Effect of Vaneless Diffuser Shape on Performance of Centrifugal Compressor

Zhang, Qian; Huo, Qiuhong; Zhang, Lei; Song, Lei; Yang, Jiawei

doi:10.3390/app10061936

Cited by 4 publications

(2 citation statements)

References 23 publications

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“…Computational Fluid Dynamics (CFD) simulations [12][13][14] have been widely used in studies examining the performance of turbo blowers with different diffuser designs (vaned and vaneless). These simulations provide valuable information about the uid ow behavior, e ciency, and other essential aspects of these devices.…”

Section: Literature Reviewmentioning

confidence: 99%

Effect of Vaned and Vaneless Diffuser on the Performance of Turbo Blowers

DEMIRCIOGLU,

BOGREKCI,

SERT

et al. 2024

Preprint

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The choice of diffuser type in centrifugal compressors and turbo blowers impacts efficiency. Vaned diffusers perform best at high flow rates but lose efficiency at lower flows due to their fixed design. Vaneless diffusers, without fixed blades, adapt better to varying flow rates and excel at part-load conditions. Therefore, vaned diffusers are ideal for applications with constant high flow rates, while vaneless diffusers offer efficiency advantages in variable flow rate applications. HAUS Centrifugal technology's XMP 122 Turbo blower will be employed in performance tests with both vaned and vaneless diffusers. The blower features an automatic variable geometry diffuser (VGD) system that optimizes flow efficiency. During testing, the blower operated within a speed range of 19,000 to 33,000 rpm. Analysis of the obtained data revealed a noticeable enhancement in volume flow rate.

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Section: Literature Reviewmentioning

confidence: 99%

Effect of Vaned and Vaneless Diffuser on the Performance of Turbo Blowers

DEMIRCIOGLU,

BOGREKCI,

SERT

et al. 2024

Preprint

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“…Centrifugal compressors, as important general purpose equipment, are widely used in the aerospace, chemical, power and energy industries, but they are also highly energyconsuming machinery in industrial systems [1,2]. The devices that transport working fluids from the pipelines or the atmosphere to the impeller inlet are called inlet chambers, and radial inlet chambers are the key upstream component widely used in large-scale multistage centrifugal compressors due to the layout constraints of compact industrial systems [3,4].…”

Section: Introductionmentioning

confidence: 99%

Flow Control of Radial Inlet Chamber and Downstream Effects on a Centrifugal Compressor Stage

et al. 2021

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Radial inlet chambers are widely used in various multistage centrifugal compressors, although they induce extra flow loss and inlet distortions. In this paper, the detailed flow characteristics inside the radial inlet chamber of an industrial centrifugal compressor have been numerically investigated for flow control and performance improvement. First, the numerical results are validated against the experimental data, and flow conditions inside the inlet chambers with different structures are compared. They indicate that, in the non-guide vane scheme, sudden expansions, tangential flows and flow separations in the spiral and annular convergent channels are the major causes of flow loss and distortions, while using guide vanes could introduce additional flow impacts, separations and wakes. Based on the flow analysis, structure improvements have been carried out on the radial inlet chamber, and an average increase of 4.97% has been achieved in the inlet chamber efficiencies over different operating conditions. However, the results further reveal that the increases in the performance and overall flow uniformity just in the radial inlet chamber do not necessarily mean a performance improvement in the downstream components, and the distribution of the positive tangential velocity at the impeller inlet might be a more essential factor for the efficiency of the whole compressor.

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Spatiotemporal characteristics of flow in the bend and return channel perturbed by rotor–stator interaction

Zhang,

Gu,

Zhang

et al. 2024

Physics of Fluids

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The flows in turbomachinery systems are strongly perturbed by the rotor–stator interaction (RSI) between the rotating and stationary through-flow components, generating the fluctuating flows. This work presents a numerical investigation of a flow in a test centrifugal pump system consisting of an impeller, diffuser, bend, and return channel at the designed and low flow rates. Both vaneless and vaned diffuser models are considered to determine the perturbation of the diffuser vanes on the flow. The objective is to quantitatively assess the impacts of two influential factors, i.e., the diffuser type and the flow rate, on the spatiotemporal characteristics of the transient flow in the various through-flow components. Particular attention is paid to the generation of the reversed flow, circulating vortices, and temporal fluctuations of the velocity field. It is found from the numerical data that both the flow rate and the diffuser type affect the temporal fluctuations of the flow, primarily via the impact of the RSI-induced large-scale vortices generated in the passages of the impeller and the vaned diffuser. The flow in the bend experiences the streamline curvature on the solid walls; thus, the peak values of the fluctuating amplitude of the streamwise and transverse velocities and the reversed flow may shift between the two halves of the channel close to the inner and outer wall. The boundary layer flow patterns are mainly determined by the flow rate at the low flow rate and by the diffuser vanes at the designed flow rate. This work comprehensively reveals the transient behaviors and unsteadiness of the flow which was not provided in the experimental investigation for the test centrifugal pump system which was widely studied since the essential flow physics are included. The numerical data in the stationary bend and return channel are first provided, which are of engineering significance for this type of centrifugal turbomachinery.

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Effect of Vaneless Diffuser Shape on Performance of Centrifugal Compressor

Cited by 4 publications

References 23 publications

Effect of Vaned and Vaneless Diffuser on the Performance of Turbo Blowers

Effect of Vaned and Vaneless Diffuser on the Performance of Turbo Blowers

Flow Control of Radial Inlet Chamber and Downstream Effects on a Centrifugal Compressor Stage

Spatiotemporal characteristics of flow in the bend and return channel perturbed by rotor–stator interaction

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