摘要
太阳能盘式聚光器和斯特林发动机能够很好地结合成为一种新型的具有广阔应用前景的动力系统,其性能研究和开发利用受到世界许多国家的重视。该文以等温模型为基础,考虑各部件中的工质流动损失、导热损失及活塞的穿梭和泵气热损失等,对一个低压无转速调节装置的盘式聚光器—斯特林发动机在一典型晴天日照下的一天中热性能进行模拟。结果显示;早晨接收器的温度随太阳辐射的增加迅速上升,输出功率和系统效率也快速增加,而后接收器的温度基本处于恒定,因而膨胀腔的膨胀功不变,接受器接收太阳辐射的增加使斯特林发动机的转速上升。流动阻力及各种热损失占膨胀功的比例随转速的升高越来越大,在上午10～12点时,输出功率又略有下降,而下午又正相反。因此,一天中的系统效率曲线呈一马鞍形。此外,结果也显示,提高发动机的工质压力,系统效率也将升高。
Dish/Stirling systems with solar thermal technology can play an important role in facing the demands for clean electric power generation. A transient simulation method to simulate the performances for a dish/Stirling engine system were presented by low pressure and no controller of output, under the normal sunshine day based on the simple isothermal calculation method and considered pressure losses and heat losses of every parts of Stirling engine, including the heat losses of pistons cycle and seal gas cycle. The simulation results show that the temperature of cavity receiver increases quickly in the early morning, so the system output and efficiency increase promptly. When the temperature of cavity receiver reaches the application temperature, it keeps approximately the value so that the expansion energy is not changed, and the rotating speed increases with the increase of solar irradiation. Because pressure losses and heat losses of every part increase substantially when the rotating speed increases, as the result, the system output decreases a little between 10-12 am. The case of afternoon is just opposite to that of morning, so the system efficiency is a saddle in a day. Moreover, the system efficiency increases with the increase of pressure in the system.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2004年第5期657-662,共6页
Acta Energiae Solaris Sinica
基金
南京航空航天大学人才引进启动基金资助(S0391 023)
关键词
盘式聚光器
斯特林发动机
等温模型
Heat losses
Isotherms
Performance
Power generation
Rotation
Solar energy
Solar radiation
Speed control
