Numerical Simulation Of Ventilation And Heat Dispersion For The Flow-bulb Hydrogenerator

The ventilation and heat dispersion's calculation of the hydrogenerator is one of the most design contents, and they are directly related to the life of generator and the reliability of operation. In the past, when the heating problem of hydrogenerator was concerned, the temperature field was individually solved regardless of the interactions among thermal source, ventilation structure, temperature and its distribution. In this paper, a synthetically algorithm related to the ventilation and heat of an electric machine is adopted. The research in this paper is very important to raise material utilization during the machine design and manufacture and reliability during the operation of the machine.The content of this paper is:1. The research on synthetically algorithm related to the ventilation and heat of an electric machine is developed. The three-dimensional model of the ventilation system and the three-dimensional temperature field model of stator were constructed separately on the considering area, and the surface heat transfer coefficient calculation of the temperature field was taken as a medium to the two models, thereby the synthetically algorithm process of the ventilation and heat dispersion was built.2. The flow field of the ventilation system for the flow-bulb hydrogenerator was simulated by applying the CFD software FLUENT. Using the standardκ-εturbulence model as the physical model, a three-dimensional model for the ventilation system of the flow-bulb hydrogenerator was constructed, and the reliability of numerical simulation was validated by comparing the simulated results of the air distribution with the measured data from the electrical machine. The research indicates that the ventilation system of the flow-bulb hydrogenerator can be accurately simulated by CFD, which provides basis for the design and the optimization of the ventilation system of the flow-bulb hydrogenerator. The velocity of air in the electrical machine will be used as initial condition in the calculation of the three-dimensional temperature field of stator.3. The three-dimensional temperature field of stator for Flow-bulb Hydrogenerator was simulated by applying the FEA software ANSYS. According to the characteristics of the ventilation structure, the finite-element model of the temperature field calculation was constructed. The model was transformed to the finite element model by the Vsweep way. The surface heat transfer coefficient can be calculated by using the velocity of air in the electrical machine which was known in numerical simulation of the ventilation system. The reliability of numerical simulation was validated by comparing the simulated results of the temperature field with the measured data from the electrical machine.