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摘要:
为了分析带螺旋静叶诱导轮的内部流动规律，利用计算流体力学（CFD）方法对带螺旋静叶诱导轮进行了仿真计算，研究了其扬程特性和气蚀性能。结果显示，安装螺旋静叶后，使诱导轮的扬程得到很大提升，但是因为螺旋静叶流道中回流较强，增大了回流损失，导致效率下降。随着诱导轮入口压力降低，带螺旋静叶诱导轮的气蚀区域受离心力作用，沿径向发展，由于堵塞螺旋静叶流道，推迟了诱导轮流道的堵塞时间，从而使诱导轮的气蚀性能得到改善。
Abstract:In order to study internal flow pattern, the 3D flow in inducer with helical static blades is numerically computed by using the computational fluid dynamics (CFD). The suction and cavitation performance of the inducer are analyzed. The results show that the head increases with helical static blades, while the efficiency decreases resulted from the strong backflow in helical static blade channels. As the inlet pressure decreases, the cavitation develops along the radial direction, which is influenced by the centrifugal force. The choked helical static blade channels delay the appearance time of blocked inducer, so the cavitation performance of the inducer with helical static blades is improved.
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Key words:
- inducer /
- helical static blade /
- head /
- backflow /
- cavitation performance
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图 4 诱导轮数值计算与实验曲线对比
Figure 4. Comparison of numerical calculation and experimental curves of inducer
图 7 诱导轮子午面轴向速度分布和流线
Figure 7. Axial velocity distribution and streamline on meridional plane of inducer
图 10 NPSH=5.70 m时不同网格数预测的诱导轮入口的静压分布和气穴分布(fv=10%)
Figure 10. Static pressure and cavitation distribution of inducer inlet calculated by different mesh numbers at NPSH=5.70 m (fv=10%)
图 12 原诱导轮流道内的气穴分布(fv=10%)
Figure 12. Cavitation distribution in original inducer channel (fv=10%)
图 13 带螺旋静叶诱导轮流道内的气穴分布(fv=10%)
Figure 13. Cavitation distribution in inducer channel with helical static blades (fv=10%)
图 14 带螺旋静叶诱导轮入口fv分布
Figure 14. fv distribution at inlet of inducer with helical static blades
表 1 诱导轮主要参数
Table 1. Main parameters of inducer
参数 外径/mm 叶片数 螺距/mm 轮毂直径/mm 数值 188.6 3 160 89.8 
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表 2 螺旋静叶主要参数
Table 2. Main parameters of helical static blades
参数 内径/mm 叶片数 螺距/mm 外径/mm 数值 192.6 3 160 240
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表 3 NPSH=5.70 m时不同网格数预测的诱导轮扬程
Table 3. Head of inducer calculated by different mesh numbers at NPSH=5.70 m
网格数/万 131 178 200 扬程/m 7.01 6.74 6.73
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