Zhenguo Li

Study on 3D temperature distribution in new evaporative cooling asynchronous generator

Evaporative cooling, is superior to other cooling methods. It offers a safe, reliable, and effective whole surrounding for insulation and heat transfer of the running stator. So its temperature distribution is worthy of being profoundly researched. According to the acceptant technics condition of the manufacture, the paper offers a kind of new stator insulation structure adapting to evaporative cooling mode. It is based on a commutate asynchronism generator of high power density and speed. By calculation and testing, this paper studies the heat distribution of the new insulation system formed by gaseity liquid, and solid. And by comparing between calculation and testing results, a feasible research to the new insulation structure has been given. While the rated load of the new insulation structure stator is decided. The papers valuable research conclusion may be regarded as an academic foundation for the same generators

Developing of turbo generator based on evaporative cooling technique and analysis to key factors

Cooling technique is one of the most important parts to improve the development of turbo generator. From the earliest air cooling technique to the modern water and hydrogen cooling technique, turbo generator is optimized constantly. Evaporative cooling technique is the latest one utilized to cool turbo generator, and we believe that it ought to bring a great progress in improving the efficiency, reliability, security and economics of turbo generator. In this paper, we describe the applications of evaporative cooling technique to cool the electrically active components of generator and analysis to the key factors. The advanced cooling systems are outlined according to the capability of turbo generator, which will provide references for generator designers.

Research on heat transfer of spraying evaporative cooling technique for large electrical machine

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 is built, and perform the heating and cooling experiment. The temperature distribution of experiment model is calculated by FEM taking the theoretical result of convective heat transfer coefficient as the boundary. The results of calculation and experiment are consistent, which shows that the boundary of calculation is suitable, and this method can be used in the calculation and design of spraying evaporative cooling electrical machine.

Experimental research on atomization parameters in spray cooling system

Atomization parameters of liquid droplets in the spray cooling system-droplets velocity, droplets diameter, droplets distribution and others influence significantly on the heat exchange efficiency. This paper uses Phase Doppler Particle Analyser(PDPA) to make a precise measurement on atomization parameters on the spray cooling system used pressure atomizing spray nozzle. Then described the distribution of atomization parameters and summarized its regularity. Through the fitting on large quantities of data obtained in test, its practicable to get the correlation formula between atomization parameters and pressure. Quantitative links between flow and atomization parameters will have an important reference to quantitative design of spray cooling system.

Data monitoring system for evaporative cooling ECR based on LabVIEW

The electron cyclotron resonance ion source magnet is a typical super-high power density magnet, and the evaporative cooling technology is an ideal cooling method for the coils of magnet. In order to ensure the evaporative cooling ECR data monitoring system safe and stable operation, this paper developed a data monitoring system. The system was developed by LabVIEW software based on the OPC technique. This system was designed according to the specific character of evaporative cooling ECR. It has the function such as real-time data acquiring, data display, data analysis, data processing and data storage.