Numcrical Simulation Of Flow Field On Ventilation System Of Flow-bulb Hydrogenerator

Along with the water and electricity enterprise fast development, specially the low flood peak hydro-electric resources vigorously development, the large-scale Flow-bulb Hydrogenerator obtained the rapid development. Along with single plane capacity enlargement, the electrical machinery electromagnetism load and the heat load also along with it enhancement, it give off heat with the cooling question research appear day by day importantly, it directly will affect the Flow-bulb Hydrogenerator the service life and moves the reliability. The large-scale flow-bulb throughflow water turbo generator, as a result of the arrangement as well as the structure particularity and the complexity, the fan cooling difficulty, the rotor revolving function, causes the gas in to decide, between the rotor flow form in addition becomes extremely complex, to its giving off heat with the cooling computation research, will be helpful to the unit fan cooling system design and the movementThe thermal field of Flow-bulb Hydrogenerator lies on the distributions of cooling material and electromagnetic losses. In this paper, to gain accurate thermal field, the rotary fluid field and thermal field of stator are calculated through conjugate heat transfer method.Based on the analysis on ventilation system, the calculation region of rotary fluid field is plotted out and meshed in structured grid. According to the characteristic of cooling material, basic assumption and boundary condition are presented. The calculation is performed by finite volume method, and fluid field distribution is obtained. In order to finding more perfect fluid field parameter, the fluid fields of various inlet velocities inlet velocities are calculated.In addition, according to the structure characteristic of stator, the 3D calculation region of fluid field and thermal field is plotted out and meshed in structured grid, and 3D mathematical models are established. Based on the analysis on cooling process of stator, basic assumption and boundary condition are presented. The results of calculation are compared respectively with the results of traditional method and measured values, which illuminates the veracity of conjugate method. The affection of cooling air quantity to stator thermal field is analyzed.