into a whole design system of the unsteady propeller , the design system is effective and reliable by the design example , the model test and the application to the full scale ship
本文把升力线和升力面设计方法、基于面元法预报螺旋桨非定常性能的谐调分析方法，新剖面设计方法、有效运转曲线计算方法组合为一套完整的非均匀流场中螺旋桨设计计算系统，经实例设计和模型试验及实船的应用，该设计系统是可靠且有效的。 |
| 9. | So far as the aqueduct with large discharge and lower head is concerned , the non - uniform flow will occur in the aqueduct , when the discharge is enlarged after the water - carrying section being determined based on the design discharge and the given head ; for which the flow condition must be presumed , so as to determine the water surface profile
摘要大流量低水头渡槽根据设计流量和给定水头确定过水断面后，通过加大流量时，渡槽内就会发生非均匀流，需对这种水流情况进行推算，以确定渡槽在通过加大流量时的水面线。 |
