CAJ | 학술논문

为研究复合增压条件下活塞航空发动机高空性能，建立某型活塞航空发动机复合增压GT－POWER仿真模型并验证模型的准确性，对不同增压条件下的发动机高空特性进行分析。仅在一级涡轮增压条件下，发动机在5000 m高空时，和地面工况相比，压力峰值降低26％且后燃现象严重，同时缸内温度上升，发动机热负荷显著增加，发动机功率下降。在复合增压条件下，高空时缸内压力得到恢复，缸内温度趋于地面工况，发动机功率得到恢复。该发动机搭载某轻型飞机进行高空试飞后，在7600 m高空功率仍可保持80％的功率，验证复合增压技术满足高空飞行的需求。
위연구복합증압조건하활새항공발동궤고공성능，건립모형활새항공발동궤복합증압GT－POWER방진모형병험증모형적준학성，대불동증압조건하적발동궤고공특성진행분석。부재일급와륜증압조건하，발동궤재5000 m고공시，화지면공황상비，압력봉치강저26％차후연현상엄중，동시항내온도상승，발동궤열부하현저증가，발동궤공솔하강。재복합증압조건하，고공시항내압력득도회복，항내온도추우지면공황，발동궤공솔득도회복。해발동궤탑재모경형비궤진행고공시비후，재7600 m고공공솔잉가보지80％적공솔，험증복합증압기술만족고공비행적수구。
In order to investigate the high altitude performance of aircraft piston engines under composite superchar-ging conditions, the GT-POWER model of a composite supercharged system used on a certain aircraft piston engine was established to analyze its altitude characteristics under different supercharging conditions and its accuracy was validated.Based on the simulation results, it was concluded that when the engine was merely under level-one turbo-charging condition, compared with the working condition on the ground, its maximum pressure in cylinder declined by 26 percent and the after-burning phenomenon became severe when it was operated at 5 000 meters above ground. In addition, the temperature in cylinder rose, resulting in apparent increase of thermal load, which ultimately lea-ded to power decrease of the engine.However, if the engine worked under composite supercharging condition, the pressure and power of the engine would recover in the high altitude, and the temperature in the cylinder approached to the level of ground working condition.When the engine was applied to a certain light aircraft, it could still main-tain 80 percent of power even at the height of 7 600 meters, which verified that the composite supercharged system can satisfy the demand of high-altitude flight perfectly.