Influence of the volute cross-sectional shape on mixed inflow turbine performances

Meghnine, Mohamed Amine; Hamidou, Mohammad Kamal; Hamel, Mohammed

doi:10.1177/1687814017708174

Cited by 13 publications

(10 citation statements)

References 18 publications

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“…A similar study was conducted by Meghnine et al, 13 again investigating asymmetrical volute designs but this time for a mixed flow rotor. The authors observed clear vortex generation in all of designs studied and concluded that the volute volume is critical to vortex development.…”

Section: Introductionmentioning

confidence: 88%

The impact of volute aspect ratio and tilt on the performance of a mixed flow turbine

Lee

Barrans

Nickson

2021

Proceedings of the Institution of Mechanical Engineers, Part A:

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Current trends in the automotive industry towards engine downsizing means turbocharging now plays a vital role in engine performance. The purpose of turbocharging is to increase the engine inlet air density by utilising, the otherwise wasted energy in the exhaust gas. This energy extraction is commonly accomplished through the use of a radial turbine. Although less commonly used, mixed flow turbines can offer aerodynamic advantages due to the manipulation of blade leading (LE) angles, improving performance at low velocity ratios. The current paper investigates the performance of a mixed flow turbine with four volute designs, two radial and two tilted volutes each with one variant with an aspect ratio (AR)=0.5 and one with AR = 2. To ensure constant mass flow parameter (MFP) for aerodynamic similarity, volute area to radius ratio (A/r) was manipulated between the design variants. The maximum variation of cycle averaged normalized efficiency measured between the designs was 2.87%. Purely in the rotor region, the variation in normalized cycle averaged efficiency was 3%. The smallest volute AR designs showed substantial secondary flow development. The introduction of volute tilt further complicated the secondary flow development with the introduction of asymmetry to the flows. It was established that both AR and tilt have a notable effect on secondary flows, rotor inlet conditions and over all mixed flow turbine performance.

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Section: Introductionmentioning

confidence: 88%

The impact of volute aspect ratio and tilt on the performance of a mixed flow turbine

Lee

Barrans

Nickson

2021

Proceedings of the Institution of Mechanical Engineers, Part A:

View full text Add to dashboard Cite

show abstract

“…Aerospace 2017, 4, 56 4 of 21 a mixed flow rotor design was investigated by [10]. The authors observed clear vortex generation in each housing design and concluded that the volute can be occupied by one or more vortices and that the volute volume is critical in decreasing the number of vortices.…”

Section: Turbine Designmentioning

confidence: 99%

“…A similar study was conducted by [10]. In this case asymmetrical housing designs were once again used with four variants.…”

Section: Introductionmentioning

confidence: 99%

“…In this case asymmetrical housing designs were once again used with four variants. However, whereas the study in [11] was conducted on a radial turbine, a mixed flow rotor design was investigated by [10]. The authors observed clear vortex generation in each housing design and concluded that the volute can be occupied by one or more vortices and that the volute volume is critical in decreasing the number of vortices.…”

Section: Introductionmentioning

confidence: 99%

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The Impact of Volute Aspect Ratio on the Performance of a Mixed Flow Turbine

et al. 2017

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Current trends in the automotive industry towards engine downsizing mean turbocharging now plays a vital role in engine performance. A turbocharger increases charge air density using a turbine to extract waste energy from the exhaust gas to drive a compressor. Most turbocharger applications employ a radial inflow turbine. However, mixed flow turbines can offer non-zero blade angles, reducing leading edge (LE) separation at low velocity ratios. The current paper investigates the performance of a mixed flow turbine with three different volute aspect ratio (AR) designs (AR = 0.5, 1 and 2). With constant A/r (ratio of volute area to centroid radius), the AR = 0.5 volute design produced a 4.3% increase in cycle averaged mass flow parameter (MFP) compared to the AR = 2 design. For the purpose of performance comparison, it was necessary to manipulate the volute A/r's to ensure constant MFP for aerodynamic similarity. With the volute A/r's manipulated to ensure constant MFP for aerodynamic similarity, the maximum variation of cycle averaged normalized efficiency measured between the designs was 1.47%. Purely in the rotor region, the variation in normalized cycle averaged efficiency was 1%. The smallest tested volute aspect ratio showed a significant increase in volute loss while the ARs of 1 and 2 showed similar levels of loss. The smallest AR volute showed significant secondary flow development in the volute. The resulting variation in LE incidence was found to vary as a result.

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“…Their results show that the twin-entry turbine provides the best compromise in terms of performances at different pressure ratio and significant increase in swallowing capacity. The investigation of Meghnine et al [16] on volute crosssectional shape of mixed inflow turbine reveals that flattened volute cross section in the radial direction achieves significant Mach number values reaching the highest swallowing capacity. This paper presents the development of a new twinentry turbine volute design shown on Figure 1.…”

Section: Introductionmentioning

confidence: 98%

The separation wall effect of a volute twin entry cross section area on the mixed inflow turbine performance

et al. 2020

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The pulse turbocharging system is used in many diesel engines and it is fortunate that nozzleless mixed turbines allow unsteady flow with less performance losses. It operates with a double or sometimes triple-entry casing creating different flow regimes in each sector. A nozzleless casing is used. The division of the cross section area takes the form of a solid wall in the radial plane. When the flow rate through one or the other volute inlet drops to zero, some reverse flow is observed from the other inlet. This situation suffers undesirable effects, diminishing the benefits of the divided volute casing types. A numerical investigation on the effect of the length of the dividing wall in the radial plane is performed using the ANSYS code. This possibility is explored and the results show that extending the wall to a limiting length enhances the flow behavior with better performance.

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Influence of the volute cross-sectional shape on mixed inflow turbine performances

Cited by 13 publications

References 18 publications

The impact of volute aspect ratio and tilt on the performance of a mixed flow turbine

The impact of volute aspect ratio and tilt on the performance of a mixed flow turbine

The Impact of Volute Aspect Ratio on the Performance of a Mixed Flow Turbine

The separation wall effect of a volute twin entry cross section area on the mixed inflow turbine performance

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