A set of two-cylinder engine concepts utilizing a supercharger and piston- or turbine-compounding were compared to a turbocharged engine modeled with a consistent methodology developed in previous works. In-cylinder insulation was added to each of the engines to evaluate the effects on performance. The goals of this simulation were to utilize energy that otherwise would be bypassed around the turbine side of a turbocharger and redirect it to the crankshaft, as well as to redirect energy that would previously have entered the coolant into the exhaust gases where it could be reclaimed by a second expansion process. Gains in performance and efficiency were thoroughly analyzed to provide insight into the magnitudes and mechanisms responsible. It was found that the second expansion process from exhaust-compounding was able to significantly improve engine performance at moderate to high loads, as well as compensate for the loss in volumetric efficiency that accompanies in-cylinder insulation. The piston-compounded single-shaft DCDE was able to outperform the turbocharged multi-shaft DCDE at mid to high loads, and in maximum brake power due to the low losses in the coupled nature of the second expansion, while the turbine-compounded engine suffers higher losses due to the turbomachinery mismatch with the positive displacement power cylinders.

将一组使用增压器和活塞或涡轮复合的两缸发动机概念与采用以前工作中开发的一致方法建模的涡轮增压发动机进行了比较。缸内绝缘层已添加到每个发动机中，以评估对性能的影响。该模拟的目标是利用原本会绕过涡轮增压器的涡轮机侧绕过的能量，并将其重定向到曲轴，以及将以前已经进入冷却剂的能量重定向到可以回收的废气中。通过第二次扩展过程。对性能和效率方面的收益进行了全面分析，以洞悉责任的大小和机制。人们发现，从排气复合的第二膨胀过程能够显着改善中负荷到高负荷下的发动机性能，并补偿缸内绝缘带来的容积效率的损失。活塞复合式单轴DCDE在中高负荷下性能优于涡轮增压多轴DCDE，并且由于第二次膨胀的耦合损耗小而在最大制动力方面表现出色，而涡轮复合式发动机则遭受由于涡轮机械与正排量动力缸不匹配而导致更高的损失。