A Design Method of Radial Turbine for Ultra-micro Gas Turbine
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摘要: 本文首先通过匹配计算确定了微型燃气轮机增程器的主要性能指标,并通过模型分析得到微型向心涡轮的设计参数;其次根据向心涡轮工作过程建立损失模型,将遗传算法融入设计方案,编制了设计流程和计算程序;最后依据设计结果完成了微型向心涡轮结构设计,并利用CFD方法进行数值模拟计算。仿真计算结果表明:所设计的微型向心涡轮的轮周效率、轴效率以及输出功率均达到了设计要求,同时内部流场模拟结果显示涡轮也具有较好的气动性能,说明所采用的设计方法是可靠的。Abstract: Firstly, the main performance indexes of the micro gas turbine range-extender are determined by matching calculations, and the design parameters of the micro radial turbine are obtained through model analysis in this paper. Secondly, according to the working principles of the radial turbine, its loss model is established, and its genetic algorithm is integrated into the design scheme. On this basis, its design processes and calculation programs are compiled.Finally, according to the design results, the structural design of the micro radial turbine is completed, and the CFD method is used for numerical simulation.The simulation results show that the peripheral efficiency, entropic efficiency and output power of the micro radial turbine thus designed meet the design requirements. Meanwhile, the internal flow fieldsimulation results show that the micro radial turbine has good aerodynamic performances, indicating that the design method adopted in the paper is reliable.
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Key words:
- Extended-range electric vehicle /
- micro gas turbine /
- radial turbine /
- design method
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表 1 电动汽车增程器对比
增程器 功率密度
/(kW·kg−1)燃料适应性 噪声/dB 成本 MGT 0.48 ~ 0.80 广泛 <65 低 ICE 0.16 ~ 0.45 单一 >90 低 PEFC 0.50 ~ 0.90 单一 <45 高 表 2 北汽EV150电动汽车主要技术参数
参数名称 数值 整车总质量/kg 1300 最高车速/ (km·h−1) 120 最大爬坡度/% 20 0 ~ 50 km加速时间/s 5.3 表 3 微型燃机热力循环分析主要设计条件
参数名称 取值 空气质量流量/(kg·s−1) 0.1 压气机压比 3 涡轮膨胀比 2.8 压气机效率 0.85 燃烧室效率 0.8 回热器效率 0.7 涡轮效率 0.82 表 4 微型燃气轮机各部件主要性能参数
参数名称 取值 整机输出功率/kW 20 转速/(r·min−1) 200000 压气机功耗/kW 12.5 涡轮输出功率/kW 34 表 5 微型向心涡轮主要初始热力设计参数
参数名称 取值 涡轮进口总温/K 1200 涡轮进口总压/kPa 303.9 涡轮出口静压/kPa 108.5 工质流量/(kg·s−1) 0.1 转速/(r·min−1) 200000 表 6 遗传算法主要运行参数
参数名称 数值 种群大小 100 最大迭代数 500 选择方式 Roulette wheel selection 交叉概率 0.8 变异概率 0.001 表 7 微型向心涡轮一维设计所得主要参数
参数名及单位 数值 导叶出口直径DN /mm 58 叶轮进口直径D1 /mm 50 叶轮出口轮缘直径D2W /mm 40 叶轮出口轮毂直径D2n /mm 11 叶轮入口叶片高l1 /mm 9 叶轮叶片数 13 叶片厚度/mm 1 叶顶间隙/mm 0.02 轮周效率/% 93 轴效率/% 80.8 涡轮输出功率/kW 33.7 表 8 主要性能参数模拟值与一维设计值对比
参数名称 模拟计算结果 一维设计结果 偏差 轮周效率 89.5% 93% 3.7% 涡轮输出功率 33.4 kW 33.7 kW 1.5% -
[1] 龚贤武, 吴德军, 马建, 等. 增程式电动汽车动力系统参数匹配与仿真研究[J]. 机械科学与技术, 2014, 33(6): 929-933GONG X W, WU D J, MA J, et al. Parameter matching and simulation study of powertrain for extended-range electric vehicle[J]. Mechanical Science and Technology for Aerospace Engineering, 2014, 33(6): 929-933 (in Chinese) [2] GEBREHIWOT M, VAN DEN BOSSCHE A. Electric vehicle possibilities using low power and light weight range extenders[C]//European Electric Vehicle Congress. Brussels, 2014 [3] RIBAU J, SILVA C, BRITO F P, et al. Analysis of four-stroke, Wankel, and microturbine based range extenders for electric vehicles[J]. Energy Conversion and Management, 2012, 58: 120-133 doi: 10.1016/j.enconman.2012.01.011 [4] HERON A, RINDERKNECHT F. Comparison of range extender technologies for battery electric vehicles[C]//2013 Eighth International Conference and Exhibition on Ecological Vehicles and Renewable Energies (EVER). Monte Carlo: IEEE, 2013 [5] 姬芬竹, 谷可帅, 丁元章, 等. 电动汽车微型燃气轮机增程器性能仿真与起动控制的研究[J]. 汽车工程, 2016, 38(6): 661-668 doi: 10.3969/j.issn.1000-680X.2016.06.002JI F Z, GU K S, DING Y Z, et al. A research on the performances simulation and start control of micro gas turbine range extender for electric vehicles[J]. Automotive Engineering, 2016, 38(6): 661-668 (in Chinese) doi: 10.3969/j.issn.1000-680X.2016.06.002 [6] EZZAT M F, DINCER I. Development and exergetic assessment of a new hybrid vehicle incorporating gas turbine as powering option[J]. Energy, 2019, 170: 112-119 doi: 10.1016/j.energy.2018.12.141 [7] KARVOUNTZIS-KONTAKIOTIS A, ANDWARI A M, PESYRIDIS A, et al. Application of micro gas turbine in range-extended electric vehicles[J]. Energy, 2018, 147: 351-361 doi: 10.1016/j.energy.2018.01.051 [8] JI F Z, ZHANG X B, DU F R, et al. Experimental and numerical investigation on micro gas turbine as a range extender for electric vehicle[J]. Applied Thermal Engineering, 2020, 173: 115236 doi: 10.1016/j.applthermaleng.2020.115236 [9] 周雅夫, 麻笑艺, 胡晓炜, 等. 微型燃气涡轮机增程式电动汽车设计[J]. 哈尔滨工业大学学报, 2017, 49(7): 100-105 doi: 10.11918/j.issn.0367-6234.201601024ZHOU Y F, MA X Y, HU X W, et al. Design of range-extended electric vehicle with micro gas turbine[J]. Journal of Harbin Institute of Technology, 2017, 49(7): 100-105 (in Chinese) doi: 10.11918/j.issn.0367-6234.201601024 [10] FU L, FENG Z P, LI G J. Experimental investigation on overall performance of a millimeter-scale radial turbine for micro gas turbine[J]. Energy, 2017, 134: 1-9 doi: 10.1016/j.energy.2017.06.006 [11] 陈汉玉, 左承基, 滕勤, 等. 增程型电动轿车动力系统的参数匹配及试验研究[J]. 农业工程学报, 2011, 27(12): 69-73 doi: 10.3969/j.issn.1002-6819.2011.12.014CHEN H Y, ZUO C J, TENG Q, et al. Parameter matching and experimental study of powertrain for extended-range electric car[J]. Transactions of the CSAE, 2011, 27(12): 69-73 (in Chinese) doi: 10.3969/j.issn.1002-6819.2011.12.014 [12] 奚忠, 付经伦, 刘建军, 等. 小型向心透平一维和三维设计分析[J]. 航空动力学报, 2012, 27(7): 1493-1502XI Z, FU J L, LIU J J, et al. One and three-dimensional designs and analyses of small radial turbines[J]. Journal of Aerospace Power, 2012, 27(7): 1493-1502 (in Chinese) [13] 岳松, 张奥, 张燕平, 等. 中高温太阳能有机朗肯循环系统向心透平气动设计研究[J]. 机械工程学报, 2015, 51(4): 155-160 doi: 10.3901/JME.2015.04.155YUE S, ZHANG A, ZHANG Y P, et al. Aerodynamic design study of radial inflow turbine used in middle-high temperature solar organic rankine cycle system[J]. Journal of Mechanical Engineering, 2015, 51(4): 155-160 (in Chinese) doi: 10.3901/JME.2015.04.155 [14] 舒士甄. 叶轮机械原理[M]. 北京: 清华大学出版, 1991SHU S Z. Impeller mechanical principle[M]. Beijing: Tsinghua University Press, 1991 (in Chinese) [15] 苏雯雪, 黄典贵. 7 MW单级跨音离心透平设计与分析[J]. 工程热物理学报, 2020, 41(5): 1095-1101SU W X, HUANG D G. Design and analysis of 7 MW single-stage transonic centrifugal turbine[J]. Journal of Engineering Thermophysics, 2020, 41(5): 1095-1101 (in Chinese)