| 黄粉莲，雷基林，宋国富，申立中，毕玉华，姜开誉.非道路涡轮增压柴油机高原适应性研究[J].内燃机工程,2020,41(4):46-53. |
| Altitude Adaptability of a Turbocharged Off Road Diesel Engine |
| DOI：10.13949/j.cnki.nrjgc.2020.04.006 |
| Key Words:off road diesel engine altitude characteristics regulated two stage turbocharging power recovery |
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| Abstract:To enhance the operating performance of an off road diesel engine in plateau conditions，the engine power, fuel consumption and emission characteristics working at different conditions and altitudes were studied by a bench test. Then the simulations with GT-POWER software were carried out to understand the impacts of altitude on the operation characteristics of turbocharging system. The mechanisms of performance deterioration at high altitude conditions were analyzed in detail. Aiming to the performance recovery of diesel engine at high altitudes, a regulated two stage turbocharging system with exhaust bypass valve was matched with the engine through the parameters calculation. The research results showed that altitude significantly affected the performance of the off road diesel engine. At the engine speeds between 800r/min and 2800r/min, a significant reduction in engine torque and a very important increase in the brake specific fuel consumption (BSFC) were achieved with the rise of altitudes. As the altitude increased from 0 m to 2000m, the engine power dropped as much as more than 4.3%, and the BSFC increased as much as more than 6%. At high altitude conditions, the intake manifold boost pressure and the exhaust manifold pressure both declined sharply while the intake and exhaust manifold temperatures both increased, and the emissions of total hydrocarbon (THC), carbon monoxide (CO) and nitrogen oxide (NOx) increased remarkably. Compared to the single stage turbocharging, the engine power was improved by 14.9% and the brake specific fuel consumption was reduced by 11.8% at 4000m altitude with a regulated two stage turbocharging system. A method of optimized turbocharged diesel engine matching for altitude adaptability was obtained. |
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