不同活塞泄露对直线发电机声电转换特性的影响规律  

Influence of different leakage of piston on performance of linear alternator

作　　者：毕天骄[1,2] 吴张华[1] 罗二仓[1] 

机构地区：[1]中国科学院理化技术研究所低温工程学重点实验室,北京100190 [2]中国科学院大学,北京100049

出　　处：《低温工程》2014年第2期7-13,共7页Cryogenics

基　　金：国家自然科学基金重大项目(50890181);国家科技部基础研究项目(2010CB227303)支持

摘　　要：针对热声发动机驱动的存在活塞泄漏的直线发电机的声电转换特性进行了研究,考察了外接电路的电阻抗以及活塞与外壁的间隙对存在活塞泄漏的直线发电机的功率以及声电转换效率的影响。研究表明,当电路接近谐振状态时,有活塞泄漏的直线发电机的效率最高,并且效率对负载电阻存在最大值。随着活塞与外壁间隙增大,输入声功率会逐渐增高,声电转换效率将会逐渐下降。活塞与外壁之间存在一个泄漏间隙的"安全范围",在该范围之内,活塞泄漏对直线发电机的性能影响并不是很大。The investigation on performance of linear alternator with leaky piston driven by ther- moacoustic engine was implemented to see the influence of electric impedance and leakage of the piston on power and efficiency of transduction for the linear alternator. According to the investigation, the efficiency of transduction for the alternator reaches the highest near electrical resonant state and the efficiency of trans- duction has an optimum value to the load resistance. The input acoustic power increases while the efficiency of transduction decreases when the leakage increases. The leakage has a safety range in which the piston leakage has little influence on the performance of linear alternator.

关 键 词：直线发电机 泄漏 电阻抗 安全范围 

分 类 号：TB652[一般工业技术—制冷工程]