Design of the Parameters of Generating Micro-bubble module on the Effect of Drag Reduction of Submerged Body

• Main Authors: Wei-Gang Zhang, 張維剛
• Other Authors: Sheng-Ju Wu
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/48266303781687788742

碩士 === 國防大學中正理工學院 === 造船工程研究所 === 95 === The main purpose of underwater weapons is capable of hitting fast and precisely the target. Due to the constraint on the finite space of a streamline vehicle, the underwater weapon is merely able to equip with limited in the sources of energy of propulsion except gunpowder filled. Hence, if there are some appropriate ways that can reduce the drag of underwater weapons, the consumption of energy resources will be decreased effectively. Meanwhile, there could be to improve the operating performance, increase the distance of voyage, and restrain the noise of the motion of underwater weapons. Therefore, the research of the drag reduction of submerged bodies has been being the important point of study of advanced countries. In the beginning stage, this work first focused on the study of controllable parameters for the production of the gas bubbles using the way of electrochemistry. In this work, the kinds of electrolyte, the size of area of flat piece of metals, the shape of metals, and the gap between the anode and cathode and so forth was considered to estimate the effect on the rate of the gas-bubbles generation. The relationship between the amperage and the rate of the gas-bubbles generation has been found out in the experiments; the quantity of the micro-bubbles generated can be estimated immediately. Next, the drag test on the model of submerged body applied with the module of the micro-bubbles generation is going to be measured actually in the circulating water channel; the difference between a uniform flow and a wake flow has been investigated concerning the result of the drag reduction. The new experiment device has been successfully developed to obtain the useful data instead of the results measured by the original experiment device with bad precision and large variance. The result of measuring is rather consistent with that studied in the past; moreover, the key point concerning an external flow applied with the technique of the micro-bubbles drag reduction has been successfully overcome in this study. The best rate of the drag reduction could be up to 50%.