| Most city water pipelines lies below the city ground, in order to improve management of the water transportation, the water companies install many sensors along the pipeline. Due to the limitation of the traditional batteries, its needs to be frequently replaced, however, the manufacture of the battery will cause lots of environmental problems, leads to the pollution of the surrounding environment; more serious is that many pipeline lies in the place where human race are hard to reach or no man were lived, the battery replacement costs will be much higher, besides some of the water sensor could not get access to the local power line. What’s more, some of the water pipe network will be through some bad neighborhoods, traditional batteries could not tolerate such harsh conditions.In this paper, a micro pipe flow generator system was designed, its purpose is to power the sensor in the water pipeline. We use finite element analysis software ANSYS to design the structure of the pipe flow generator system, and by comparing the simulation results of different hydraulic turbine structure, choose an optimal structure, besides by analysis of the generator that connected to the water turbine, the results showed that the water does not affect the normal transmission case, through the use of kinetic energy of the fluid inside the water pipe in the form of electricity to meet the power needs along the sensor.Firstly, according to the overall structure of the pipeline flow power generation system, the whole system was divided into turbine prime mover, generator, and rectifier circuit. According to the characteristics of the pipeline installation environment, we selected horizontal axis turbine, permanent magnet synchronous generator and capacitor filter three-phase uncontrollable bridge rectifier circuit as the object of this paper, the generator was driven by the coaxially connected water turbine, thus provided the AC power to the rectifier circuit, in the end, the rectifier circuit transfer the AC to DC, and supply the electrical equipment.Second, introduced the basic theory and general design method of water turbine design. The turbine design was based on computational fluid dynamics, by using the fluid analysis module of the finite element analysis software ANSYS, the simulation of the water turbine was tested. In this paper, the turbine model was built by BladeGen, then the finite element meshing was carried by turbine cascade channel meshing module TurboGrid, and the generated grid file was import to the fluid mechanical analysis module of ANSYS CFX-Pre, CFX-Pre will load the boundary conditions for the turbine and run its simulation. Finally, through integration of the simulation of the three parts series, meet the requirements of the generator turbine engine model.Third, due to the limited space in the pipeline and electricity demand characteristics, we proposed the use of a permanent magnet synchronous generator as a generator model used herein. First, based on the basic theory and operation principle of the permanent magnet synchronous generator, together with design features of the finite element electromagnetic simulation software Maxwell, the certain structure and parameters of permanent magnet generator were selected or calculated, and then the results was imported into RMxprt software for rapid analysis and optimization calculation.Finally, through the two-dimension finite element simulation of the Maxwell 2D, results show that the designed permanent magnet synchronous generator can be successfully output less volatile three-phase alternating current; then the whole generator-load system were connected by generator and rectifier circuit, among them the type of the circuit was capacitor filter three-phase uncontrollable bridge rectifier circuit. The result shows that the permanent magnet synchronous generator with some odd harmonics of the AC waveform in the rectifier external circuit can output steady DC waveform after rectifying, thus satisfy the needs of the DC electric equipment inside pipeline. |
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