Research And Theoretical Analysis Of Ultrasonic Vortex Anemometer

As an important part of measuring fluent, measuring wind velocity has set a close relation with people's ordinary life. In ancient times, Chinese had made use of the reed and flag in wind to estimate wind velocity, and which has been applied widespread in the field of aerospace, scientific research, modern agriculture, meteorology and so on by the development of modern science and technology.To meet the demand in every field, scientific research personnel has developed various and characteristic anemometers. According to the measuring principle, The instruments could be differentiate with Runner(Wind Cup and Rotary Paddle), Thermal, Hotline, Ultrasonic, Pitot tube, about decades of varieties, and the vortex anemometer, which was made through the principle of vortex generator, has been applied extensively because of much advantages, such as wide measuring range, without activities loss components, carrying easily and so on.The major content of this article is about how to develop an ultrasonic anemometer with new vortex generator, improve the performance of low Reynolds number, expand the prescribed minimum of range, and conquer the disadvantages in measuring low wind velocity of the vortex anemometer on sale.This article includes some researches as follows:1. Combined with the current situation of vortex anemometer in domestic and abroad, to put forward some research points and something need to be improved , and then design a whole scheme.2. Infer the stability of vortex flow in theory, and analyse in detail about the function of important parameter——Strouhal number S_r.3. The author designs a new vortex generator in order to conquer the disadvantages in traditional one, whose performance was not well in low Reynolds number, at the same time, he prove the new production's advantages in theory according to the basic law in Hydrodynamics.4. Set up a vortex flow model by use of the GAMBIT, and utilize the FLUENT to make a numeral emulation, compare some different vortex flow, and finally, test the conclusion of theory analyse.5. Research about how to design and manufacture the instrument's shell, the signal processing circuit.6. Make an experiment, testing the performance and get some parameter based on the experiment.