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A new asymmetric twin-scroll turbine with two wastegates for energy improvements in diesel engines

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  • Zhu, Dengting
  • Zheng, Xinqian

Abstract

This paper first presented a new asymmetric twin-scroll turbine with two wastegates (ATST-2WG) for energy improvements. An asymmetric twin-scroll turbine with one wastegate (ATST-1WG) is relatively simple and can effectively solve the contradiction between low nitrogen oxide emissions and low fuel consumption when exhaust gas recirculation is employed. However, its disadvantage is that the fuel economy will decrease at a partial opening degree of the exhaust gas recirculation valve, especially at a high-speed engine range. An experimental investigation has been performed to calibrate the numerical model of a diesel engine equipped with an asymmetric twin-scroll turbine with one wastegate, and the engine with an asymmetric twin-scroll turbine with two wastegates model has also been especially established. Based on the models, both the wastegates control strategy and the critical parameter ASY turbine asymmetry (ASY, the ratio of the throat areas of the two scrolls) effect laws have been studied, and they are different from the asymmetric twin-scroll turbine with one wastegate. The brake specific fuel consumption advantage first remains unchanged and then decreases as the engine speed increases, and the maximum fuel economy improvement is 2.91% at the rated power point. The asymmetric twin-scroll turbine with two wastegates has great advantages to achieve a better balance of engine emissions and energy.

Suggested Citation

  • Zhu, Dengting & Zheng, Xinqian, 2018. "A new asymmetric twin-scroll turbine with two wastegates for energy improvements in diesel engines," Applied Energy, Elsevier, vol. 223(C), pages 263-272.
    • Handle: RePEc:eee:appene:v:223:y:2018:i:c:p:263-272
    DOI: 10.1016/j.apenergy.2018.04.078
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    Cited by:

    1. Zhu, Dengting & Zheng, Xinqian, 2019. "Potential for energy and emissions of asymmetric twin-scroll turbocharged diesel engines combining inverse Brayton cycle system," Energy, Elsevier, vol. 179(C), pages 581-592.
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    3. Zhu, Dengting & Zheng, Xinqian, 2019. "Fuel consumption and emission characteristics in asymmetric twin-scroll turbocharged diesel engine with two exhaust gas recirculation circuits," Applied Energy, Elsevier, vol. 238(C), pages 985-995.
    4. Khalil, Khalil M. & Mahmoud, S. & Al- Dadah, R.K., 2020. "Experimental and numerical investigation of blade height effects on micro-scale axial turbines performance using compressed air open cycle," Energy, Elsevier, vol. 211(C).
    5. Ketata, Ahmed & Driss, Zied, 2021. "Characterization of double-entry turbine coupled with gasoline engine under in- and out-phase admission," Energy, Elsevier, vol. 236(C).

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