Multi-point optimization of recirculation flow type casing treatment in centrifugal compressors

Tun, Min Thaw; Sakaguchi, Daisaku

doi:10.1007/s11630-016-0855-x

Cited by 7 publications

(11 citation statements)

References 3 publications

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“…The flow direction can also be radial in the bleed port, and air is injected far upstream of the impeller inlet. The numerical results of Tun and Sakaguchi [172] indicated that the optimum location for the bleed hole is near the splitter blade leading edge. Figure 11 presents an example of a self-circulating casing treatment in a centrifugal compressor.…”

Section: Injection Suction and Recirculationmentioning

confidence: 97%

“…Recently, the investigations have shown that, with the proper selection of casing treatment parameters, both the stall margin and the performance can be improved [170]. The most important design parameters for a self-circulating casing treatment are the width and position of the bleed slot [171][172][173], recirculation flow rate [172] and casing porosity [174].…”

Section: Injection Suction and Recirculationmentioning

confidence: 99%

See 1 more Smart Citation

Flow Control Methods and Their Applicability in Low-Reynolds-Number Centrifugal Compressors—A Review

Tiainen

Grönman

Jaatinen-Värri

et al. 2017

IJTPP

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Abstract:The decrease in the performance of centrifugal compressors operating at low Reynolds numbers (e.g., unmanned aerial vehicles at high altitudes or small turbomachines) can reach 10% due to increased friction. The purposes of this review are to represent the state-of-the-art of the active and passive flow control methods used to improve performance and/or widen the operating range in numerous engineering applications, and to investigate their applicability in low-Reynolds-number centrifugal compressors. The applicable method should increase performance by reducing drag, increasing blade loading, or reducing tip leakage. Based on the aerodynamic and structural demands, passive methods like riblets, squealers, winglets and grooves could be beneficial; however, the drawbacks of these approaches are that their performance depends on the operating conditions and the effect might be negative at higher Reynolds numbers. The flow control method, which would reduce the boundary layer thickness and reduce wake, could have a beneficial impact on the performance of a low-Reynolds-number compressor in the entire operating range, but none of the methods represented in this review fully fulfil this objective.

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Section: Injection Suction and Recirculationmentioning

confidence: 97%

Section: Injection Suction and Recirculationmentioning

confidence: 99%

Flow Control Methods and Their Applicability in Low-Reynolds-Number Centrifugal Compressors—A Review

Tiainen

Grönman

Jaatinen-Värri

et al. 2017

IJTPP

View full text Add to dashboard Cite

show abstract

“…Casing treatment is a common mean of extending compressor operating range, and study of casing treatment at inlet region of impeller has still been a research hot spot in recent years [9][10][11][12][13][14]. Latest research shows that rotating stall phenomenon is observed in flow channel of vane diffuser of centrifugal compressor [15,16], so studies of casing treatment in diffuser area and its influence on operating stability of compressor have drawn more attention in recent years, but they are still rare.…”

Section: Introductionmentioning

confidence: 99%

The influence of low-solidity and slotting combined treatment method of diffuser vanes on performance of centrifugal compressor

2019

J Braz. Soc. Mech. Sci. Eng.

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Centrifugal compressor with vane diffuser has high aerodynamic efficiency and narrow stable operating range, and study of extending its operating range has been a key and difficult point in the researching field of centrifugal compressor. In this paper, low-solidity treatment of diffuser vane is firstly adopted for a centrifugal compressor with vane diffuser, based on which slotting treatment at hub side of diffuser vane was further implemented, and then influence of this combined diffuser treatment method on the range of compressor stable operation is investigated. Results show that low-solidity treatment for diffuser vane can extend the compressor choking boundary in the full speed range and has no obvious improvement for the surge boundary; after further slotting treatment at hub side, both surge boundary and choking boundary of the compressor both increase obviously. With the increase in rotating speed, the extending effect of the stable operation range is more obvious, but this is also accompanied by an increase in aerodynamic loss. The combination treatment method of low solidity and slotting on vane hub side can be more than doubled in the stable operating range at high rotating speeds, and the effect is slightly worse at low and medium speed, compared to the vaneless diffuser treatment. Efficiency of vane diffuser compressor under low-solidity and slotting treatments can be higher than that of vaneless compressor through reasonable design of slots structure.

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“…Great progress in simulation technologies in several fields such as computational fluid dynamics (CFD), structural dynamics, and thermal analysis combined with the improved optimization algorithms makes it possible to search in global design space with automatic optimization process. Tun et al 8 studied the multipoint optimization of the recirculation flow type casing treatment and improved the adiabatic efficiency in wide flow rate condition. Tun et al 8 pointed out that optimized recirculation flow rate is one of the key parameters to maximize the adiabatic efficiency of the compressor.…”

Section: Introductionmentioning

confidence: 99%

“…Tun et al 8 studied the multipoint optimization of the recirculation flow type casing treatment and improved the adiabatic efficiency in wide flow rate condition. Tun et al 8 pointed out that optimized recirculation flow rate is one of the key parameters to maximize the adiabatic efficiency of the compressor. Tun et al 9 also studied the optimized recirculation flow type casing treatment for flow range enhancement and numerically extended the operating flow range by 107% to surge region with improved adiabatic efficiency and with no static pressure rise penalty.…”

Section: Introductionmentioning

confidence: 99%

Global optimization of recirculation flow type casing treatment in centrifugal compressors of turbochargers

Sakaguchi

Tun

Numakura

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part C:

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This paper describes a global optimization of a recirculation flow type casing treatment in centrifugal compressors of turbochargers. The global optimization for the recirculating flow type casing treatment has been performed based on the existing casing treatment. The optimization approach to the recirculation flow type casing treatment for the centrifugal compressor, incorporating meta-model assisted evolutionary algorithm, computational fluid dynamics analysis technique, artificial neural network, and genetic algorithms has been presented. For the baseline design of the casing treatment, numerical approach is validated with an experimental result from a test rig. The technical issue of the casing treatment is found to be the dropping of the adiabatic efficiency at smaller flow rate condition. In this study, the objective of the optimization is to improve adiabatic efficiency under multipoint mass flow rate conditions. The shape of the casing treatment has been parameterized by six parameters. The numerical optimization result gives the optimized recirculation casing shape, which has a possibility to improve the efficiency not only at design flow rate but also at smaller flow rate. The improvement in adiabatic efficiency at off-design point is discussed by means of the improved flow incidence at the inlet of the rotating impeller. The influence on adiabatic efficiencies at both design and off-design conditions is discussed by the sensitivity of the recirculation flow rate. It is found that the optimized design of the casing treatment provides optimized recirculation flow rate.

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Multi-point optimization of recirculation flow type casing treatment in centrifugal compressors

Cited by 7 publications

References 3 publications

Flow Control Methods and Their Applicability in Low-Reynolds-Number Centrifugal Compressors—A Review

Flow Control Methods and Their Applicability in Low-Reynolds-Number Centrifugal Compressors—A Review

The influence of low-solidity and slotting combined treatment method of diffuser vanes on performance of centrifugal compressor

Global optimization of recirculation flow type casing treatment in centrifugal compressors of turbochargers

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