| Mechanical and Energy Engineering |
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| Simulation test on single valve expander for waste heat recovery of gasoline engine |
| LIU Zi qi，GAO Wen zhi，LI Guang hua，HE Wang bo |
1. State Key Laboratory of Engines，Tianjin University，Tianjin 300072，China
2. School of Mechanical and Power Engineering, Dalian Ocean University, Dalian 116023, China |
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Abstract According to the working characteristics of expander with water as working fluid, the theoretical model of a single valve expander was established based on Matlab/Simulink software in order to recover the exhaust energy, which accounts for about 35% of the total fuel energy. The model’s performance was analyzed, and its validity was verified by test. The simulation results show that the increase of inlet pressure and intake valve lift can lead to an increase of power and mass flow rate of expander, while a decrease of expander efficiency. The output power and mass flow rate increase at first and then tend to be steady with the rise of the rotation speed. The increase of the work fluid temperature can lead to a lower mass flow rate, but has inconspicuous influence on output power and expander efficiency. The test results of the expander show that the expander output power can reach 3 kW and the efficiency of the combined cycle system is increased by 5% when the output power of gasoline engine is 61 kW.
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Published: 08 December 2016
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汽油机余热回收单阀膨胀机模拟试验
发动机尾气能量占燃料燃烧放热总量的35%左右,为回收这部分能量,针对以水为工质的单阀膨胀机的工作特点,建立基于Matlab/Simulink的单阀膨胀机模型.分析该模型的性能,并进行试验验证模型的正确性.模拟结果表明,进气压力和进气阀升程的增加会导致单阀膨胀机输出功率和质量流量的增大,同时导致膨胀机效率的降低.随着转速的增大,膨胀机输出功率和质量流量先增大后趋于平稳|进气温度升高会导致质量流量的下降,对膨胀机输出功率和效率的影响不大.膨胀机试验结果表明,当汽油机功率为61 kW时,膨胀机回收的功率可达3 kW,使联合循环系统总输出功率增加5%.
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