Optimization of Turbocharger Ported Shroud Compressor Stages

Yin, Jun; Li, Penny; Pees, Stephane

doi:10.1115/gt2009-59248

Cited by 11 publications

(7 citation statements)

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“…In this study, the diameter of the holes is 3 mm, the radial position of the holes is [13]; (b) sketch in ref. [12]. The commercial software package NUMECA/FINE Turbo v. 8.4-1 was used to simulate the flow fields in a single impeller passage with and without the holed casing treatment.…”

Section: Numerical Modelmentioning

confidence: 99%

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Performance of a centrifugal compressor with holed casing treatment in the large flowrate condition

Wang

2011

Sci. China Technol. Sci.

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As demonstrated by former work, the holed casing treatment can be used to expand the stall margin of a centrifugal compressor with unshrouded impeller. In addition, the choked margin can also be expanded as experimental results indicated. Moreover, the compressor performance, especially the efficiency, on the whole working range is improved. As shown by experiments, the stall margin and choked margin of the compressor are extended, and the maximum efficiency improvement is 14% at the large flowrate of 1.386. Numerical simulations were carried out to analyze the flow in the impeller and in the holes in the case of large flowrate. The results indicate that in large flowrate conditions, there is a low-pressure region on the throat part of the impeller passage, leading to the bypass flows appearing in the holes, which means the flow area at the inlet of the impeller is increased. The bypass flow can also contribute to the decrease of the Mach number at the throat part near the shroud end-wall which implies that the choked margin is expanded. Besides, as the bypass flow would inhibit the development of the vertexes in the tip clearance and suppress the flow recirculation in the shroud end-wall region, both the pressure ratio and efficiency of the compressor are improved, which agrees well with the experiments. holed casing treatment, centrifugal compressor, numerical simulations, large flowrate condition Citation:Xu W, Wang T, Gu C G. Performance of a centrifugal compressor with holed casing treatment in the large flowrate condition.

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Section: Numerical Modelmentioning

confidence: 99%

“…Later on the application to centrifugal compressors was carried out [9,10]. As for turbocharger compressors, a ring-groove structure is used to enhance the stable range [11,12]. It was first suggested by Fisher [13] and the sketches are shown in Figures 1(a) and 1(b).…”

Section: Introductionmentioning

confidence: 99%

Performance of a centrifugal compressor with holed casing treatment in the large flowrate condition

Wang

2011

Sci. China Technol. Sci.

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“…This is proved to give a better compressor operability range as compared to the solid shroud compressors. Recently, an increasing amount of research is been carried out on Ported Shroud geometries to compare its performance over the solid shroud geometries [1][2][3]. Several parameters such as port and slot width, their locations, their inclination etc.…”

Section: Introductionmentioning

confidence: 99%

Casing Treatment of Centrifugal Compressors

Noushad

Dhamarla

Kumar

2015

ASME 2015 Gas Turbine India Conference

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The operating range of any compressor is controlled by Surge and Choke. Surge occurs at lower mass flow rates with large pressure fluctuations and flow reversals, while choke occurs at higher mass flow rates when the flow rate reaches the limit which compressor can discharge. Ported shroud is a cost effective casing treatment that can greatly improve operating range of centrifugal compressors. By removing the stagnant and reverse flow from shroud wall boundary-layer region and recirculating it to impeller inlet, it has been demonstrated that larger range of operability can be achieved without much loss on compressor efficiency. This paper demonstrates the improvement of a centrifugal compressor operational range with ported shroud configuration.A series of CFD simulations were carried out with open source centrifugal compressor geometry (NASA HPCC 4:1) to create performance characteristics/speed-lines. The CFD methodology and practices were validated by comparing the results with the experimental data. Performance evaluation of ported shroud configuration is done with respect to solid shroud.Ported shroud compressor is proven to give higher choke mass flow and also a better surge margin compared to the Solid shroud model. The phenomena of in-flowing and outflowing port have also been demonstrated. Emphasis was given to understand how ported shroud helps to achieve a better performance. A design optimization study has also been carried out in order to establish the optimum ported shroud configuration. Design parameter such as port location has been selected and the effect of this parameter on the performance of the compressor is studied using CFD. Optimum port geometry was proposed.

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“…Tamaki 15,16 applied a guiding vane inside the recirculation cavity of the SRCT on a high-pressure-ratio turbocharger compressor and has obtained a higher surge margin. Yin et al 17 used the design-of-experiments method to optimize a turbocharger compressor with a ported shroud. In their research, several compressor parameters, such as the volute throat, the diffuser width, and the port location were optimized to improve the compressor performance.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigation of a compressor with active self-recirculation casing treatment for a wide operation range

Sun

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part D:

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A turbocharger compressor with a wide flow range and a high efficiency is important to the application of advanced clean combustion technologies, such as homogeneous charge compression ignition and low-temperature combustion, in diesel engines. Self-recirculation casing treatment is one of the techniques that can extend the compressor surge margin without much efficiency penalty. The underlying physics of the self-recirculation casing treatment technology were investigated with computational fluid dyamics modeling and bench testing in this study. It is identified that, if the bleed slot of the self-recirculation casing treatment is located upstream of the impeller passage’s throat area, self-recirculation casing treatment improves the surge margin but the throat still limits the maximum flow capacity of the compressor. On the other hand, if the bleed slot of the self-recirculation casing treatment is located at the impeller passage’s throat area, the self-recirculation casing treatment improves the maximum flow capacity but results in a significant compressor efficiency penalty in the low-flow range. An active self-recirculation casing treatment design was proposed. The active self-recirculation casing treatment design extends the compressor flow capacity and improves the surge margin without an efficiency penalty through dual bleed slots with one upstream and the other downstream of the leading edge of the splitter blades. In the choke condition, the upstream bleed slot will be closed; near the surge condition, the downstream bleed slot will be closed. In the middle flow range, both bleed slots are closed. Both the numerical data and the bench testing results show that the maximum flow rate could be extended by about 15% and the surge margin by about 20% without an efficiency penalty. The mechanism of the performance improvement is also numerically studied.

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Optimization of Turbocharger Ported Shroud Compressor Stages

Cited by 11 publications

References 0 publications

Performance of a centrifugal compressor with holed casing treatment in the large flowrate condition

Performance of a centrifugal compressor with holed casing treatment in the large flowrate condition

Casing Treatment of Centrifugal Compressors

Numerical and experimental investigation of a compressor with active self-recirculation casing treatment for a wide operation range

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