基于可变高增压方式的航空活塞发动机变海拔工作特性仿真研究OA北大核心CSTPCD

Using an inline four stroke compression ignition aviation piston engine as the research model,an one-dimensional thermodynamic model was constructed by using GT Power.Firstly,the effects of fixed cross-section turbocharging(FGT),variable geometry turbocharging(VGT),and two-stage variable geometry turbocharging(TVGT)on engine performance were compared and studied at different altitudes.Then,based on the constructed TVGT turbocharging system,the influence of high and low pressure VGT blade opening on the operating characteristics of the engine under variable altitude conditions was explored.The results show that under different altitude and speed conditions,the engine with a TVGT turbocharging system has better altitude adaptability.For the TVGT system,high power and economy can be achieved at different altitudes when the opening of the high-pressure stage VGT blades is in the range of[0.2,0.4],and the opening of the low-pressure stage VGT blades is in the range of[0.6,0.8].By optimizing the opening of high and low pressure VGT blades,a power recovery target of 106.8%can be achieved at an altitude of 6 000 m under cruising conditions at a speed of 3 397 r/min,which can meet the power recovery requirements of the engine for maximum working altitude.