A review of prewhirl regulation by inlet guide vanes for compressor and pump

Liu, Ming; Tan, Lei; Cao, Shuai

doi:10.1177/0957650918820795

Cited by 15 publications

(9 citation statements)

References 54 publications

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“…Inlet guide vane installation is a common technique to control the fluid circulation and pressure ratio at the inlet of a turbomachine. This method was initially carried out in compressors and fans and was recently applied to centrifugal pumps to regulate fluid pre-swirl at the inlet [6]. Tan et al [7] studied the effect of an adjustable inlet guide vane for the pre-swirl regulation of a single-stage centrifugal pump and obtained a higher efficiency and head at the design point at an angle of 24 • .…”

Section: Introductionmentioning

confidence: 99%

Effect of an Inducer-Type Guide Vane on Hydraulic Losses at the Inter-Stage Flow Passage of a Multistage Centrifugal Pump

Shamsuddeen

Kim

et al. 2021

Processes

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A multistage centrifugal pump was developed for high head and high flow rate applications. A double-suction impeller and a twin-volute were installed at the first stage followed by an impeller, diffuser and return vanes for the next four stages. An initial design feasibility study was conducted using three-dimensional computational fluid dynamics tools to study the performance and the hydraulic losses associated with the design. Substantial losses in head and efficiency were observed at the interface between the first stage volute and the second stage impeller. An inducer-type guide vane (ITGV) was installed at this location to mitigate the losses by reducing the circumferential velocity of the fluid exiting the volute. The ITGV regulated the pre-swirl of the fluid entering the second stage impeller. The pump with and without ITGV is compared at the design flow rate. The pump with ITGV increased the stage head by 63.28% and stage efficiency by 47.17% at the second stage. As a result, the overall performance of the pump increased by 5.78% and 3.94% in head and efficiency, respectively, at the design point. The ITGV has a significant impact on decreasing losses at both design and off-design conditions. An in-depth flow dynamic analysis at the inducer-impeller interface is also presented.

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Section: Introductionmentioning

confidence: 99%

Effect of an Inducer-Type Guide Vane on Hydraulic Losses at the Inter-Stage Flow Passage of a Multistage Centrifugal Pump

Shamsuddeen

Kim

et al. 2021

Processes

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“…Variable inlet guide vanes (VIGVs) are widely used in axial-flow compressor and other fluid-machines [1][2][3] to provide the requested flow angle into downstream rotor to improve the compressor efficiency and stall margin at off-design conditions. 4,5 Research indicated that as the stagger angle increases the VIGV gradually comes into the high incidence operation conditions and the leading edge velocity spike induced flow separation arises leading to the rapid increase of losslevel, 6,7 which can cause considerable reduction of compressor efficiency.…”

Section: Introductionmentioning

confidence: 99%

Leading edge redesign of dual-peak type variable inlet guide vane and its effect on aerodynamic performance

Shi

2020

Proceedings of the Institution of Mechanical Engineers, Part G:

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Recently, a new type airfoil for variable inlet guide vane (VIGV), featuring “dual-peak” surface velocity pattern at high incidence, is proposed and shows wide low-loss operation range. To further improve its performance, this paper researches the influence of leading edge (LE) thickness and shape on the loss level and surface velocity features of the “dual-peak” type airfoil. Firstly, a polynomial-based continuous-curvature leading edge design method was briefly introduced and used in the LE redesign of sample airfoils. Then, steady simulations based on Reynolds-Averaged Navier-Stokes method (RANS), carried out by commercial software CFX after grid independent study, were used to determine the aerodynamic performance, surface velocity distribution and boundary-layer behaviors of all research airfoils. Simulation results indicate that there exists an optimized range of LE relative thickness that can achieve lower airfoil loss level at high incidence condition. For Case 1 ([Formula: see text]) and Case 2 ([Formula: see text]), the optimized LE relative thickness range is [Formula: see text] and [Formula: see text]. The LE shape optimization can further reduce the maximum incidence condition loss coefficient with proportion up to 18% for airfoils with optimal LE thickness. Analysis of flow mechanism indicates that the optimized LE thickness and shape can reduce the suction spike height and subsequent adverse pressure gradient, therefore, decrease the LE separation scale and result in a lower loss coefficient. As an application, a dual peak VIGV with circular LE, presented in previous paper as the optimized VIGV, is redesigned in the LE portion according to the research findings and achieved 0.6 percent improvement in passage-averaged total pressure recovery coefficient [Formula: see text] at extreme high stagger angle point and the low-loss operation range extends with about 5°, which confirms the effectiveness of the research findings in three-dimensional environment.

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“…The prewhirl regulation by IGVs is an effective means of improving the efficiency and operation stability of compressors and fans. Liu et al 16 reviewed the researches on the prewhirl regulation by IGVs for compressors and pumps and the influence of their geometry on the performance. Prewhirl has an obvious impact on pumps energy performance over ranges of flow rates, 17 and the amplitudes of pressure fluctuations seem to lessen at the blade leading edge 18 .…”

Section: Introductionmentioning

confidence: 99%

Characterization of flow interactions in an axial fan stage

Ghenaiet

2020

Engineering Reports

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The aim of this study is to characterize the steady and unsteady flows of a high-speed axial fan stage and assess its aerodynamic performance parameters. The flow unsteadiness is related to the stator-rotor interaction originated mainly by two mechanisms: the first is attributed to the potential effect and the second to the wake-blade interaction and the mixing through the blades' passages. Such effects are dependent on the circumferential positions of blades and inter-distance between stator and rotor, which could be alleviated by understanding these flow interactions. The pressure waves' main diametrical modes (two blades interacting with two vanes) and their sequences are predicted analytically. FFT analysis of the computed static pressure fluctuations at different monitor points allowed identifying the prevailing modes of interaction and their frequencies and sequence. The assessment of inter-distance is an important step toward identifying the detrimental effects of axial interdistance on the aerodynamic performance. The closer the blade-rows of this fan stage can be spaced, the more compact the cooling system of an automotive could be designed.

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A review of prewhirl regulation by inlet guide vanes for compressor and pump

Cited by 15 publications

References 54 publications

Effect of an Inducer-Type Guide Vane on Hydraulic Losses at the Inter-Stage Flow Passage of a Multistage Centrifugal Pump

Effect of an Inducer-Type Guide Vane on Hydraulic Losses at the Inter-Stage Flow Passage of a Multistage Centrifugal Pump

Leading edge redesign of dual-peak type variable inlet guide vane and its effect on aerodynamic performance

Characterization of flow interactions in an axial fan stage

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