Design Optimization and Experimental Study of Tandem Impeller for Centrifugal Compressor

Ju, Yaping; Zhang, Chuhua

doi:10.2514/1.b34933

Cited by 21 publications

(9 citation statements)

References 17 publications

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“…In the metamodeling technique to build a surrogate model, DoE can be employed to generate appropriate training samples [12]. Barsi et al optimized the geometry of a return channel for a centrifugal compressor through the artificial neural network (ANN) method which is trained using a database of 3D CFD solutions created with a DoE technique [13].…”

Section: Introductionmentioning

confidence: 99%

Optimization of a Centrifugal Compressor Using the Design of Experiment Technique

Mojaddam

Pullen

2019

Applied Sciences

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Centrifugal compressor performance is affected by many parameters, optimization of which can lead to superior designs. Recognizing the most important parameters affecting performance helps to reduce the optimization process cost. Of the compressor components, the impeller plays the most important role in compressor performance, hence the design parameters affecting this component were considered. A turbocharger centrifugal compressor with vaneless diffuser was studied and the parameters investigated included meridional geometry, rotor blade angle distribution and start location of the main blades and splitters. The diffuser shape was captured as part of the meridional geometry. Applying a novel approach to the problem, full factorial analysis was used to investigate the most effective parameters. The Response Surface Method was then implemented to construct the surrogate models and to recognize the best points over a design space created as based on the Box-Behnken methodology. The results highlighted the factors that affected impeller performance the most. Using the Design of Experiment technique, the model which optimized both efficiency and pressure ratio simultaneously delivered a design with 3% and 11% improvement in each respectively in comparison to the initial impeller at the design point. Importantly, this was not at the expense of sacrificing range, of critical concern in compressor design.

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Section: Introductionmentioning

confidence: 99%

Optimization of a Centrifugal Compressor Using the Design of Experiment Technique

Mojaddam

Pullen

2019

Applied Sciences

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“…The tandemblade impeller significantly improves the uniformity of the impeller discharge flow and has better aerodynamic performance with high efficiency, wide stable operating range as well as high reliability. [16][17][18][19] However, none of literature is available on its application in the centrifugal pump. In comparison with the conventional impeller design, the purpose of the tandem-blade design method is to improve the velocity and pressure distributions of the centrifugal pump and enhance the pump performance.…”

Section: Introductionmentioning

confidence: 99%

Investigations on the influence of tandem blades on inner flow and performance characteristics of centrifugal pump

Shi

Jiang

Zhao

2019

Proceedings of the Institution of Mechanical Engineers, Part E:

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Although significant advances have been made in tandem-blade technology for axial and centrifugal compressors, little attention has been paid to its application in centrifugal pumps. In this study, we propose a new tandem-blade design method for improving inner flow characteristics and overall performance of a centrifugal pump. With the SST k − ω turbulence model, three-dimensional turbulent flow fields in the centrifugal pump with tandem blades are simulated and analyzed. The effects of tandem blades on the inner flow and performance characteristics of the centrifugal pump are investigated. The predicted velocity and pressure distributions and flow behavior of the tandem-blade impeller are compared with those of a conventional single row blade impeller. It is indicated that the centrifugal tandem-blade impeller exhibits a significant advantage in terms of the uniformity of the impeller discharge flow. The tandem blades improve the jet-wake structure and uniformity of velocity and pressure distributions at the impeller outlet, and thus reduce the pressure fluctuation and hydraulic loss. Moreover, the hump phenomenon is eliminated or alleviated under low flow rate conditions, and the tandem-blade impeller has better hydraulic performance within a wider operating range as well as high reliability. This study provides a basis for the further development of the centrifugal pump with tandem blades.

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“…In 2014, Ju and Zhang 5 computationally studied a tandem impeller, compared the baseline tandem impeller and splitter impeller, and concentrated on the tandem impeller optimization. The results showed that the baseline tandem impeller had a more uniform flow field but a lower efficiency than the splitter impeller, and encouragingly, the tandem impeller efficiency can be increased by appropriate optimization.…”

Section: Introductionmentioning

confidence: 99%

The performance of a centrifugal compressor with a tandem impeller in off-design conditions

Han

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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Centrifugal compressors often suffer relatively low efficiency and a terrible operating range particularly due to the complex flow structure and intense impeller/diffuser interaction. Numerous studies have focused on improving the centrifugal compressor performance using many innovative ideas, such as the tandem impeller, which has become increasingly attractive due to its ability to achieve the flow control with no additional air supply configurations and control costs in compressor. However, few studies that attempted to the investigation of tandem impeller have been published until now and the results are always contradictory. To explore the potential of the tandem impeller to enhance the compressor performance and the underlying mechanism of the flow phenomena in the tandem impellers, this paper numerically investigated a high-pressure-ratio centrifugal compressor with several tandem impellers at off-design operating speeds. The results encouragingly demonstrate that the tandem impeller can achieve a performance enhancement over a wide range of operating conditions. Approximately 1.8% maximum enhancement in isentropic efficiency and 5.0% maximum enhancement in operating range are achieved with the inducer/exducer circumferential displacement of [Formula: see text] = 25% and 50%, respectively. The observed stage performance gain of the tandem impellers decreases when the operating speed increases due to the increased inducer shock, increased wake losses, and deteriorated tandem impeller discharge flow uniformity. In addition, the tandem impeller can extend the impeller operating range particularly at low rotation speeds, which is found to be a result from the suppression of the low-momentum fluid radial movement. The results also indicate that the maximum flux capacity of the tandem impeller decreases due to the restriction of the inducer airfoil Kutta–Joukowsky condition.

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Design Optimization and Experimental Study of Tandem Impeller for Centrifugal Compressor

Cited by 21 publications

References 17 publications

Optimization of a Centrifugal Compressor Using the Design of Experiment Technique

Optimization of a Centrifugal Compressor Using the Design of Experiment Technique

Investigations on the influence of tandem blades on inner flow and performance characteristics of centrifugal pump

The performance of a centrifugal compressor with a tandem impeller in off-design conditions

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