Development of Marine Propellers with Improved Cavitation Performance

开发具有改进空化性能的船用螺旋桨

基本信息

批准号：
59850074
负责人：
KATO Hiroharu
金额：
$ 9.02万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1984
资助国家：
日本
起止时间：
1984 至 1985
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-59850074/
关键词：
Propeller Cavitation Surface Force Erosion Boundary Layer 有限幅翼

项目摘要

New marine propellers with improved cavitation performance were developed by using two-dimensional foil section design theory and lifting surface theory. Moreover, both calculation and experiment on propeller boundary layer and finite-span foil were performed as related research. The following conclusions were obtained.1. In order to diminish cavity volume, propellers with flat pressure distribution were developed. The experiment using both the new and conventional MAU type propellers showed that cavity volume of the new propellers reduced to 1/2-1/3 of that of the MAU type one, and the fluctuating pressure became about half of that due to the MAU type one.2. Since the load distribution of the propellers with the above-mentioned pressure characteristics becomes higher in the aft part of the blade section, the thrust becomes lower than the calculation unless carefully designed.3. In order to stabilize sheet cavity, a propeller with triangular pressure distribution was developed when a M … More AU type propeller generates cloud cavitation. The cloud cavitation was not observed on the new propeller, and the paint test showed that the paint peeling off which was observed in thr case of the MAU type propeller was not observed.4. A calculation scheme where target pressure distribution can be realized with relatively high accuracy was developed.5. A theoretical calculation method of boundary layers on propeller blade was developed, using quasi-three-dimensional approximation. This method can be said very promising sinve the calculated results could show the difference of the propeller boundary layer characteristics observed in the experiment although quantitative agreement with the experiment is not sufficiently high in the present stage.6. Adequacy of the concept of equivalent two-dimensional foil was verified from theoretical calculations on various finite-span foils. Moreover, some simple equations were proposed in order to obtain modified equivalent two-dimensional foil whose thickness is reduced than that of the equivalent two-dimensional one so as to make the calculation accuracy higher. Less

使用二维箔截面设计理论和提升表面理论开发了具有改善空化性能的新海洋螺旋桨。此外，对螺旋桨边界层的计算和实验均作为相关研究进行。得出以下结论1。为了减少空腔体积，开发了具有平坦压力分布的螺旋桨。使用新的和常规的MAU型螺旋桨的实验表明，新螺旋桨的腔体积降低至MAU一级型的1/2-1/3，而波动的压力由于一型毛毛含量而变成了一半。由于具有上述压力特性的螺旋桨的载荷分布在刀片截面的后部变得更高，因此除非经过精心设计，否则推力将低于计算。3。为了稳定板腔，具有三角形压力分布的螺旋桨……更多的AU型螺旋桨会产生云空腔。在新的螺旋桨上未观察到云的空化，并且油漆试验表明，未观察到在MAU型螺旋桨的情况下观察到的油漆剥落。4。一个计算方案可以以相对高精度来实现目标压力分布5。使用准三维近似，开发了螺旋桨叶片上边界层的理论计算方法。可以说，这项方法非常承诺罪过，计算出的结果可能表明在实验中观察到的螺旋桨边界层特征的差异，尽管与实验的定量一致性在当前阶段不足。6。通过对各种有限型箔的理论计算，验证了等效二维箔概念的充分性。此外，提出了一些简单的方程式，以获得修改的等效二维箔，其厚度比等效二维的箔降低了，以使计算精度更高。较少的