Full
Outline
To address the performance deficiencies of a molten salt pump in a 50 MW solar thermal power plant and the low flow efficiency of its flow components，the space guide vane was selected as the research subject for multi‑objective optimization design.Principal component analysis identified geometric parameters of the guide vane，determining five significant geometric parameters affecting pump performance as optimization variables：maximum outer streamline diameter of guide vane （D2），guide vane inlet angle （α1），guide vane outlet angle （α2），guide vane blade wrap angle （φ），and radial installation clearance between impeller and guide vane （L2）.Support vector regression combined with RBF neural network established surrogate models between pump efficiency，head，and optimization variables.Model accuracy was analyzed by R² method （>0.95），meeting error requirements.MOEA/D algorithm optimized geometric parameters，obtaining optimal values for the guide vane.Engineering design produced optimized guide vane prototypes.Comparative analysis examined performance impacts before and after optimization.Results show optimal parameters：D2=451 mm，a1=21.2°，a2=88.1°，φ=94.5°，L2=4.5 mm.After optimization，pump head increased by 4.98%，efficiency by 4.32%.Hydraulic performance improved significantly：pressure gradient transitions became smoother，dynamic‑static pressure energy conversion efficiency increased，flow separation vortex intensity and size reduced noticeably，hydraulic losses decreased，and flow characteristics improved substantially.This study provides reference for molten salt pump optimization design.
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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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