Fan Performance Characteristics of Centrifugal Fans

International Journal of Rotating Machinery, 2011

... Yu-Tai Lee, 1 Vineet Ahuja, 2 Ashvin Hosangadi, 2 Michael E. Slipper, 3 Lawrence P. Mulvihill, 1 Roger Birkbeck, 2 and ... of optimization process in total pressure and efficiency versus ShaftPWR (black solid circle indicates result obtained from 2D design, blue dash circle is from ...

Journal of Mechanical Engineering and Mechatronics, 2021

This paper presents the effects of the diverse serrated blade configurations on airflow characteristics of a modified centrifugal fan by CFD. This application is investigated to improve aerodynamic performance. These configurations (USB, ISB, USB, OSB) are simulated at the impeller speed levels by CFD. Then tested to analyze airflow characteristic values by ANCOVA test. The simulation results show that the BSB configuration achieves the high static pressures about 84.5-214.7 Pa in the wall zone. While the ISB generates the lower TKE in all the zones, except in the impeller zone. It produces about 0.51-12.47 m2s-2 TKE in the wall zone. The ANCOVA test results indicate that the effects of the impeller speed are very significant (a < 0.01) on the airflow characteristics in all the zones, except for static pressure is no significant (a > 0.05) in the impeller and fluid flow zone. The effect of the serrated blade configurations is very significant on static pressure in the inlet an...

2013

ERJSH, 2023

The use of slotted blades for centrifugal fan impellers improves fluid flow steadiness and reduces fan noise. The slots create a jet of fluid from the pressure side to the suction side that increases the momentum of the main flow and postpones t he flow separation. In addition, these slots make the fluid movement smoother and more efficient in impeller passages. In previous research, the optimum slot location was determined at 40% from the leading edge (at diameter Ds=0.65 DImpeller) with a 2.5 mm width. The present research concentrates on determining the optimum slot jet angle of a ten-blade backward curved centrifugal fan at the best efficiency point (BEP). Six values of slot inclination angles, namely θS1, θS2, θS3, θS4, θS5 and θS6, ranging from an inward slot direction of (+60°) to an outward direction of (-80°), are simulated numerically using an unsteady Computational Fluid Dynamics (CFD) model. The CFD results have proven the benefits of the outward slots that ranged from (θS=-60° to-80°) on stall control of the fluid on the blade suction side compared with the inward slots. At the BEP, the computed performance of the tested fan with an outward slot inclination angle θS6 =-80° showed a 2.6 percent efficiency improvement compared to fans with an inward slot of θS1=+60°. Generally, the outward slot direction has a positive effect on the boundary layer attachment on the suction side of the blade.

Volume 4: Ceramics; Concentrating Solar Power Plants; Controls, Diagnostics and Instrumentation; Education; Electric Power; Fans and Blowers, 2013

Large centrifugal fans in cement factories operate in an aggressive environment, as the cement particles dispersed in the flow are responsible for strong blade surface erosion that leads to performance degradation. This paper reports on the simulation of the flow field in a large centrifugal fan designed for process industry applications. The aerodynamic investigation, at a preliminary level, highlights the critical regions inside the device and suggests possible modification to increase its duty life. This paper reports on the simulation of the flow field in a large centrifugal fan designed for process industry applications. The aerodynamic investigation, at a preliminary level, serves the aim of highlighting the critical regions inside the device and suggest possible modification to increase its duty life.

A numerical study is carried out to investigate the effect of the addition of winglet to the end of blade on the axial fan performance. Validation and assessment of the used computer program FLUENT 6.2, is carried out by comparing its result with previous researcher. Simulation is then carried out to analyze the flow pattern with and without a winglet attached to the fan blade. Velocity distribution produced numerically showed that the winglet suppresses the secondary flow at the tip gap. Pressure distributions also confirmed the winglet advantages. Calculated performance of the fan used showed general increase of the fan efficiency with 3.5% above those without winglet at the optimum efficiency point and with up to 6 % at off design point.. 1. INTRODUCTION Fans demand minimum gaps in order to facilitate operation, this gap tip clearance flow is known to have detrimental effects on the axial fans performance. The static pressure difference between the suction and the pressure side o...

Impeller is a very important element in rotating devices to deliver energy to/from the fluid. The diffusers are essential for effective transformation of the kinetic power produced by the rotor in a centrifugal fan. Hence the flow in the impeller and diffuser passages is the important phenomenon in optimizing the performance. These impeller and diffuser flow passages are the most complex regions to predict the flow behavior. With the advanced development of Particle Image Velocimetry as well as convenient numerical CFD tools, it has become possible to reach at an accurate result well-matched with the real behavior of the flow. Hence, in this work moving mesh technique is used to get a numerical solution for the estimation of actual flow manner. Numerous research works have been done recently to get the physics of fluid flow through impeller and diffuser, both numerically and experimentally. But it is found from the literature that the study on the performance of the fan by changing the number of impeller and diffuser blades together in a combination has not been the emphasis of attention in these works. Hence a numerical analysis has been carried out in this paper to comprehensively lookout the fluid interaction in impeller-diffuser as well as to envisage the flow behavior of the fan by changing the number of impeller and diffuser blades together in combination. For the same number of impeller blades, it is found from the analysis that a higher static pressure rise coefficient is achieved at the outlet of the fan for smaller number of diffuser blades. It is also found that larger the number of impeller blades, larger is the static pressure rise coefficient for the same number of diffuser blades, hence performance gets improved.

Iconic Research and Engineering Journals, 2019

In this paper, single-stage centrifugal fan is observed by numerical study on the flow characteristic. The objective of this paper is to study the flow characteristics in the centrifugal fan under variable inlet parameters by numerical analysis. Numerical study also focuses on the flow velocity, temperature and pressure distributions around the fan due to the effect of inlet radial tipped impeller by applying CFD software ANSYS CFX-15.0. The model of radial tipped centrifugal fan is created by Solid Works software. The flow simulation has been carried out the Reynolds Averaged Navier-Stokes equation for incompressible flow is solved with standard eddy-viscosity k-epsilon turbulence model to study the properties of the fan.

2018

European regulations set standards for energy-efficiency of fans, with increasing requirements in the near future. Many studies concerning centrifugal fans have investigated the impeller but to only a smaller extends the spiral casing, which may take up a substantial part of the fan's hydraulic loss. Hence, appropriate design of the fan volute has significant meaning to centrifugal fan performance. An automized loop with RANS and data post-processing is set up for allowing a large number of parameter variations. The effect of volute angle, volute width and geometrical parameters related to the tongue and axial position of rotor, on total pressure loss and static pressure recovery coefficient are presented.