Switchable dual-port casing treatment scheme for an enhanced turbocharger compressor operating range

Sun, Harold; Hu, Lingqian; Zhang, Juan; Hanna, Dave; Krivitzky, Eric; Larosiliere, Louis M.; M-C, Lai; Yang, Ce

doi:10.1177/0954407012467288

Cited by 9 publications

(6 citation statements)

References 10 publications

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“…Furthermore, Zheng et al 4 tried to address the non-axisymmetric pressure distribution of a centrifugal compressor by including a ported shroud whereby the slot position within the impeller passage varied axially; more recently, Wang et al 5 showed that the non-axisymmetric placement of vanes in the cavity can improve the impeller and diffuser flow fields towards surge. More complex systems were also reported by Tomita et al 6 and Sun et al 7 Tomita combined a ported shroud with inlet guide vanes which improved map width but sacrificed efficiency, and Sun added a second slot in the impeller passage to further increase the maximum capacity (but this system was no longer passive). All of these devices have an annular cavity which extends axially towards the compressor inlet pipe (Figure 2(a)), and the problem with this is the design space.…”

Section: Introductionmentioning

confidence: 85%

“…6 and Sun et al. 7 Tomita combined a ported shroud with inlet guide vanes which improved map width but sacrificed efficiency, and Sun added a second slot in the impeller passage to further increase the maximum capacity (but this system was no longer passive). All of these devices have an annular cavity which extends axially towards the compressor inlet pipe (Figure 2(a)), and the problem with this is the design space.…”

Section: Introductionmentioning

confidence: 99%

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Axial groove casing treatment in an automotive turbocharger centrifugal compressor

Harley¹,

Starke²,

Bamba³

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part C:

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The automotive market is continually driving the suppliers of turbochargers to push their designs into new unexplored realms. The most recent request is to have improvements to the surge margin at higher pressure ratios due to the demands of modern Diesel and gasoline engines. This study looked back at historic casing treatments and investigated the concept of axial grooves being applied to the shroud of a centrifugal compressor. This paper presents a literature review of previous centrifugal compressor casing treatments and explores in detail the axial groove type casing treatment. The study is comprised of two main sections, a test campaign and a numerical investigation. The test campaign compares the axial groove casing treatment against a baseline case without a casing treatment and a typical ported shroud casing treatment. Results are presented along with an explanation of the changes to the performance over the baseline case. The axial groove casing treatment is shown to be able to improve the surge margin as desired in a very package orientated manner. The second part of this paper looks at a similar axial groove casing treatment but for a different centrifugal compressor stage. A computational fluid dynamics (CFD) study was carried out to investigate and provide understanding to the fluid mechanics surrounding the axial groove casing treatment. The CFD and test data are not compared; rather an independent CFD study explains the basic mechanics of how the axial grooves interact with the impeller in order to explain the performance changes seen between a baseline case, and a case including the axial groove casing treatment. Axial grooves at the impeller inlet are shown to be an effective method of improving the surge margin with a limited effect on efficiency, whilst working within a package restricted design space.

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Section: Introductionmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Axial groove casing treatment in an automotive turbocharger centrifugal compressor

Harley¹,

Starke²,

Bamba³

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

show abstract

“…The numerical study revealed that [12] the introduction of split blades may introduce shock wave induced blockages at near choke conditions and unlike the other viscous related aerodynamic blockages, these shock wave induced blockages near the leading edge of splitters may be utilized to extend the choke flow capacity. Figure 3 illustrates the CFD predicted flow field of a transonic compressor impeller near choke condition.…”

Section: Fig 1 Customer Driving Cycles and Rated Power Conditions Rmentioning

confidence: 97%

“…Extensive numerical analyses have greatly assisted the optimization process, leading to advanced compressor and mixed-flow turbine that has superior efficiency over wide operation range [12].…”

Section: Fig 1 Customer Driving Cycles and Rated Power Conditions Rmentioning

confidence: 99%

Experimental Evaluation of Advanced Turbocharger Performance on a Light Duty Diesel Engine

Sun

Hanna

Niessen

et al. 2013

SAE Int. J. Engines

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Engine manufacturers are continually faced with the challenges of meeting more stringent emission regulations while maintaining the customer requirements for fuel economy improvement. This challenge has required future turbochargers to have good efficiency at low flow area and sufficient surge margin, while customer demand and market competition drive for high power or high power density characteristics. This combination of competing requirements translates into turbocharger designs that have high efficiency over wide operation range on both the turbine and compressor. Instead of having two or three turbochargers arranged in series, or parallel and operated sequentially, as some auto manufacturers have successfully demonstrated in production vehicles [1,2], this project focused on a singlestage turbocharger solution for high-efficiency operation over wide operation range. A single-stage solution provides benefits from constraints on packaging, cost, durability, and potential heat dissipation concerns in the boost system. ABSTRACTFor diesel engines to meet current and future emissions levels, the amount of EGR required to reach these levels has increased dramatically. This increased EGR has posed big challenges for conventional turbocharger technology to meet the higher emissions requirements while maintaining or improving other vehicle attributes, to the extent that some OEMs resort to multiple turbocharger configurations. These configurations can include parallel, series sequential, or parallelseries turbocharger systems, which would inevitably run into other issues, such as cost, packaging, and thermal loss, etc.This study, as part of a U.S. Department of Energy (USDoE) sponsored research program, is focused on the experimental evaluation of the emission and performance of a modern diesel engine with an advanced single stage turbocharger.A production IHI (Ishikawajima Harima Heavy Industries) turbocharger was selected as the base architecture for the turbocharger design with optimizations focused on compressor impeller and turbine wheel designs.An advanced impeller design was used on the compressor side to improve the efficiency and surge margin at low mass flow areas of the compressor map, allowing greater EGR flow while extending the flow capacity by using an active casing treatment on the compressor cover.Mixed flow turbine technology was used on the turbine side, due to its performance characteristics; particularly high efficiency at low speed ratios relative to the base conventional radial flow turbine. This characteristic is relevant to increased EGR operation required for future diesel applications.Both steady state and transient engine dynamometer testing of FTP transient cycles at Tier II Bin 5 emission levels show that the advanced turbocharger technology enables around 3% fuel economy improvement on the engine while meeting the same emissions level.

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“…The surge margin of turbocharger compressor was extended without much decrease in the efficiency. Hu et al 4 and Sun et al 5 investigated the switchable dual-port casing treatment for a turbocharger compressor. The underlying mechanism of the self-recirculation casing treatment technology was investigated with computational fluid dynamics modeling and bench testing.…”

Section: Introductionmentioning

confidence: 99%

Experimental research on stability enhancement for centrifugal compressors using active control casing treatment system

Zhao

Yang

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part A:

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Centrifugal compressors are widely used in many fields, where they become unstable when operated at the edge of the surge line. This paper presents a method, which is based on the active control casing treatment to enhance the operating stability of the centrifugal compressor. To investigate the effect of the active control casing treatment system on the performance of a centrifugal compressor, a test rig with rotating speed of 15,000 r/min was built up. The experimental results show that the active control casing treatment system can significantly decrease the surge flow rate and extend the envelope of stable operation via injecting gas (so-called the control gas) into the casing of the centrifugal compressor. The tested maximal enhancement ability is 30.55% at the condition of 10,586 r/min when the flow rate of the control gas is 2.5 m3/min. It was found that the enhancement ability increases with the decrease of the rotating speed of the centrifugal compressor. The increment of the control gas flow rate results in a smaller surge flow rate of the centrifugal compressors.

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Switchable dual-port casing treatment scheme for an enhanced turbocharger compressor operating range

Cited by 9 publications

References 10 publications

Axial groove casing treatment in an automotive turbocharger centrifugal compressor

Axial groove casing treatment in an automotive turbocharger centrifugal compressor

Experimental Evaluation of Advanced Turbocharger Performance on a Light Duty Diesel Engine

Experimental research on stability enhancement for centrifugal compressors using active control casing treatment system

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