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Simulation of the Performance of Two-stage Turbocharged Diesel Engine with Different LP/HP Pressure Ratios
| 题名： | Simulation of the Performance of Two-stage Turbocharged Diesel Engine with Different LP/HP Pressure Ratios |
| 正文语种： | 中文 |
| 作者： | Shi Xin Li Fengming Zhang Hong |
| 作者单位： | of Mechanical Engineering, Beijing Institute of Technology |
| 关键词： | two-stage turbocharging diesel engine pressure ratio split simulation |
| 摘要： | With the requirement of higher BMEP for diesel engines, two-stage turbocharging has been used to enable high boost o- ver a wide engine speed range. While matching with two-stage turbochargers, it is the LP/HP pressure ratio that has important effect on engine performance. In this paper the regulated two-stage turbocharging system with different LP/HP pressure ratios were designed for CA6DL2 diesel engine to improve its low-speed torque characteristic. GT-POWER was used to simulate the engine performance and de- termine the optimal openings of the regulated valve. The simulation results show that with two-stage turbocharging, the engine torque can be improved up to 6%compared to formerly used single-stage turbocharger at low speed range. But under high-speed operating condi- tions, the engine pumping loss will increase greatly since the pressure ratio and efficiency of HP compressor are very low. It indicates that using the method of selecting available commercial turbochargers, a relatively small LP/HP pressure ratio between two stages will bring benefit that it can maintain higher turbocharger efficiency when the regulated valve is open. |
| 会议日期： | 20171024 |
| 会议举办地点： | 上海 |
| 会议名称： | 第19届亚太汽车工程年会暨2017中国汽车工程学会年会 |
| 出版日期： | 1024-01-20 |
| 母体文献： | 第19届亚太汽车工程年会暨2017中国汽车工程学会年会论文集 |
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