基于等温活塞换热的空气压缩方法

考虑到使用绝热压缩进行压缩空气储能系统过程中，大量的电力转为热量被耗散，提出了一种利用等温活塞吸收压缩空气中的热量，并把热量排出到缸体底部的液体中的方法，建立了等温活塞传热的无因次化数学模型.提出了影响等温活塞换热的量纲一系数K_a和X_u，分析了量纲一系数对等温活塞压缩系统的影响.采用泡沫铝作为构成等温活塞的材料进行了实例计算，结果表明压缩比为7、转速为1 200 r/min时，压缩效率可提高11%. 

Air Compression Method Based on Isothermal Piston Heat Exchange

Compressed air energy storage also has shortcomings of low energy storage efficiency and long payback period. At present,most compressed air energy storage systems use adiabatic compression. When the compressed air is compressed,a large amount of power is consumed into heat. In this paper,a method was proposed,using the isothermal piston to absorb the heat in the compressed air and discharge the heat to the liquid at the bottom of the cylinder. Firstly,a dimensionless mathematical model of isothermal piston cooling was established. Then the dimensionless coefficients K_a and X_u affecting the heat transfer of isothermal piston were proposed and its influence on the isothermal piston compression system was analyzed. Finally,an example calculation was made with aluminum foam to form an isothermal piston,compression ratio of 7,speed 1 200 r/min,compression efficiency can be increased 11%.