Research on the overall parameter optimization design method of turboshaft engine based on helicopter mission requirements
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摘要:
针对传统涡轴发动机总体设计过程中直升机/发动机耦合关系考虑不足,且缺少对备选设计参数可行域边界限制的问题,提出了一种基于直升机飞行任务需求寻优设计涡轴发动机总体参数的方法,并根据涡轴发动机发展情况对其设计参数寻优可行域进行了合理限制。该方法由约束分析、任务分析、参数循环计算和寻优迭代4个模块组成,其中寻优迭代模块涉及对设计参数的动态调整,使设计的发动机与任务需求更加匹配。首先推导了上述4个模块的基本原理,基于给定的直升机飞行任务剖面,对提出的设计方法进行了算例验证,针对同一飞行任务,开展了与其他设计方法的结果对比。研究表明:提出的设计参数可行域边界能够为设计参数的选取范围进行合理限制,可作为设计参数选取的一项依据;提出的涡轴发动机总体参数寻优设计方法弥补了其他涡轴发动机总体设计方法中设计参数不参与迭代更新、对直升机/涡轴发动机性能耦合关系考虑欠缺等不足,得到的发动机设计参数与直升机任务需求更加匹配,能够有效减少起飞总重(总耗油量),为直升机/发动机一体化性能设计与优化研究提供基础支撑。
Abstract:In view of the problem of insufficient consideration of helicopter/engine coupling relationship in the traditional overall parameter design process of turboshaft engines and the lack of boundary restrictions on the feasible region of alternative design parameters, a method for optimizing the overall parameters of turboshaft engines was proposed based on the requirements of helicopter flight missions, and the feasible region of design parameter optimization was reasonably limited according to the development of turboshaft engines. The method consisted of four modules: constraint analysis, task analysis, parameter cycle calculation and optimization iteration. The optimization iteration module involved dynamic adjustment of design parameters, which made the designed engine more matched with the task requirements. Firstly, the basic principles of the above four modules were derived. Then, based on the given helicopter flight mission profile, the proposed design method was verified by an example. Finally, the results were compared with other design methods for the same flight mission. The research showed that the proposed feasible region boundary of design parameters can reasonably limit the selection range of design parameters and can be used as a basis for the selection of design parameters. The proposed optimization design method of the overall parameters of the turboshaft engine made up for the shortcomings of other overall design methods of the turboshaft engine, for example, the design parameters were not involved in the iterative update and the lack of consideration of the coupling relationship between the helicopter / turboshaft engine performance.
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$\zeta $ 功率传递系数 Rcruise 巡航航程 u 诱导速度 $ {P_{{\text{install}}}} $ 发动机安装功率 fe 废阻面积 Pwr 单位质量流量功率 Vtip 旋翼翼尖速度 ${P_{{\text{rotor}}}}$ 旋翼需用功率 W 直升机质量 $ {P_{{\text{all}}}} $ 涡轴发动机需要提供的功率 η 轴功率有效转换效率 $ {P_{{\text{fz}}}} $ 废阻功率 $ {P_{{\text{mc}}}} $ 发动机最大连续功率 $ {P_{{\text{yd}}}} $ 诱导功率 $ \varGamma $ 直升机空重比 $ {P_{{\text{xz}}}} $ 型阻功率 πc 压气机压比 $ {P_{{\text{cz}}}} $ 垂直功率 T41 燃气涡轮前温度 C 单位功率耗油率 Wa2 发动机入口流量 表 1 前进比μ与功率传递系数ζ的关系
Table 1. Relation between advance ratio μ and power transfer coefficient ζ
ζ μ=0 μ=0.05 μ=0.10 μ=0.15 μ=0.20 μ=0.25 μ=0.30 μ=0.35 涡轴发动机 0.84 0.85 0.87 0.88 0.88 0.88 0.875 0.87 活塞发动机 0.80 0.81 0.82 0.84 0.86 0.87 0.87 表 2 直升机任务段
Table 2. Helicopter mission
任务段 性能需求 垂直起飞 H=0~100 m 水平加速 H=100 m,Ma=0~0.155 前飞爬升 H=100~1 500 m,Ma=0.155 巡航 H=1 500 m,Ma=0.155,Rcruise =100 km 前飞爬升 H=1 500~3 000 m,Ma=0.155 巡航 H=3 000 m,Ma=0.155,Rcruise =350 km 前飞下降 H=3 000~10 m,Ma=0.155~0 盘旋下降 H=10~0 m,dh/dt=1 m/s 注:确保直升机降落时剩余燃油可供其在海平面悬停半小时。 表 3 任务分析结果
Table 3. Task analysis results
任务段 高度/m 剩余相对总重 Bi
(起始值/结束值)垂直起飞 0~100 1.0000 /0.9999 水平加速 100 0.9999 /0.9994 前飞爬升 100~ 1500 0.9994 /0.9945 巡航 1500 0.9945 /0.9639 前飞爬升 1500 ~3000 0.9639 /0.9592 巡航 3000 0.9592 /0.8645 前飞下降 3000 ~100.8645 /0.8622 盘旋下降 10~0 0.8622 /0.8620 表 4 冷却引气量与涡轮前温度的关系
Table 4. Relationship between cooling gas amount and pre-turbine temperature
T41/K 燃气涡轮
冷却/%动力涡轮
冷却/%总引气
(包括封严、泄漏)/%1350 3 1.5 6 1450 8 2 12 1 900 21 3.5 26 表 5 任务分析结果
Table 5. Task analysis results
任务段 高度/m 剩余相对总重 Bi
(起始值/结束值)垂直起飞 0~100 1.0/ 0.9999 水平加速 100 0.9999 /0.9995 前飞爬升1 100~ 1500 0.9995 /0.9952 巡航1 1500 0.9952 /0.9652 前飞爬升2 1500 ~3000 0.9652 /0.9611 巡航2 3000 0.9611 /0.8712 前飞下降 3000 ~100.8712 /0.8689 盘旋下降 10~0 0.8689 /0.8687 表 6 备选发动机计算结果
Table 6. Calculation results of alternative engines
备选发动机 T41/K πc S/m2 Wa2/(kg/s) Pinstall/kW Pwr/(kW/(kg/s)) C/(kg/(kW·h)) Wto/kg ① 1400 14 223.2455 3.6006 1018.830 282.9620 0.2727 6250.8727 ② 1400 15 219.7112 3.6166 1018.830 281.7127 0.2692 6151.9148 ③ 1400 16 218.0467 3.6381 1018.830 280.0410 0.2662 6105.3069 ④ 1500 14 216.7325 3.0553 1018.830 333.4588 0.2656 6068.5096 ⑤ 1500 15 214.4845 3.0561 1018.830 333.3766 0.2616 6005.5671 ⑥ 1500 16 212.6184 3.0616 1018.830 332.7724 0.2582 5953.3160 ⑦ 1600 14 212.8757 2.6344 1018.830 386.7420 0.2589 5960.5198 ⑧ 1600 15 210.4787 2.6270 1018.830 387.8339 0.2547 5893.4040 ⑨ 1600 16 208.4831 2.6235 1018.830 388.3412 0.2511 5837.5274 表 7 不同方法得到的目标发动机对比结果
Table 7. Comparison results of target engines obtained by different methods
目标发动机设计方法 T41/K πc S/m2 Wa2/(kg/s) Pinstall/kW Pwr/(kW/(kg/s)) C/(kg/(kW·h)) Wto/kg 方法① 1600 16 208.4831 2.6235 1018.830 388.3412 0.2511 5837.5274 方法② 1500 15 212.9425 2.8084 924.9084 329.3364 0.2644 5962.3890 方法③ 1559.980 15.6893 208.5626 2.5052 905.2930 361.3656 0.2576 5839.7521 -
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