Investigations Into the Flow Behavior in a Nonparallel Shrouded Diffuser of a Centrifugal Fan for Augmented Performance

Madhwesh, N; Karanth, K. Vasudeva; Sharma, Neha

doi:10.1115/1.4039413

Cited by 9 publications

(4 citation statements)

References 18 publications

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“…In the cylindrical coordinate of reference, the well-benchmarked CFD algorithm for moving mesh zones is used to solve the conservation differential equations for continuity, momentum, and scalar transport [18,19]. The numerical analysis's boundary conditions closely match those in the author's relevant experimental data [16].…”

Section: Numerical Model Boundary Conditionsmentioning

confidence: 99%

Numerical Investigations and Artificial Neural Network-Based Performance Prediction of a Centrifugal Fan Having Innovative Hub Geometry Designs

Nagaraj,

Karanth

2023

ASI

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It is a well-known fact that air approaches the eye region of the rotating impeller of a centrifugal fan with shock-less entry conditions in an ideal scenario. The flow in this region is associated with induced swirl losses, leading to cumulative performance losses. Proper flow guidance in the vicinity of the eye region is essential to minimize possible flow losses. The flow guiding structure may be in the form of a projection or extrusion connected to the rotating impeller of the turbo machines and is generally named a hub. These attachments enhance the overall flow augmentation of the turbo machines in terms of static pressure improvement by reducing a significant amount of inlet turning losses. This article attempts to highlight the efficacy of hubs of various shapes and sizes on the pressure rise of the centrifugal fan using Computational Fluid Dynamics (CFD). Simulation results revealed that the optimized hub configuration yields about an 8.4% higher head coefficient and 8.6% higher relative theoretical efficiency than that obtained for the hub-less base configuration. This improvement in these paraments therefore also commemorates the global progress in energy efficiency as per the UN’s Sustainable Development Goals, SDG 7 in particular. Simultaneously, in the Artificial Neural Network (ANN), a Multi-Layer Perceptron (MLP) model is used to forecast the performance of a centrifugal fan with an optimized hub design. The results predicted by the ANN model are found to be in close agreement with the optimized hub shape’s numerical results.

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Section: Numerical Model Boundary Conditionsmentioning

confidence: 99%

Numerical Investigations and Artificial Neural Network-Based Performance Prediction of a Centrifugal Fan Having Innovative Hub Geometry Designs

Nagaraj,

Karanth

2023

ASI

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“…He also found that the deriving power of the compressor was decreased due to reduction in the impeller losses. Madhwesh et al [9] examined the effects of splitter vanes at various geometrical locations on the impeller blade. They found that the splitter vanes located near the leading edge improved the static pressure recovery of the fan.…”

Section: Introductionmentioning

confidence: 99%

Effects of Innovative Suction Slots on the Performance of a Radial Bladed Impeller of a Centrifugal Blower - A Numerical Transient Analysis

Madhwesh¹,

Karanth²

2021

Eng. Sci.

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The recirculation zones present in between the blade passages give rise to some losses in centrifugal blowers. The main objective of this study is to realign the flow at the suction side of the impeller by weakening the recirculation zones. This can be achieved by providing slots on the impeller blade geometry, which will efflux the flow from the pressure side of the impeller towards its suction side. Effects of single and multiple slots were analysed numerically for possible pressure recovery. The comparison of performance among various slot configurations is represented in terms of non-dimensional parameters. It is found from numerical study that a single slot provided at a radial distance of 75% from blade root and twin slots located at 50 % and 75% from the leading edge of the impeller vane significantly contribute to the static pressure recovery across the fan. Hence, it is beneficial to use multiple suction slots for better performance augmentation.

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“…However, diffuser vanes are very distorted and difficult to design, lacking mature theories and experiences. Meanwhile, it is a well-known fact that the diffuser of a centrifugal pump plays a vital role in the energy transformation leading to better pump head and efficiency [2]. Thus, it is significant and necessary to explore an optimal structural configuration of a space diffuser for an improved performance.…”

Section: Introductionmentioning

confidence: 99%

Effect of space diffuser on flow characteristics of a centrifugal pump by computational fluid dynamic analysis

Liu

Yang

et al. 2020

PLoS ONE

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Achieving an optimal configuration of the diffuser is indispensable for high pump performances. In this work, a numerical study on diffuser configuration is conducted for a high pump performance using a computational fluid dynamics code, and the effects of the wrap angle and the relative position of the diffuser vane to the impeller on pump performances are included. The results indicate that the modified diffuser with a suitable wrap angle may improve the pump hydraulic efficiency and the head by approximately 4% and 8%, respectively, while a suitable position of the diffuser vane can enhance the pump head by more than 4%. Meanwhile, the pressure recovery coefficient and the local Euler head of the diffuser are adopted to evaluate the diffuser performance. For a high pump performance, the local Euler head of the diffuser has a peak value at the leading edge with the change rate of zero along the meridian streamline, meaning that no blade loading at the leading edge of the diffuser guarantees a better match between the impeller and the diffuser.

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Investigations Into the Flow Behavior in a Nonparallel Shrouded Diffuser of a Centrifugal Fan for Augmented Performance

Cited by 9 publications

References 18 publications

Numerical Investigations and Artificial Neural Network-Based Performance Prediction of a Centrifugal Fan Having Innovative Hub Geometry Designs

Numerical Investigations and Artificial Neural Network-Based Performance Prediction of a Centrifugal Fan Having Innovative Hub Geometry Designs

Effects of Innovative Suction Slots on the Performance of a Radial Bladed Impeller of a Centrifugal Blower - A Numerical Transient Analysis

Effect of space diffuser on flow characteristics of a centrifugal pump by computational fluid dynamic analysis

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