针对未来航空航天任务对大功率空间电源的迫切需求，开展了国内首次高温惰性气体法拉第型磁流体发电机试验研究。试验采用电弧加热器作为模拟热源，以氩气作为工质，添加铯作为电离种子以提高工质电导率，成功实现了对法拉第型磁流体发电机的原理性验证，在1 T磁场环境的试验条件下取得了最高194 W的发电功率，功率密度为866 kW/m3。根据试验条件对发电过程进行了三维数值模拟，分析结果表明：发电机输出性能受电极压降和工质速度的影响较大，需要在后续研究中改进发电机工艺以降低电极压降，并对加速喷管重新进行设计。
The high power space power system is in urgent demand for the next generation aerospace missions. This paper presents the ground-based experiment of the high temperature inert gas Faraday type MHD generator first conducted in China, with arc heater as the heating source, argon the working gas, and cesium injected to improve the conductivity of the working gas. The faraday type MHD generation is successfully carried out, with the maximum output power reaching 194 W under 1 T magnetic field strength and the power density being 866 kW/m3. Three-dimensional numerical simulation is conducted under the experiment conditions, showing that the MHD generator output character is largely affected by the seed injection effect and working gas velocity. To avoid these problems, the generator processing technology needs to be improved to reduce the voltage drop, and the nozzle needs redesign.
[1] 居滋象,吕友昌,荆伯弘.开环磁流体发电[M]. 北京:北京工业大学出版社, 1998:24-27. JU Z X, LV Y C, JIN B H. Open cycle MHD power generation[M]. Beijing:Beijing Technical University Publishing House, 1998:24-27(in Chinese).
[2] 李益文, 张百灵, 李应红,等. 磁流体动力学在航空工程中的应用与展望[J]. 力学进展, 2017,47(1):456-506. LI Y W, ZHANG B L, LI Y H, et al. Applications and prospects of magnetohydrodynamics in aeronautical engineering[J]. Advances in Mechanics, 2017,47(1):456-506(in Chinese).
[3] LITCHFORD R J, HARADA N. Multi-MW closed cycle mhd nuclear space power via nonequilibrium He/Xe working plasma[C]//Proceedings of Nuclear and Emerging Technologies for Space,2011.
[4] MURAKAMI T, OKUNO Y, YAMASAKI H. Achievement of the highest performance of a CCMHD generator:An isentropic efficiency of 63% and an enthalpy extraction ratio of 31%[J]. IEEE Transactions on Plasma Science, 2004, 32(5):1886-1892.
[5] HARADA N. Recent progress in the study of closed cycle MHD system[C]//27th AIAA Plasmadynamics and Lasers Conference. Reston:AIAA, 1996.
[6] ISHIKAWA M, INUI F, UMOTO J. Fault analysis of a diagonal type MHD generator controlled with local control circuit[J]. Energy Conversion and Management, 1999, 40(3):249-260.
[7] ROSA R J. Magnetohydrodynamic energy conversion[M]. New York:McGraw-Hill, 1968.
[8] YAMASAKI H, MURAKAMI T, OKUNO Y. Characteristics of supersonic closed loop with disk CCMHD generator[J]. Electrical Engineering in Japan, 2011,175(12):1543-1552.
[9] 李益文, 李应红,张百灵,等, 热电离磁流体风洞研制及磁流体功率提取初步实验[C]//第八届全国实验流体力学学术会议, 2010. LI Y W, LI Y H, ZHANG B L, et al. Development of thermal ionization MHD tunnel and preliminary MHD power generation experiment[C]//The Eighth National Conference on Experimental Fluid Mechanics, 2010(in Chinese).
[10] HARADA N. Closed cycle MHD power generation system without alkali-metal seed[C]//Energy Conversion Engineering Conference, 1996.
[11] LIBERATI A, MURAKAMI T, OKUNO Y, et al. Numerical simulation of less divergent disk MHD generator with high magnetic flux density[C]//37th AIAA Plasmadynamics and Lasers Conference.Reston:AIAA, 2006.
[12] MIZUKOSHI R, MATSUMOTO Y, FUJINO T, et al. Design and performance analysis of large scale nonequiliburium disk MHD generator[C]//38th AIAA Plasmadynamics and Lasers Conference.Reston:AIAA, 2007.
[13] KOMINAMI S, FUJINO T, ISHIKAWA M. Performance characteristics of commercial scale disk MHD generator with plasma production technique[C]//40th AIAA Plasmadynamics and Lasers Conference.Reston:AIAA, 2009.
[14] MURAKAMI T, OKUNO Y. Simulation and demonstration of magnetohydrodynamic energy conversion in a high temperature inert gas[J]. Physics of Plasmas, 2009, 16(3):033501.
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