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Characteristic and regulation method of parallel turbocompound engine with steam injection for waste heat recovery

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  • Zhao, Rongchao
  • Wen, Dayang
  • Li, Weihua
  • Zhuge, Weilin
  • Zhang, Yangjun
  • Yin, Yong

Abstract

In a parallel turbocompound engine, a power turbine (PT) is fitted in the exhaust pipe in parallel with the turbocharging turbine (CT) for waste heat recovery. In this study, steam is generated using the exhaust heat and injected at the turbines inlet to improve the turbine power and engine performance. Numerical model for the engine cycle is established using commercial software GT-POWER. The model is validated against the experimental results of the turbocompound engine and precisely predicts the engine performance. Based on the model, the impacts of the CT and PT sizes on the performance of the parallel turbocompound engine are evaluated firstly. It is found that variable geometry turbine (VGT) should be applied on PT to regulate the energy distribution between the two turbines at engine off-design condition. Then the influences of steam mass flow rate on the engine BSFC, power and efficiency are investigated. The optimum values of the steam mass flow rate and PT size is closely related to the exhaust temperature. At last, the characteristic and regulation pattern of the steam injected parallel turbocompound engines are compared with series turbocompound engine. In parallel turbcompound engine, the BSFC is decreased by 2.08%–3.28% with steam injection.

Suggested Citation

  • Zhao, Rongchao & Wen, Dayang & Li, Weihua & Zhuge, Weilin & Zhang, Yangjun & Yin, Yong, 2020. "Characteristic and regulation method of parallel turbocompound engine with steam injection for waste heat recovery," Energy, Elsevier, vol. 208(C).
    • Handle: RePEc:eee:energy:v:208:y:2020:i:c:s0360544220315292
    DOI: 10.1016/j.energy.2020.118422
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    References listed on IDEAS

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    1. Zhang, Zhongbo & Liu, Qin & Zhao, Rongchao & Chen, Youpeng & Qin, Qichao, 2022. "Research on in-cylinder steam injection in a turbocompound diesel engine for fuel savings," Energy, Elsevier, vol. 238(PA).

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