Development Design And Study Of Turbo-Machine With Large-Discharge And High-Pressure Based On CFD

As one of energy equipments which transform the energy between the fluid and the shaft power with continuous rotating blades, turbo-machine is widely used in energy, electrical power, petrochemical industry, transportation and other fields of the national economy and military defense. For the needs of national heavy equipment manufacturing industry and modern economic, it's an inevitable trend of developing the turbo-machine with high requirement and high reliability. For example, cooling fan used on electrical multiple unit train(MU) has the features of small space taking, low power consumption, large discharge and higher pressure for the motor cooling; another example is Reactor Coolant Pump(RCP), which is called "heart" of the nuclear power stations, is required to have a long-term, safe, reliable operation in the environment with high temperature, high pressure and radiation, and a high lift and large discharge performance characteristics are included. But the internal flow of the turbo-machine with large discharge and high pressure is very complicated and it's still too difficult to design RCP for its high requirement such as high aerodynamic performance and high reliability. The domestic needs relying on imports in a long time, has severely limits our national industrial development and external economic development process. Developing the advanced, efficient and reliable turbo-machinery, which can make up for domestic technology gaps and replace imported products, strengthen competitiveness of the turbo-machinery with high requirement in international markets, has an important significance on our national economic development.In the paper, the localization design of the cooling fan used on "CRH" MU project was conducted. According to the project needs, The performance analysis of imported fan and its modified schemes, which used the method of one-dimensional calculation to confirm the geometry parameters of the machine, and three-dimensional numerical simulation to analyze the inner flow and predict the performance, were all carried on. In order to raise the efficiency of the fan, assure the pressure raise and lowest power, and make the fan's operation reliable, the further analysis and multi-scheme retrofit design of the important fluid pass components, such as impeller, inlet flow passage and diffuser part, were conducted in the same way as above. And then the performance experiment on the proto-type was accomplished. The result datum showed that the original designed cooling fan can meet the requirements of the new "CRH" MU well, and the fan was good through the performance test carried out in the center of fan quality supervision and checkout. This type of fan has been produced in batches, and used on MU, so the localization design of this type of fan used on MU was accomplished. At the same time, the experience in the localization design of cooling fan with large discharge and high pressure was summarized for the study of the impeller blade leading edge profile optimization of API 000 reactor coolant pump. Based on Design3D software for optimal design, with the objective function of maximizing the total adiabatic efficiency, the study for the law of leading edge profiles along the different blade heights of impeller in the standard conditions was carried out. And the design basis for improving the aerodynamic performance around the leading edge of Reactor Coolant Pump was provided.