Three-objective optimization of a mixed-flow pump impeller for improved suction performance and efficiency

Kim, Sung Hoon; Kim, Young Dong; Kim, Jin‐Hyuk; Choi, Young Seok

doi:10.1177/1687814019898969

Cited by 11 publications

(8 citation statements)

References 15 publications

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“…The aerodynamic characteristics of the nozzle are obtained through simulation and cascade blowing experiments on the mature blade profile. 21 It should be noted that R245fa belongs to the category of organic fluids having a high molecular weight and low sound velocity; thus, its expansion ratio is relatively large. Therefore, a cascade suitable for transonic flow is selected very carefully.…”

Section: Turbine Generatormentioning

confidence: 99%

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Experimental analysis of organic Rankine cycle power generation system with radial inflow turbine and R245fa

Lei

Liu

2014

Advances in Mechanical Engineering

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Small turbines must operate at high rotational speeds to generate adequate output power. In this study, a radial inflow turbine using R245fa as the working fluid is miniaturised and is designed to have a rotational speed of 30,000 r/min. The organic Rankine cycle system is not simplified, and a preheater and a superheater are installed. The turbine is experimentally analysed in the organic Rankine cycle system. The experimental results show that with an increase in the inlet pressure, the turbine output power and system efficiency increase; moreover, the turbine efficiency first decreases and then increases slightly after the pressure exceeds 1.5 MPa. The turbine efficiency decreases first and then increases and attains the minimum value at an inlet temperature of 100°C–105°C. When the flow rate is 0.82 m3/s, the speed reaches its maximum value of 28,000 r/min, and a maximum output power of 17.37 kW is generated. The maximum efficiency of the turbine is 0.885 and that of the system is 0.1625. The experimental data and design parameters of the turbine provide a reference for further design optimization.

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Section: Turbine Generatormentioning

confidence: 99%

“…According to previous studies, although power loss is caused by the high frequency of the generator, it also keeps within a reasonable range with the progress of technology. 24–26…”

Section: Turbine Generatormentioning

confidence: 99%

Experimental analysis of organic Rankine cycle power generation system with radial inflow turbine and R245fa

Lei

Liu

2014

Advances in Mechanical Engineering

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“…The calculated results have important engineering value for the safe operation of mixed flow pumps under unstable conditions. In addition, Kim [11,12] optimized the axial projection shape of a mixed flow pump impeller based on CFD technology, which significantly improved the cavitation performance and hydraulic performance of the mixed flow pump.…”

Section: Introductionmentioning

confidence: 99%

The Influence of a Pumping Chamber on Hydraulic Losses in a Mixed-Flow Pump

et al. 2022

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In this study, entropy generation theory based on computational fluid dynamics (CFD) is used to study the influence of a pumping chamber type (guide vane and volute scheme) on the spatial distribution of hydraulic loss in a mixed-flow pump. The CFD data of the mixed-flow pump with a volute is validated by external characteristic test data under Q = 561.4–1598.6 m3/h. The results show that the efficiency and the head of the guide vanes scheme are lower under Q = 800–1200 m3/h, which resulted from a higher total entropy production (TEP) in the pumping chamber and outlet pipe. The high total entropy production rate (TEPR) inside the guide vanes can be found near the leading edge of the hub side and trailing edge of the rim side due to flow separation, which reduces the recovery efficiency of kinetic energy of the guide vanes. The high TEPR inside outlet pipe can be seen near the inlet, caused by back flow. However, the efficiency and head of the volute scheme are lower, under Q = 1200–1600 m3/h, owing to the fact that the volute cannot effectively convert kinetic energy into pressure energy and thus the high TEPR can be found near outlet of volute and inlet of outlet pipe. These results can provide useful suggestions to the matching optimization of the impeller and pumping chamber in a mixed-flow pump.

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“…In benefiting from the development of computational fluid dynamics (CFD) technology [ 7 ], the hydraulic performance [ 8 , 9 ] and internal flow structure [ 10 , 11 ] of an axial-flow pump can be predicted accurately, which can provide a reference for hydraulic design. For instance, Shi [ 12 , 13 ] explored the effect of backflow clearance on the internal unstable flow structure and pressure pulsation characteristics of an axial-flow pump.…”

Section: Introductionmentioning

confidence: 99%

Energy Characteristics of a Bidirectional Axial-Flow Pump with Two Impeller Airfoils Based on Entropy Production Analysis

Meng

2022

Entropy

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This research sought to determine the spatial distribution of hydraulic losses for a bidirectional axial-flow pump with arc- and S-shaped impellers. The unsteady Reynolds time-averaged Stokes (URANS) approach with the SST k-omega model was used to predict the internal flow field. The total entropy production (TEP) and total entropy production rate (TEPR) were used to evaluate the overall and local hydraulic losses. The results show that the distribution of TEP and TEPR was similar for both impeller cases. Under a forward condition, TEP mainly comes from the impeller and elbow pipe. The high TEPR inside the impeller can be found near the shroud, and it shifts from the leading edge to the trailing edge with an increase in the flow rate due to the decline in the attack angle. The high TEPR inside the elbow pipe can be seen near the inlet, and the area shrinks with an increase in the flow rate caused by a reduction in the velocity circulation. Under the reverse condition, TEP mainly comes from the impeller and the straight pipe. The TEPR of the region near the shroud is obviously higher than for other regions, and the area of high TEPR near the suction side shrinks with an increase in the flow rate. The high TEPR of the straight pipe can be found near the inlet, and declines in the flow direction. These results provide a theoretical reference for future work to optimize the design of the bidirectional axial-flow pump.

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Three-objective optimization of a mixed-flow pump impeller for improved suction performance and efficiency

Cited by 11 publications

References 15 publications

Experimental analysis of organic Rankine cycle power generation system with radial inflow turbine and R245fa

Experimental analysis of organic Rankine cycle power generation system with radial inflow turbine and R245fa

The Influence of a Pumping Chamber on Hydraulic Losses in a Mixed-Flow Pump

Energy Characteristics of a Bidirectional Axial-Flow Pump with Two Impeller Airfoils Based on Entropy Production Analysis

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