Improving the operating range using a centrifugal compressor with a tandem impeller

Li, Ziliang; Han, Ge; Lu, Xingen; Huang, Enliang; Zhao, Shengfeng

doi:10.1016/j.ast.2019.105548

Cited by 20 publications

(13 citation statements)

References 17 publications

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“…It is also employed to optimize the blade design of compressors. 37 , 38 In this section, this method is applied in the analysis of unsteady flow in the impeller with various tip clearances. The blockage factor is defined as where A act is the total area of the cutting plane, ρW m is the meridional momentum, and ( ρW m ) edge is the edge momentum.…”

Section: Resultsmentioning

confidence: 99%

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Transient characteristics of internal flow fields of mixed-flow pump with different tip clearances under stall condition

Shi

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part A:

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This paper investigates the influence of different tip clearances on the transient characteristics of mixed-flow pump under stall condition. The instantaneous internal flow fields of mixed-flow pump with four tip clearances (0.2 mm, 0.5 mm, 0.8 mm and 1.1 mm) are explored by conducting unsteady time accurate simulations. Reynolds-averaged Navier-Stokes (RANS) equations are employed in the simulations and the results of computations are compared with experimental data. The results show that the pump head decreases by 22.1% and the pump efficiency drops by 13.9% at design flow condition when the impeller tip clearance increases from 0.2 mm to 1.1 mm. The swirling flow occurs in the inlet pipe of the mixed-flow pump with different tip clearances under stall condition, and the initial starting point of the swirling flow gets further away from the impeller inlet with increase in tip clearance because of increase in circumferential velocity and change in momentum of the tip leakage flow (TLF). The high turbulent eddy dissipation (TED) regions in the flow are attributed to the TLF, swirling flow, back flow and stall vortex, and their intensity are affected by the change in tip clearance. The oscillating trend of time domain distribution of TED enhances first and then decreases with increase in tip clearance and it exhibits a propagation feature under the effect of stall vortex, while most of the energy in the frequency domain remains concentrated in the low frequency part under stall condition.

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Section: Resultsmentioning

confidence: 99%

Section: Blockage Factor Distribution In Impeller For Different Tip Clearancesmentioning

confidence: 99%

Transient characteristics of internal flow fields of mixed-flow pump with different tip clearances under stall condition

Shi

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…The gas recycling process increases the mass flow rate at the compressor inlet to prevent any surge. This process, however, induces system oscillations [7], [11]. In order to mitigate gas recycling effects in compressor operation, there is the need for parameter estimation, which can easily be achieved using state observers [12].…”

Section: Introductionmentioning

confidence: 99%

“…The observer can compensate for plant deficiencies by computing appropriate observer gain matrices [14]. A full order observer can compensate for the problem of measurement delay; it can also provide a means of VSD control by estimating all state variables for the proper control of mass flow and the compressor efficiency [11], [15], [16].…”

Section: Introductionmentioning

confidence: 99%

Optimal design of full order state observer for active surge control in centrifugal compressors using genetic algorithm

et al. 2022

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This paper presents the design of a genetic algorithm (GA) based full order state observer for a compressor system. The observer measures the compressor system parameters and computes the difference between the measured output and the setpoint, which is used as feedback to the active surge controller. The proposed control structure with a GA tuned compressor characteristic is required to minimize system oscillations and energy losses induced by the piston actuation gas recycling technique. The design method for GA based full order observer begins with a state observer modelling, observer error estimation based on the magnitude of fluid friction and mechanical effects on measured parameters. The aim of the controller is to regulate the compressor driver speed such that the measured output achieves its required set point. In order to achieve a maximum compressor operating capacity, the compressor characteristics were optimized using GA, where the mass flow was maximized to improve the compressor efficiency. Simulations were carried out, and results showed the viability of GA based full order state observer compared with the piston actuation recycle method to control active surge in centrifugal compressor systems.

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“…The concept of tandem blading is not limited to the axial flow compressor. Li et al 11,12 investigated the application of tandem impeller blade in the centrifugal compressor. Other researchers [13][14][15][16][17][18][19] also performed the numerical and experimental evaluation of the tandem cascade.…”

Section: Introductionmentioning

confidence: 99%

Design methodology of a highly loaded tandem rotor and its performance analysis under clean and distorted inflows

Kumar

Pradeep

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Compact and efficient compressor design is one of the key challenges in aero-engine development. The flow through a compressor is exposed to adverse pressure gradients, which limits the maximum allowable flow turning in a compressor blade. Tandem blading is an interesting concept to achieve a higher total pressure rise by augmenting the flow turning angle. Variation in axial overlap and percentage pitch of the forward and aft blade elements largely influences the behavior of the tandem configuration. In the present study, the genetic algorithm is used to optimize the axial overlap and the percentage pitch for the tandem rotor. Results indicate that a lower axial overlap and higher percentage pitch results in optimum performance. The paper presents the parametric study of four tandem configurations with different axial overlaps and percentage pitches. A detailed experimental analysis of the four different tandem configurations is included in this paper. The behavior of the tandem rotor is examined under the clean and radially distorted inflow. Further, a comparison is drawn with a conventional single rotor in terms of aerodynamic parameters such as total pressure rise, axial velocity, and stall margin. The experimental analysis is supplemented by some interesting computational results, which are included to provide some insight into the complex flow field of the tandem rotor. Tandem rotor design is observed to have a higher sensitivity to radial tip inflow distortion. The upstream shift of the aft rotor blade adversely affects the total pressure rise and stall margin of the tandem rotor.

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Improving the operating range using a centrifugal compressor with a tandem impeller

Cited by 20 publications

References 17 publications

Transient characteristics of internal flow fields of mixed-flow pump with different tip clearances under stall condition

Transient characteristics of internal flow fields of mixed-flow pump with different tip clearances under stall condition

Optimal design of full order state observer for active surge control in centrifugal compressors using genetic algorithm

Design methodology of a highly loaded tandem rotor and its performance analysis under clean and distorted inflows

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