Parametric study of power turbine for diesel engine waste heat recovery
Parametric study of power turbine for diesel engine waste heat recovery
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DOI：
10.1016/j.applthermaleng.2014.03.032
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发表时间：
2014-06
影响因子：
6.4
通讯作者：
Rongchao Zhao;W. Zhuge;Yangjun Zhang;Yong Yin;Zhen Chen;Zhigang Li
中科院分区：
文献类型：
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作者：
Rongchao Zhao;W. Zhuge;Yangjun Zhang;Yong Yin;Zhen Chen;Zhigang Li
涡轮复合技术是一种很有前途的内燃机排气余热回收技术。动力涡轮机的设计对涡轮复合式发动机的性能起着关键作用，本文利用作者建立的涡轮机通流模型，对涡轮复合式柴油机动力涡轮机进行了一系列参数研究。利用发动机性能试验数据对该仿真模型进行了验证，取得了较好的精度.首先分析了三个关键几何参数（叶片高度、叶片半径和喷嘴出口叶片角）对涡轮机膨胀比和发动机燃油消耗的影响。在此基础上，分析了几何参数对功率分布、空气质量流量和排气温度的影响。结果表明，这些参数对发动机油耗和功率有显著影响。在发动机高转速下，几何参数存在一个最佳值，以获得最低的BSFC。在发动机低转速下，发动机BSFC随着几何参数的变化而不断增加或减少。研究还发现，发动机BSFC对喷管出口叶片角最为敏感，在设计过程中应仔细考虑。本文为涡轮复合发动机动力涡轮机的匹配设计提供了一种有用的方法。
Turbocompounding is a promising technology to recover waste heat from the exhaust and reduce fuel consumption for internal combustion engine. The design of a power turbine plays a key role in turbocompound engine performance.This paper presents a set of parametric studies of power turbine performed on a turbocompound diesel engine by means of turbine through-flow model developed by the authors. This simulation model was verified and validated using engine performance test data and achieved reasonable accuracy. The paper first analyzed the influence of three key geometrical parameters (blade height, blade radius and nozzle exit blade angle) on turbine expansion ratio and engine fuel consumptions. After that, the impacts of the geometrical parameters on power distribution, air mass flow rate and exhaust temperature were analyzed. Results showed that these parameters had significant effects on engine BSFC and power. At high engine speeds, there existed an optimum value of geometry parameter to obtain the lowest BSFC. At low engine speeds, the engine BSFC kept increasing or decreasing continuously as the geometry parameters changed. Research also found that the engine BSFC was most sensitive to the nozzle exit blade angle, which should be considered carefully during the design process. This paper provides a useful method for matching and designing of a power turbine for turbocompound engine.