Full
Outline
In response to the design requirements of the nuclear island chemical and volume control system（RCV） charging pump，which no longer undertakes high‑pressure safety injection tasks and requires a steeper H-Q curve，a design method for a high‑performance centrifugal charging pump hydraulic model was proposed.Based on a single‑stage initial model pump （IMP），the impeller outlet diameter and blade outlet angle were increased，the outlet width was reduced，and the structural parameters of the diffuser were adjusted to construct two design model pumps，DMP 1# and DMP 2#.Meanwhile，analyses were conducted on the full flow range and cavitation flow under maximum operating conditions for all three pumps.The results show that compared to IMP，the best efficiency points of both DMP 1# and DMP 2# shift toward lower flow rates，and the steepness of the H-Q curves increases.At operating flow rates of 70，48，32 m3/h，the head of DMP 1# and DMP 2# increases by 14，22，24 m and 20，31，33 m，respectively.Based on entropy generation theory and the Omega vortex identification criterion，the internal flow field of the pumps was analyzed.Turbulent dissipation and wall effects are the main causes of flow losses，and under low flow conditions，entropy generation is primarily induced by vortex enhancement at the trailing edge of the impeller blade pressure side and flow separation caused by rotor‑stator interaction between the impeller and diffuser.Under the maximum operating condition at a flow rate of 70 m3/h，the Net Positive Suction Head required （NPSHr） of DMP 1# and DMP 2# is 4.3 m and 4.2 m，respectively，meeting the technical specification requirement of NPSHr<7.8 m in the nuclear power field.This study provides a theoretical basis for the design optimization and flow analysis of charging pumps.
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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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