基于甲醇燃料的航空燃料电池内燃机混合动力系统性能分析

Performance analysis of hybrid power system of aviation fuel cell internal combustion engine with methanol fuel

关键词:  燃料电池  内燃机  混合动力系统  甲醇燃料  性能分析

Key words:  Fuel cells  Internal combustion engines  Hybrid power system  Methanol fuel  Performance analysis

摘要:

为了实现航空碳减排的时代需求，亟需在航空燃料体系和航空动力系统方向实现技术革新。本文提出了基于甲醇燃料的航空燃料电池内燃机混合动力系统方案，甲醇通过机载在线催化重整制氢为燃料电池供氢，燃料电池和内燃机发出的电能带动电动螺旋桨进行工作。进行了模块化建模方法和混合动力系统性能仿真分析研究，结果表明：混合动力系统的发电效率达到了55%，相比甲醇内燃机有了15%绝对值的效率提升，有助于降低燃料消耗。进行了混合动力系统性能参数影响规律分析，结果表明：混合动力系统的效率随着压比的增大而提高，随着燃料利用率的提高而呈现先升高后降低的效果。进行了混合动力系统的?分析，结果显示：混合动力系统中?效率最高的部件是燃料电池，?损最大的部件是重整器。质量分析结果表明：混合动力系统的功率密度达到0.488 kW/kg。

Abstract:

In order to achieve the need of the times to reduce carbon emissions in aviation， there is an urgent need for technological innovation in the direction of aviation fuel systems and aviation power systems. This paper proposes a hybrid power system for an aviation fuel cell internal combustion engine based on methanol fuel， where methanol is used to supply hydrogen to the fuel cell through on-board on-line catalytic reforming， and electric power from fuel cells and internal combustion engines drives the electric propeller. Modular modelling methods and hybrid power system performance simulation analysis were conducted， the results showed the power generation efficiency of the hybrid system reached 55%， which is a 15% absolute efficiency improvement compared to a methanol internal combustion engine and helps to reduce fuel consumption. An analysis of the effect of the hybrid system performance parameters was completed and the results showed that the efficiency of the hybrid system increased with increasing pressure ratio and showed an increase followed by a decrease with increasing fuel utilization. The exergy analysis of the hybrid system was conducted， and the results showed that the component with the highest exergy efficiency is the fuel cell， while the component with the highest exergy loss is the reformer. The mass analysis results showed that the power density of the hybrid system reached 0.488 kW/kg.