Analysis of recoverable exhaust energy from a light-duty gasoline engine
Analysis of recoverable exhaust energy from a light-duty gasoline engine
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DOI：
10.1016/j.applthermaleng.2012.03.025
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发表时间：
2013-05
影响因子：
6.4
通讯作者：
Tianyou Wang;Yajun Zhang;Jie Zhang;G. Shu;Zhijun Peng
中科院分区：
文献类型：
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作者：
Tianyou Wang;Yajun Zhang;Jie Zhang;G. Shu;Zhijun Peng
为了提高内燃机的总效率和减少二氧化碳的排放，EER （Exhaust Energy Recovery，废气能量回收）已经得到了广泛的研究，本文以蒸汽朗肯循环EER系统为基础，通过实验和数值模拟对其效率的提高进行了研究。试验是在一台连接多盘管螺旋换热器的轻型汽油机上进行的。结合实验和模拟结果，表明工质流量对蒸汽出口压力和过热程度的控制具有重要而复杂的作用。为了达到所需的过热和蒸汽压力，如果发动机工作状态发生变化，必须仔细调节流量。流量对换热器效率也有显著影响。为了获得更好的换热效率，应尽可能保持高的流量。仿真结果表明，基于轻型试验发动机的EER系统可将发动机燃油转换效率提高14%，而在一般车辆工况下，该系统的燃油转换效率仅为3% ~ 8%。通过试验发现，安装热交换器可使排气背压略有提高，在一定工况下，发动机总节油率可达34%。
While EER (Exhaust Energy Recovery) has been widely pursued for improving the total efficiency and reducing CO2emissions of internal combustion engines, the improvement on engine efficiency has been investigated with experimental work and numerical simulation based on a steam Rankine cycle EER system. The test was conducted on a light-duty gasoline engine connected with a multi-coil helical heat exchanger. Combining those experimental and modelling results, it demonstrates that the flow rate of working fluid plays a very important and complex role for controlling the steam outlet pressure and overheat degree. For achieving required overheat and steam pressure, the flow rate must be carefully regulated if the engine working condition changes. The flow rate has also significant influence on the heat exchanger efficiency. To achieving better heat transfer efficiency, the flow rate should be maintained as high as possible. From the simulation, it is found the EER system based on the light-duty test engine could increase the engine fuel conversion efficiency up to 14%, though under general vehicle operating conditions it was just between 3% and 8%. From the test, it is found the installation of heat exchanger can increase the exhaust back pressure slightly, the total fuel saving of the engine could be up to 34% under some operating condition.