A two-dimensional method for radial turbine volute design

Li, Chao; Wang, Yu; Li, Xiangjun; Chen, Hua; Wei, Yi; Wu, Guitao

doi:10.1177/09576509221109070

Cited by 3 publications

(5 citation statements)

References 28 publications

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“…This is consistent with the total pressure loss coefficients in Figure17and the efficiency results in Figure14. It is consistent with the results in the literature 24.…”

supporting

confidence: 94%

“…To see the effects of A/R distributions on the losses in turbines, a component-wise loss breakdown is conducted, which is shown in Figure 17. 24,28…”

Section: Resultsmentioning

confidence: 99%

“…To see the effects of A/R distributions on the losses in turbines, a component-wise loss breakdown is conducted, which is shown in Figure 17. 24,28 It can be seen from Figures 14 and 17 that turbine efficiency is correlated to the total pressure loss coefficient. The loss coefficient of the baseline turbine is the smallest, and that of Case 4 is the largest.…”

Section: Impact Of Volute A/r Distributionmentioning

confidence: 96%

“…The volutes are generated with an improved 2D design method. 24 Their cross-sectional shapes are circular, rectangular, and trapezoidal, respectively. They have the same maximum radial height and their A/R distributions, as shown in Figure 10(d), are also the same.…”

Section: Impacts Of Volute Cross-sectional Shapesmentioning

confidence: 99%

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Secondary flows and losses in radial turbine volutes

Chen

Wang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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Secondary flows had been found in radial turbine volutes in the past, but the flow mechanisms governing their existence are far from clear. This paper describes an analytic and numerical work on the mechanism of the secondary flows, and the effects of volute shape, A/R distribution, and turbine speed on the development and associated losses of the secondary flows in the turbine volutes. The results show that the centrifugal and viscous forces acting on the wall boundary-layer, as well as the diffusion of radial flow in volute’s cross-sections, are the main generating mechanism of secondary flows, but they are worked against by volute discharging. Compared with the rectangular and trapezoidal shape volutes, the circular volute generates stronger secondary flows, resulting in no hydrodynamic benefit over the other two volutes. By using the dissipation function to separate the secondary flow loss from the total loss in the three volutes, it shows for the first time that although the loss from secondary flows alone is small, the flows can push the main flows toward volute side walls thereby increase wall friction loss. Three twin-entry volutes with different aspect ratios of their cross-sections are also studied. The offset of the cross-section center to volute exit affects volute discharging and the aspect ratio impacts on the radial flow in sidewall boundary layers, they therefore influence the secondary flows in the volutes. The slope of A/R curves is found to correlate well to the strength of the secondary flows in the volutes, and the reason behind is explained. Turbine speed’s influence on the secondary flows is largely through flow compressibility, and if the speed change reduces turbine inlet Mach number, it will increase discharge flow angle at the volute exit, and so too the strength of the secondary flows, but the changes will be small.

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“…This is consistent with the total pressure loss coefficients in Figure17and the efficiency results in Figure14. It is consistent with the results in the literature 24.…”

supporting

confidence: 94%

“…To see the effects of A/R distributions on the losses in turbines, a component-wise loss breakdown is conducted, which is shown in Figure 17. 24,28…”

Section: Resultsmentioning

confidence: 99%

Section: Impact Of Volute A/r Distributionmentioning

confidence: 96%

Section: Impacts Of Volute Cross-sectional Shapesmentioning

confidence: 99%

See 2 more Smart Citations

Secondary flows and losses in radial turbine volutes

Chen

Wang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…The volute, also known as the spiral casing, is a flow-through component in a centrifugal pump that converts liquid energy [36]. From a hydraulic perspective, it has the advantages of a wide high-efficiency region and broad applicability [37].…”

Section: Three-dimensional Modeling Of Volutementioning

confidence: 99%

Design and Implementation of a Three-Dimensional CAD Graphics Support Platform for Pumps Based on Open CASCADE

Liu

Yuan

et al. 2023

Processes

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In the pump industry, designers commonly utilize mainstream three-dimensional computer-aided design (CAD) software (Unigraphics NX 12.0 and SolidWorks 2023). However, these CAD packages are generic and not optimized for the specific requirements of the pump industry. This leads to a lack of flexibility and increased complexity in their usage, as well as higher computational demands, resulting in elevated learning and operational costs. Additionally, there are concerns about potential information leaks and software restrictions. In this paper, we studied the organization architecture of commercial three-dimensional CAD software, and compared and analyzed the geometric kernels and rendering engines of mainstream three-dimensional software. Using the Open CASCADE geometric kernel and OpenSceneGraph rendering engine, together with the Visual Studio 2021 development environment and Qt interface library, we developed an autonomous copyright three-dimensional CAD graphics support platform for pumps. Based on the three-dimensional platform, we tested the commonly used graphics elements and basic algorithms required for pump modeling, and successfully designed and modeled the impeller and volute casing of a centrifugal pump. Through computational simulations and experimental verifications, we demonstrated that the accuracy and precision of the pump model designed on this platform meets the design requirements, indicating that this platform has practical pump design and modeling capabilities. Compared to commercial three-dimensional CAD software, this platform exhibits superior flexibility and interactivity in three-dimensional modeling that is specifically tailored for pump products. Consequently, it fully satisfies the needs for three-dimensional parameterized modeling and visualization of pumps.

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An investigation of the effects of volute A/R distribution on radial turbine performance

Chen

Wang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part D:

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In order to meet the higher design requirements of radial turbines, it is necessary to clearly understand the impact of different design parameters on turbine performance. The A/R distribution is one of the most important design parameters for the radial turbine volute, but there are few studies on it. To clarify the effect of A/R distribution on turbine efficiency and blade excitation force, a detailed comparative study is carried out. An experimentally validated numerical method is used, and steady and unsteady CFD simulations are conducted in this study. The results show that the volute A/R distribution has a significant effect on the turbine efficiency, while a linear distribution can provide a more uniform inlet condition and thus improve the rotor efficiency. The flow parameters fluctuated significantly at the volute tongue. Although the efficiency is not sensitive to this fluctuation, it directly affects the excitation force on the rotor blades. The volute with S-shaped A/R distribution produces the smallest excitation force due to the smallest fluctuation. Two new A/R distributions are presented which combine the advantages of linear and S-shaped or convex A/R distributions with high efficiency and low excitation force. It is suggested that the A/R should be close to the linear distribution and decreases rapidly before the tongue.

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A two-dimensional method for radial turbine volute design

Cited by 3 publications

References 28 publications

Secondary flows and losses in radial turbine volutes

Secondary flows and losses in radial turbine volutes

Design and Implementation of a Three-Dimensional CAD Graphics Support Platform for Pumps Based on Open CASCADE

An investigation of the effects of volute A/R distribution on radial turbine performance

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