中文摘要：

切换的扩大减小(重量的单位) 使用一个开关阀门代替 throttle 阀门为高压力灵魂减少压力。实验显示模拟模型很好预言实际特征。热转移和在扩大坦克和重量的单位的供应坦克的空气的多花采蜜的代表根据实验和模拟模型被学习了。通过在这份报纸的数学推理，多花采蜜的代表能被灵魂容器的空气团，热，和工作交换计算。为在一辆经常的体积坦克的空气，当热吸收足够大在解除过程提起空气温度时，多花采蜜的代表是不到 1；当空气正在经历排出和释放热的过程时，多花采蜜的代表超过特定的热比率(1.4 的值) 。

英文摘要：

Switching expansion reduction （SER） uses a switch valve to substitute the throttle valve to reduce pressure for high pressure pneumatics. The experiments indicate that the simulation model well predicts the actual characteristics. The heat transfers and polytropic exponents of the air in expansion tank and supply tanks of SER have been studied on the basis of the experiments and the simulation model. Through the mathematical reasoning in this paper, the polytropic exponent can be calculated by the air mass, heat, and work exchanges of the pneumatic container. For the air in a constant volume tank, when the heat-absorption is large enough to raise air temperature in discharging process, the polytropic exponent is less than 1; when the air is experiencing a discharging and heat-releasing process, the polytropic exponent exceeds the specific heat ratio （the value of 1.4）.