涡轮电力分布式推进设计参数优化选择分析

Optimal selection and analysis of design parameters for turbine-electric distributed propulsion

关键词:  涡轮电力  分布式推进  循环参数  差分进化算法  优化  耗油率

Key words:  Turbine-electric  Distributed propulsion  Cycle parameters  Differential evolution algorithm  Optimization  Fuel consumption rate

摘要:

为研究涡轮电力分布式推进系统（Turbo-electric Distributed Propulsion system 简称TeDP）设计参数的选择，基于部件法对整个TeDP系统建立设计点性能计算模型，推导了TeDP的有效功在涡轴尾喷管和风扇系统间的最佳分配关系。在此基础上，以ECO-150-300客机作为应用对象，采用差分进化算法，以设计巡航点的耗油率作为优化目标，对TeDP的循环参数进行优化选择；然后对优化后的循环参数进行分析，并将优化结果与大涵道比涡扇发动机作对比。结果表明，优化后的巡航耗油率比原系统下降了7.68%；存在最佳风扇设计压比使风扇涵道效率最高，最佳设计压比与涵道的总压损失有关；TeDP系统的耗油率对电部件传输效率、自由涡轮效率和风扇绝热效率最为敏感，当效率分别降低1.0%时，耗油率分别上升1.0%，0.94%和0.85%；与涵道比为20的齿轮传动涡扇发动机相比，当电部件传输效率大于0.95时，TeDP才显现经济优势，当电部件传输效率接近1时，TeDP耗油率下降了5.40%。

Abstract:

In order to study the selection of design parameters of the Turbo-electric Distributed Propulsion system （TeDP）， based on the component method， the design point performance calculation model of the entire TeDP system was established， and the optimal distribution relationship of the effective work between the turboshaft nozzle and the fan system was deduced. On the basis of the above， taking the ECO-150-300 aircraft as the application object， using the differential evolution algorithm， and taking the fuel consumption rate at the design cruise point as the optimization goal， the cycle parameters of TeDP were optimized. Then the optimized cycle parameters were analyzed， and the optimized result was compared with the high bypass ratio turbofan engine. The optimized cruising fuel consumption is 7.68% lower than the original system. There is an optimal fan design pressure ratio to make the fan duct with the highest efficiency， and the optimal design pressure ratio is related to the total pressure loss of the duct. The fuel consumption rate of the TeDP system is most sensitive to electrical component efficiency， free turbine efficiency， and fan adiabatic efficiency， and when these efficiencies respectively decrease by 1.0%， the fuel consumption rate increases by 1.0%， 0.94% and 0.85%， respectively. Compared with the geared turbofan engine with a bypass ratio of 20， TeDP shows an economic advantage only when the electrical component efficiency is greater than 0.95. When the electrical component efficiency is close to 1， the fuel consumption rate of TeDP decreases by 5.40%.