Experimental and numerical investigation of blade height effects on micro-scale axial turbines performance using compressed air open cycle
Experimental and numerical investigation of blade height effects on micro-scale axial turbines performance using compressed air open cycle
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DOI：
10.1016/j.energy.2020.118660
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发表时间：
2020-11
期刊：
影响因子：
9
通讯作者：
Khalil M. Khalil-Khalil-M.-Khalil-30807062;S. Mahmoud;R. K. A. Dadah
中科院分区：
文献类型：
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作者：
Khalil M. Khalil-Khalil-M.-Khalil-30807062;S. Mahmoud;R. K. A. Dadah
本文通过实验和数值模拟研究了3种叶片高度（4 mm、6 mm和8 mm）对采用压缩空气开式循环的微型轴流涡轮性能的影响。利用ANSYS CFX软件对微型轴流涡轮进行了三维粘性可压缩流动的数值模拟。微型轴向涡轮机中的叶片高度对其性能有重大影响，因为它控制轴向涡轮机通道的环形面积，进而控制涡轮机的流速和功率输出。在相同的膨胀比下，增加涡轮机叶片高度将增加功率输出，而减小涡轮机叶片高度将减小功率输出。实验结果表明，当膨胀比为1.75，转速为16000 RPM时，叶片高度为4 mm、6 mm和8 mm时，最大输出功率分别为630.75W、694.1W和796.89W。压比为1.3时的最大效率分别为：47.1%、39.8%和38.83%。与实验结果的比较表明，所建立的涡轮CFD模型的有效性，效率偏差分别为+16%、+15%、+13%，输出功率偏差分别为+14.5%、+14%、+12%。
This study experimentally and numerically investigates the effects of three blade heights (4 mm, 6 mm and 8 mm) on the performance of micro-scale axial turbines using compressed air open cycle. The numerical development for the micro-scale axial turbines was developed by using ANSYS CFX software which simulates the three dimensional viscous compressible flow through turbine passages. The blade height in the micro-scale axial turbine has major impact on its performance since it controls the annular area for axial turbine passages, and in turn that will control the turbine flow rate and power output. Increasing turbine blade height will increase power output, while decreasing turbine blade height will reduce the power output at the same expansion ratio. The experimental results showed that at an expansion ratio of 1.75 and a rotational speed of 16000RPM, the maximum power produced was 630.75 W, 694.1 W, and 796.89 W for the blade heights of 4 mm, 6 mm, and 8 mm, respectively. The maximum respective efficiencies at a pressure ratio of 1.3 were: 47.1%, 39.8%, and 38.83%. Comparison with experimental results showed the validity of the developed CFD models for the turbines with deviation percentage in terms of efficiency were +16%, +15%,+13% respectively, and in terms of power output were +14.5%, +14%,+12%.