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| Research on the Influence Rule of Air Exchange Parameters of Split Cycle Expansion Engine （SCEE） |
| DOI：10.13949/j.cnki.nrjgc.2024.03.009 |
| Key Words:split cycle high-efficiency engine air exchange system efficiency improvement |
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| Abstract:Taking a split cycle expansion engine（SCEE） as the research object， the influence rule of expansion cylinder air exchange parameters was studied， which provided a guidance for the design and optimization of high-efficiency engines. The results indicated that the reduction of intake valve lift increased the inlet pressure of the expansion cylinder and pumping loss of the combustion cylinder. When the intake valve lift was reduced from 6 mm to 1 mm， the indicated thermal efficiency was reduced by 5.83% at most. The reduction of the expansion cylinder exhaust valve lift increased the pressure of the high-pressure tank， and the power consumption in the compression process of the expansion cylinder increased. The effect of the power consumption of the expansion cylinder was dominant. When the exhaust valve lift was reduced from 8 mm to 3 mm， the indicated thermal efficiency decreased by 2.80% at most. The advance of the exhaust valve closing timing of the expansion cylinder increased the inlet pressure of the expansion cylinder and the pressure loss at the inlet of the expansion cylinder. A better trade-off was obtained when the exhaust valve closing timing was 10°， and the indicated thermal efficiency was 47.78%. The delay of the expansion cylinder exhaust valve opening timing reduced the backflow caused by excessive expansion. |
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