Full
Outline
Aiming at the performance deterioration of the turbocharging mode switching process of a two-stage sequential turbocharging(TSST) diesel engine, a test of turbocharging mode switching was carried out on a modified TSST diesel engine test platform to investigate the influence of engine load and delayed opening time of intake switching valve(ISV) on the switching process. The test results show that the TSST system can reduce fuel consumption rate in the full range of operating conditions, and the switching boundary of different turbocharging modes is set at 65% load with the goal of economic optimization, which can also be broaden based on the consideration of emissions and switching redundancy. As the load rises, the amplitude of boost pressure fluctuation increases during the switching process, and the degree of sudden change in exhaust pressure increases, resulting in the more serious speed fluctuation of the diesel engine. By delaying the opening of the ISV at the outlet of the high-pressure stage compressor of the cut-in branch, the performance fluctuation can be minimized. Under different loads, there exists an optimal delayed opening time of the ISV, which is the time when the pressure before and after the valve is equal without backflow in the compressor, and the optimal value is shortened with the load increases. Through the optimal valve delay control, the surge and backflow phenomena of compressor are significantly alleviated. The decrease of speed fluctuation can be up to 82.47%, realizing the smooth switching of different turbocharging modes.
2
1
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62662699(Operation and Technical Support)
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
