Analysis of the Complex Three-Dimensional Flow Structure in the Circulation Pump of the Flow-Making System Based on Delayed Detached Eddy Simulation

Zhong Li, Lei Ding, Weifeng Gong, Dan Ni (), Cunzhi Ma and Yanna Sun
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Zhong Li: School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China
Lei Ding: School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China
Weifeng Gong: Shanghai Marine Equipment Research Institute (SMERI), Shanghai 200031, China
Dan Ni: School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China
Cunzhi Ma: School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China
Yanna Sun: School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China

Energies, 2023, vol. 16, issue 15, 1-21

Abstract: As the core component of the flow-making system, the circulating pump has differences in its internal flow structure under different operating conditions, which affects the flow quality of the environmental simulation test area and the authenticity of marine environmental simulation. To explore the internal flow characteristics and outlet evolution characteristics of the circulating pump, this paper uses the DDES (delayed detached eddy simulation) method for numerical simulation. This paper combines BVF (boundary vorticity flow) diagnosis and the limit streamline method to analyze the evolution characteristics of the unstable flow area on the blade surface; it uses the Q criterion to identify the vortex structure inside the pump and analyze its evolution and development laws. Additionally, a quantitative analysis of the flow state of the circulating pump using flow uniformity indexes is performed. The results show that the surface of impeller blades is uniform under 1.0 Q N . At 0.7 Q N , the evolution process of the blade suction surface BVF is periodic, with a corresponding period of about 2/9 T (0.02 s). At 1.0 Q N , the strength and scale of the separated vortices inside the guide vanes are minimized compared to other flow rates, and the scale and strength of the vortices show a decreasing trend along the outer normal direction. The evolution period of the separation vortex on the pressure surface of the guide vane is about 1/3 T (0.033 s) under 1.1 Q N and the evolution period of the suction surface of the guide vane is about 2/3 T (0.067 s) under 0.7 Q N . The flow uniformity indexes value downstream of the pump outlet under 1.0 Q N are very close to the ideal value; with a corresponding value of Ϛ i = 0.023, θ ¯ = 89.94°, γ = 0.95, λ = 97.9%, the outflow can be approximately regarded as axial uniform flow. The research results can provide theoretical support for the further optimization design of circulating pumps and lay the foundation for the implementation of real systems.

Keywords: flow-making system; circulating pump; internal flow characteristics; BVF; flow uniformity indexes (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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