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The study of the small drag reduction testing platform

The study of the small drag reduction testing platform,10.1109/AIMSEC.2011.6009991,Gang Zhao,Yunqing Gu,Jinxing Zheng,Donglai Xia,Hualin Zhao,Liming Y

The study of the small drag reduction testing platform  
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In the experimental research of fluid friction on the ship sailing and underwater vehicle navigation, mostly by tunnel devices, but because of its complex structure, large floor area, high cost, the tunnel device in use has some limitations. Based on the above factors, a small platform was developed, which can be used for testing drag reduction effect on the bionic jetting surface. The data acquisition system on the test platform, written the graphical user interface in LabVIEW environment to control of data flow, and during the test collection the value of the surface friction torque of the fluid for different experimental models, the automation of data collection and data real-time monitoring were achieved. It has the characters of friendly interface, easy operation, and high precision of collecting data, so the test efficiency is improved and lower the cost. Turbulent friction takes great important part in the resistance of viscous fluid, and it is one of the hot topics in the field of hydrodynamics to reduce the turbulent friction (1-2).As the fluid flowing in the pipe, when the "Re" reaches 105 and turbulence intensity reaches 10%, turbulent Reynolds stress is 100 times as large as laminar viscous stress, while the greater the stress is, the greater the loss is. In the long distance fluid transportation in oil-gas-pipelines, almost all of the power that pumping station provides was used to overcome the shin friction of fluid (3). In the field of fluid transportation, the skin friction resistance of ship takes up 50% of the total resistance, while in submarine this ratio is up to 70% (4).Currently, the drag reduction test method is mainly studied form the following methods: Theory analysis, value simulation, model experiment and so on. The data accuracy got from the model experiment is much more precise and closer to the reality than the ones got from theory analysis and value simulation. So a test and authentication are necessary even the theory analysis and the value simulation are done already (5).The experimental method, as an important mean of fluid drag reduction study, is playing a very important role in promoting the theory of fluid drag reduction. A large number of tests and experiments are necessary when a new hydromechanics phenomenon appears or a new hydromechanics theory is proposed (6). Water tunnel experimental device is used in the traditional researching method of fluid dynamic. This device has some shortcomings such as high cost, too huge volume, too hard for experimental condition control and too complex experimental model. There are merely a handful of water tunnel devices domestic currently. The miniature hydromechanics experimental devices we have currently are mainly used for teaching and don't have the ability of fluid friction and resistance test. So it is out of the question that it can be used for tests of drag reduction on bionic jetting surface (7). Therefore, there are many problems on how to find a simple and reliable device to evaluate the drag reduction on different surfaces and provide a reliable foundation for practical application. For the reasons above, an advanced and small drag reduction experimental platform was studied and manufactured which can evaluate fluid friction resistance. The testing platform could be effective in the testing of drag reduction technology such as bionic jetting surface, the bionic non-smooth surface, polymer coating surface. For the reasons above, an advanced and small drag reduction experimental platform was studied and manufactured which can evaluate fluid friction resistance. The testing platform could be effective in the testing of drag reduction technology such as bionic jetting surface, the bionic non-smooth surface, polymer coating surface.
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