Influence of pulse frequencies on fluid flow of a twin entry radial turbine rotor inlet
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摘要:
为了更好地了解脉冲频率对双通道涡轮转子进口流动特性的影响，应用ANSYS CFX软件对不同频率（20、40、80 Hz）脉冲进气条件下的双通道径向涡轮进行了非稳态数值计算，探究了进气脉冲频率对双通道涡轮转子进口入射角的影响，并进一步分析了脉冲频率对转子下游流场的影响。结果表明：脉冲频率对转子进口入射角的影响较大，一个脉冲周期内，转子进口入射角出现两个波峰和两个波谷，波峰附近入射角随频率升高而减小，波谷附近入射角随频率升高而增大；入射角沿叶高分布规律可以发现，叶根部分和叶高部分入射角随频率变化趋势相反，另外，叶根分支进口压力更大时，双通道涡轮进口流动特性更稳定。
Abstract:In order to better understand the impact of pulse frequency on the flow characteristics of the twin entry turbine rotor inlet, ANSYS CFX software was applied to numerical calculation of two-channel radial turbines with different frequencies (20, 40, 80 Hz) under the condition of pulse intake, while the distribution law of rotor inlet incidence angle in one pulse period, and the distribution law of blade height and circumferential direction were obtained. The results showed that in one pulse period, there were two peaks and two troughs in the incidence angle of the rotor inlet, the incidence angle near the crest decreased with the increase of frequency, and the incidence angle near the trough increased with the increase of frequency. The incidence angle distribution along the blade height took 0.5 blade height as the dividing point, and the incidence angle of the blade root part and the blade height part presented an opposite trend with the frequency. When the inlet pressure of blade root branch was larger, the inlet flow characteristics of twin entry turbines were more stable.
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Key words:
- pulse flow /
- pulse frequency /
- twin entry radial turbine /
- incidence angle /
- rotor inlet
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图 4 试验与仿真涡轮特性对比
Figure 4. Turbine performance comparison between experiment and calculation
图 5 不同脉冲频率条件下涡轮进口压力和温度
Figure 5. Turbine inlet pressure and temperature at different pulse frequencies
图 6 不同脉冲频率条件下涡轮转子进口入射角随脉冲相角变化规律
Figure 6. Variation of incidence angle of turbine rotor inlet with pulse phase angle at different pulse frequencies
图 7 不同脉冲频率条件下一个脉冲周期内转子进口入射角平均值
Figure 7. Average incidence angle of rotor inlet in a pulse period at different pulse frequencies
图 8 脉冲频率为20 Hz进气条件所选工况点对比
Figure 8. Comparison of intake conditions at pulse frequency of 20 Hz
图 9 不同脉冲频率进气条件下hub-升/降两工况转子进口入射角沿叶高分布规律
Figure 9. Rotor inlet incidence angle distribution along blade height under hub-rise/fall conditions at different pulse frequencies
图 10 不同脉冲频率条件下hub-升/降两工况转子进口静熵分布
Figure 10. Rotor inlet static entropy distribution under hub-rise/fall conditions at different pulse frequencies
图 11 不同脉冲频率进气条件下shr-升/降两工况转子进口入射角沿叶高分布规律
Figure 11. Rotor inlet incidence angle distribution along blade height under shr-rise/fall conditions at different pulse frequencies
图 12 不同脉冲频率条件下shr-升/降两工况转子进口静熵分布
Figure 12. Rotor inlet static entropy distribution under shr-rise/fall conditions at different pulse frequencies
图 13 不同脉冲频率条件下hub-升/降两工况转子进口周向入射角分布
Figure 13. Distribution of circumferential incidence angle of rotor inlet under hub-rise/fall conditions at different pulse frequencies
图 14 不同脉冲频率条件下shr-升/降两工况转子进口周向入射角分布
Figure 14. Distribution of circumferential incidence angle of rotor inlet under shr-rise/fall conditions at different pulse frequencies
图 15 不同脉冲频率条件下hub/shr-升两工况转子前缘流线分布及转子通道熵值分布
Figure 15. Rotor leading edge flow line distribution and rotor channel entropy distribution under hub/shr-rise conditions at different pulse frequencies
表 2 不同频率脉冲条件下i平均值与标准差（hub-升工况，0.8叶高位置）
Table 2. Mean value and standard deviation of i under different pulse frequencies （hub-rise condition,0.8 blade height position）
频率/Hz 平均值/（°） 标准差/（°） 20 8.9 18.3 40 10.9 18.6 80 11.2 18.4 
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表 3 不同频率脉冲条件下i平均值与标准差（hub-降工况，0.2叶高位置）
Table 3. Mean value and standard deviation of i under different pulse frequencies （hub-fall condition,0.2 blade height position）
频率/Hz 平均值/（°） 标准差/（°） 20 5.4 25.9 40 7.5 25.8 80 11.8 25.7
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表 4 不同频率脉冲条件下i平均值与标准差（shr-升工况，0.2叶高位置）
Table 4. Mean value and standard deviation of i under different pulse frequencies （shr-rise condition,0.2 blade height position）
频率/Hz 平均值/（°） 标准差/（°） 20 −7.5 16.7 40 −4.9 18.8 80 −1 20
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表 5 不同频率脉冲条件下i平均值与标准差（shr-降工况，0.8叶高位置）
Table 5. Mean value and standard deviation of i under different pulse frequencies （shr-fall condition,0.8 blade height position）
频率/Hz 平均值/（°） 标准差/（°） 20 23.8 32.3 40 25.2 31.1 80 26.1 31.5
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