文章结合大型空间环境模拟试验的特点对林德循环和克劳特循环两种液化方法进行改进，提出节流膨胀和涡轮膨胀两种回收方案。
This paper gives two recycling techniques & expansion by throttle and expansion by turbine , based on the common liquefying methods in industry .
林德循环