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Radial ventilation channel is a key component of large turbo generator stator, which affects the cooling of stator core and bars. The design of radial ventilation channel need simultaneously consider the flow resistance and cooling capacity. In this paper, the width of radial ventilation channel, the structure and material of support parts will be discussed to improve the cooling capacity of large...
Inner evaporative cooling way of stator bars is generally affected by circulating system and coolant. In this paper, we focus those factors to improve the capability of cooling system. Based on the flowing resistance distribution of system, the structure of components is redesigned to improve the stability and reliability of circulating flow. In the same time, different kinds of coolant are used into...
when we design immersing evaporative cooling turbo generator, How to control the temperature rise of stator bars in an appropriate situation is one of the most important parts in the unit designing. In this paper, the heat flowing paths of stator components are analyzed in the immerging stator structure. Based on the heat transfer theories, Numerical simulation model is built for the stator temperature...
In evaporative inner cooling generator, the total pressure drop in hollow conductor is composed of liquid phase and two-phase flow pressure drops. In recent researches, the two-phase flow pressure drop in hollow conductor was researched deeply and detailedly, but the liquid phase flow pressure drop was seldom researched. In fact, the liquid phase flow pressure drop is an important component of total...
In order to solve the cooling problem of the large electrical machine under special situation, the staff of IEECAS brought forward new coolant and cooling structure for spraying evaporative cooling system based on experiences of evaporative cooling electrical machine for many years. The article discusses detailed the key problems include systems structure, theory calculation and experiment. By the...
As a new generator cooling technology, the evaporative cooling technology has been researched on various aspects to a certain extent, such as the two-phase flow pressure drop, temperature distribution and etc. But there has no research reported on the two-phase flow instability in the parallel hollow conductors in the evaporative cooling system. The occurrence of two-phase flow instability phenomena...
A heat transfer calculation approach of spraying evaporative cooling is presented according to its characters using in large electrical machine. Based on the parameters of coolant, fluid and surface structure the calculation approach is confirmed, and gain the relationship between convective heat transfer coefficient and heat flux. Experiment model of spraying evaporative cooling electrical machine...
Evaporative cooling technology is an innovative technology developed in China, it is the first time the technology been used on the development of the 300 MW level turbine generator, the technology features simplified structure and uniform distribution of temperature. In this article, based on the analysis of the heat radiation of the high capacity generator, we calculate the 3D temperature field...
In the paper, we discuss the integration of electrical machines with evaporative cooling technology. Introduce the integration methods and correlation experiment analyses, put forward a new kind of stator insulation structure for evaporative cooling generator with high power density. And the integration of the power devices and other connective equipments makes the total system became unitary. Thus...
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