Linear engine has been presented as a potential substitute for conventional crank engine (CCE). This paper proposes a multi-dimensional thermodynamic model which couples piston motion, scavenging and combustion to reveal the thermodynamic performance of a single-cylinder linear engine (SCLE) by comparing a CCE. The results indicate that the SCLE provides longer gas exchange duration for exhaust cleaning, and it has a shorter residence time near top dead center for combustion. As a result, the SCLE shows higher scavenging efficiency and more complete exhaust, although the longer gas exchange duration of the SCLE also has a negative impact on the trapping efficiency. Moreover, it also finds that the SCLE operates with a lower combustion efficiency and longer combustion duration than the CCE due to its faster motion around top dead center. Therefore, the thermal efficiency of SCLE is lower.

线性发动机已被提出作为常规曲柄发动机（CCE）的潜在替代品。本文提出了一个多维热力学模型，该模型将活塞运动，扫气和燃烧耦合在一起，以通过比较CCE揭示单缸线性发动机（SCLE）的热力学性能。结果表明，SCLE为排气净化提供了更长的气体交换持续时间，并且在燃烧的上止点附近具有较短的停留时间。结果，尽管SCLE的更长的气体交换持续时间也对捕集效率具有负面影响，但是SCLE显示出更高的清除效率和更完全的排气。此外，还发现，由于SCLE绕上止点运动更快，因此其燃烧效率和燃烧持续时间均比CCE低。因此，