Design parameter analysis of gas/turbo-electric driven distributed propulsion system
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摘要:
针对回热式工质驱动分布式推进系统在布局、安装等方面存在的不足,将涡轮电驱动方式与其结合,提出了一种部分涡轮电分布式推进系统。基于部件法建立了设计点计算模型,开展了推进系统的能量流动机理分析,提出了能量传输中关键参数的设计方法。以此为基础,分析了设计参数对推进系统的影响,并对比了分析不同分布式推进系统的性能及设计参数。结果表明:部分涡轮电分布式推进系统耗油率对涡轮前温度的敏感性高于总增压比;相对于工质驱动分布式推进系统,部分涡轮电分布式推进系统存在1.7%的耗油率优势,且当功率占比选取合理时,能够改善原工质驱动分布式推进系统的不足。围绕推进系统耗油率,论证了基于工质驱动的部分涡轮电分布式推进系统在性能上的适用性。
Abstract:Considering the shortcomings in the design and installation of the reheat gas-driven distributed propulsion system, a partial turbine-electric distributed propulsion system was proposed by combining with the turbine-electric driven method. A design point calculation model was established based on the component model. The energy flow mechanism of the propulsion system was analyzed, and the design method of key energy transfer parameters was proposed. Based on the research, the influence of design parameters on the propulsion system was analyzed, and the performance and design parameters of different distributed propulsion systems were compared and analyzed. The results showed that the fuel consumption of the partial turbo-electric distributed propulsion system was more sensitive to the turbine inlet temperature, and the total pressure ratio had less influence. Compared with the gas-driven distributed propulsion system, the partial turbo-electric distributed propulsion system had a fuel consumption advantage of 1.7%, and when the power ratio was reasonably selected, it could improve the gas-driven distributed propulsion system. Focusing on the fuel consumption of the propulsion system, the performance suitability of the partial turbo-electric distributed propulsion system based on the gas-driven propulsion system was demonstrated.
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表 1 变量说明表
Table 1. Symbols
参数 说明 η 效率 π 压比 πΣ 总增压比 W 流量 σ 总压恢复系数 P 功率 T 总温 ε 换热效率 δ 分配比例 表 2 下标说明表
Table 2. Subscribes
下标 说明 cl 低压压气机 ch 高压压气机 bl 引气 b 燃烧室 th 高压涡轮 tl 低压涡轮 h 换热器热端 c 换热器冷端 tp 推进涡轮 fg 工质驱动风扇 fe 电推进风扇 ele 电力系统 trans 传输管路 表 3 部件效率及总压损失
Table 3. Efficiency and total pressure loss of components
部件性能参数 数值 低压压气机等熵效率
(引气压缩效率)0.89 高压压气机等熵效率 0.87 高压涡轮等熵效率 0.90 低压涡轮等熵效率 0.91 换热效率 0.70 换热器总压恢复系数(热端) 0.95 换热器总压恢复系数(冷端) 0.95 工质传输管路总压恢复系数 0.91 推进器风扇等熵效率 0.90 推进涡轮等熵效率 0.92 电力系统传输效率 0.93 表 4 分布式推进系统对比
Table 4. Comparison of distributed propulsion system
参数 工质驱动 部分涡轮电驱动 TeDP δe=0.4 δe=0.6 πcl 11.80 10.47 6.38 δbl 1.70 1.11 1.059 W2D/W23 14.90 13.55 9.20 W23,cor/(kg/s) 15.18 10.83 15.67 W24,cor/(kg/s) 18.70 14.12 21.62 Pele/MW 4.95 7.72 15.22 ζ/(g/(N∙h)) 47.3 46.5 46.3 49.5 -
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