The "863" Electric Vehicle Major Project, led by Professor Li Liansheng from the National Engineering Research Center for Fluid Machinery and Compressors at the School of Dynamics, Xi'an Jiaotong University, was successfully completed. The project was officially accepted by an expert panel organized by the Ministry of Science and Technology in Beijing on December 24th. This initiative focused on advancing key technologies for electric vehicles, with a particular emphasis on fuel cell systems.
Fuel cells are considered the core technology behind fuel cell electric vehicles and have become a major area of global interest. A critical component of this system is the fuel cell-specific air compressor, which plays a vital role in ensuring efficient operation. These compressors must meet strict requirements regarding oil-free lubrication, weight, size, variable speed performance, and dynamic response to changes in stack parameters.
Based on the current state of international research on automotive fuel cell air compressors, and considering China's specific conditions and the requirements of the "863" project, the research team at the university explored two main structural designs: scroll and screw compressors. They conducted detailed thermodynamic and dynamic analyses of the oil-free compressors, developed mathematical models for the compression process, and studied factors affecting volumetric efficiency and overall performance. They also proposed sealing strategies and friction-reduction methods.
Following the development of initial prototypes, extensive testing, improvements, and performance evaluations were carried out over the past two years. The results met the project’s requirements, and the prototype was tested by the Dalian Institute of Chemical Physics, Chinese Academy of Sciences.
Xi'an Jiaotong University has successfully developed a 50 kW scroll air compressor and a 100 kW screw air compressor for fuel cell engines. Both units are independently developed and can operate without any lubricating medium. They meet high cleanliness standards for compressed gas, and the water produced as a reaction product in the fuel cell can be used as a cooling medium, significantly improving compression efficiency.
During the project, three patent applications were submitted, with one granted and two utility model patents approved. A total of eight graduate students contributed to the research. Key participants included Professors Xing Ziwen and Shu Pengcheng, Lecturers Zhao Yuanyang and Wu Huagen, Senior Engineer Bu Gaoxuan, Associate Professors Li Zhiwen and Wang Zhizhong, Lecturer Zhang Wei, Technicians Ming Chenghui and Song Huxin, and graduate students Li Jianfeng, Yang Qichao, Gao Xiguang, Hui Dengfeng, and Yuan Qiang.
Tongji University and Shanghai Aninda Drive Technology Co., Ltd. also participated in simulation tests of stack performance and research on DC permanent magnet motors.
The expert panel concluded that the project fulfilled all contractual requirements and achieved significant progress in key areas of air compressor development. They unanimously approved the project's completion and recommended further efforts to reduce noise, enhance output, and achieve even greater outcomes.
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