带补燃增压的航空活塞发动机复合型起动策略研究

Investigation on Hybrid Start-up Strategy of Aero-piston Engine with Hyperbar

航空活塞发动机有着功重比高,体积小,油耗低的优势,旁通补燃增压系统可以提升发动机功率,但由于其系统特殊性,需要进行起动策略设计与研究。针对带补燃增压的航空重油发动机,设计了电机起动与高压空气起动相结合的复合型起动策略。以某型200kW补燃增压重油发动机作为验证,根据发动机基本参数,进行起动能量理论分析,设计了发动机起动策略:首先起动燃机循环,再由涡轮前引高温高压燃气用于空气起动系统,起动电机同时驱动曲轴,在二者的共同作用下将发动机加速至最低起动转速,完成起动过程。并使用GT-POWER软件进行瞬态一维仿真分析,从理论与数值仿真方面验证起动策略可行性。

Aero-piston engines have the advantages of high power-to-weight ratio, small volume and low fuel consumption. The hyperbar system can improve the engine power and it is necessary to design and investigate the start-up strategy due to the particularity of the system. Aiming at the aero-piston engine with hyperbar system, a hybrid start-up strategy, the combination of motor starting system and air starting system, is designed in this paper. Taking a 200 kW diesel engine with hyperbar system as verification, according to the basic parameters of the engine, the theoretical analysis of starting energy is carried out. The strategy of engine start-up system is designed: start the gas turbine cycle first, and then use high-temperature and high-pressure gas in front of the turbine for the air starting system. The starting motor drives the crankshaft at the same time. Under the combined action of the two, the engine is accelerated to the minimum starting speed, and the starting process is completed. The transient one-dimensional simulation analysis of the starting process is established by using GT-POWER software. The feasibility of start-up strategy is verified by theoretical and numerical simulation.