Simulation of Performance Optimization for Low-Speed Engine with Variable Scavenge Ports

曹尔明; 朱骏; 李磊; 刘博; 桂勇; 钱跃华

doi:10.13949/j.cnki.nrjgc.2021.01.011

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Simulation of Performance Optimization for Low-Speed Engine with Variable Scavenge Ports

更新时间：2026-04-16

- Simulation of Performance Optimization for Low-Speed Engine with Variable Scavenge Ports
- Vol. 42, Issue 1, Pages: 68-75(2021)
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- DOI：10.13949/j.cnki.nrjgc.2021.01.011
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- Published：2021
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曹尔明，朱骏，李磊，刘博，桂勇，钱跃华.可变扫气口对低速机性能优化作用的仿真研究[J].内燃机工程,2021,42(1):68-75.

曹尔明, 朱骏, 李磊, et al. Simulation of Performance Optimization for Low-Speed Engine with Variable Scavenge Ports[J]. 2021, 42(1): 68-75.
曹尔明，朱骏，李磊，刘博，桂勇，钱跃华.可变扫气口对低速机性能优化作用的仿真研究[J].内燃机工程,2021,42(1):68-75. DOI： 10.13949/j.cnki.nrjgc.2021.01.011.

曹尔明, 朱骏, 李磊, et al. Simulation of Performance Optimization for Low-Speed Engine with Variable Scavenge Ports[J]. 2021, 42(1): 68-75. DOI： 10.13949/j.cnki.nrjgc.2021.01.011.

摘要

为了进一步提高低速机热效率，基于一台500mm缸径的低速机的热力学仿真模型，研究了可变扫气口技术提升低速机热效率的潜力。计算了对称可变扫气口结构和非对称可变扫气口结构在不同发动机负荷、不同扫气口高度下的有效燃油消耗率、排气流量、排气温度等参数。在保证同样的NOx排放水平下，可变扫气口技术能有效提升低速机热效率，油耗最多可降低约4.3g/(kW·h)。此外对带有选择性催化还原（selective catalytic reduction

SCR）系统的主机，可变扫气口使SCR主机排气流量减小，排气温度升高，有利于SCR系统的紧凑性设计和降低SCR系统的成本。

Abstract

In order to further improve the thermal efficiency of low-speed engines

the improvement of the potential thermal efficiency of low-speed engines equipped with variable scavenge ports was studied based on the thermodynamic simulation model of a low-speed engine with cylinder bore of 500 mm in diameter. Parameters sucha as brake specific fuel consumption (BSFC)

exhaust flow rates and exhaust temperatures of low-speed engine with variable symmetric and asymmetric scavenge ports at different engine loads and with different scavenge port heights were calculated. At the same NOx emission level

the variable scavenge ports technology can effectively improve the thermal efficiency of the low-speed engine

reducing the fuel consumption by up to about 4.3g/(kW·h). In addition

for an engine with selective catalytic reduction (SCR) system

the variable scavenge ports technology can reduce exhaust flow and increase exhaust temperature

which is beneficial to the compact design of a SCR system and reduces the cost of a SCR system.

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