液态空气驱动的半开半闭循环发动机

由于液态空气的低温和压缩特性，其储存的能量包含冷能、膨胀能。能量的组成和数量与气化压力的大小有关。过去的全开环气动发动机仅仅利用了膨胀能，而忽略了冷能，这导致发动机效率低。液态空气驱动的半开半闭循环发动机，充分利用膨胀能和冷能来提高效率。开环和闭环的权重比是影响发动机效率的一个重要因素。

Liquid air fueled Half closed and Half open Cycle Engine#br#

  The energy stored in the liquid air is found to be composed of the cryogenic energy and the expansion energy, due to its low temperature and compressibility (when gasified). The composition and the quantity of energy are related to the gasification pressure. Pure open cycle engines have devoted much attention only to making use of the expansion energy, while the cryogenic energy is usually disregarded, which results in a poor efficiency of the engines. A half closed and half open cycle engine is proposed to improve the efficiency by making use of both the cryogenic energy and the expansion energy. The volume ratio is employed as an index that indicates the weight ratio of open cycle to closed cycle, which is a significant factor that influences the efficiency of the engine.