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To investigate the influence of guide vane height on downstream helical flow in a guide-vane swirl generator, numerical simulations and physical experiments were combined. Five swirl generator models with varying guide vane heights were designed to systematically analyze circumferential velocity distribution, streamwise evolution of mean circumferential velocity, and helical flow attenuation characteristics. Results indicate that the downstream circumferential velocity follows a counterclockwise rotational distribution. With increasing guide vane height, the distribution regions of circumferential velocity and angular momentum were observed to expand significantly, resulting in enhanced helical flow intensity. The mean circumferential velocity was found to decay exponentially along the streamwise direction, though its attenuation rate showed minimal dependence on guide vane height. At a fixed downstream cross-section, the mean circumferential velocity increased with guide vane height, but this growth rate decreased progressively. When the height exceeded 35 mm, further increases had negligible effects on velocity enhancement, suggesting optimal swirl generation at 35 mm. These findings provide a theoretical foundation for the structural optimization of guide-vane swirl generators.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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