scholarly journals Fluid-solid coupling field analysis of centrifugal fan based on nonlinear dynamics

2017 ◽  
Vol 19 (7) ◽  
pp. 5473-5481
Author(s):  
Chenxu Luo ◽  
Shuangxi Jing ◽  
Xiaoming Han ◽  
Junfa Leng
Keyword(s):  
Nonlinear Dynamics ◽  
Field Analysis ◽  
Centrifugal Fan ◽  
Coupling Field

Temperature and coupling field analysis of ring resonator

2018 ◽  
Author(s):  
Guangfeng Lu ◽  
Xudong Yu ◽  
Xuezhi Dai ◽  
Gao Na
Keyword(s):  
Ring Resonator ◽  
Field Analysis ◽  
Coupling Field

Numerical Analysis of a Centrifugal Fan for a Road Sweeper

2017 ◽  
Author(s):  
Xiaoxuan Chen ◽  
Mingyang Yang ◽  
Kangyao Deng ◽  
Yunlong Bai
Keyword(s):  
Flow Field ◽  
Field Analysis ◽  
Centrifugal Fan ◽  
Suction Force ◽  
Flow Loss ◽  
Computational Fluid Dynamics Cfd ◽  
Flow Field Analysis ◽  
Cfd Method ◽  
Original Configuration ◽  
Inlet Duct

Road sweeper is the widely-employed machine to clear up garbage and dust on streets. Its performance has profound influence on the reduction of fuel consumption and hence CO2 emission. The key component of a road sweeper is a centrifugal fan which produces suction force for clearing. Therefore, the performance of this device has direct impact on fuel economy of the machine. This paper targets at the performance analysis of a centrifugal fan in a commercial road sweeper. Firstly, the performance and flow field of the centrifugal fan are analyzed by computational fluid dynamics (CFD) method. The breakdown of the flow loss in the fan shows that the volute and the impeller are major components contributing to flow loss in the fan. The flow at the inlet of the impeller is highly distorted due the interaction among the asymmetrical inlet duct, the leakage and the volute tongue. Because of the interaction, flow passages near the tongue are the ones with the highest flow loss. Moreover, the flow velocity entering the volute is considerably high which thus results in high flow loss in the volute. Finally, based on the flow field analysis, an inlet duct with round shape is designed preliminarily and simulated together with the centrifugal fan. The results show that the efficiency can be improved by more than 4% compared with the original configuration due to the alleviation of the interaction.

scholarly journals Flow and Noise Characteristics of Centrifugal Fan under Different Stall Conditions

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Lei Zhang ◽  
Shoufang Liang ◽  
Chenxing Hu
Keyword(s):  
Flow Field ◽  
Power Level ◽  
Aerodynamic Characteristics ◽  
Rotating Stall ◽  
Field Analysis ◽  
Aerodynamic Noise ◽  
Navier Stokes ◽  
Implicit Time ◽  
Centrifugal Fan ◽  
Noise Characteristics

An implicit, time-accurate 3D Reynolds-averaged Navier-Stokes (RANS) solver is used to simulate the rotating stall phenomenon in a centrifugal fan. The goal of the present work is to shed light on the flow field and particularly the aerodynamic noise at different stall conditions. Aerodynamic characteristics, frequency domain characteristics, and the contours of sound power level under two different stall conditions are discussed in this paper. The results show that, with the decrease of valve opening, the amplitude of full pressure and flow fluctuations tends to be larger and the stall frequency remains the same. The flow field analysis indicates that the area occupied by stall cells expands with the decrease of flow rate. The noise calculation based on the simulation underlines the role of vortex noise after the occurrence of rotating stall, showing that the high noise area rotates along with the stall cell in the circumferential direction.

Numerical analysis of a centrifugal fan for performance enhancement using boundary layer suction slots

2010 ◽  
Vol 224 (8) ◽  
pp. 1665-1678 ◽  
Author(s):  
K Vasudeva Karanth ◽  
N Yagnesh Sharma
Keyword(s):  
Boundary Layer ◽  
Static Pressure ◽  
Performance Enhancement ◽  
Radial Distance ◽  
Field Analysis ◽  
Pressure Recovery ◽  
Centrifugal Fan ◽  
Suction Surface ◽  
Impeller Blade ◽  
Boundary Layer Suction

Flow in centrifugal fans tends to be in a state of instability with flow separation zones on both the suction surface and the front shroud. The overall efficiency of the diffusion process in a centrifugal fan could be enhanced by judiciously introducing the boundary layer suction slots. With easy accessibility of computational fluid dynamics (CFD) as an analytical tool, an extensive numerical whole field analysis of the effect of boundary layer suction slots in discrete regions of suspected separation points is possible. This article attempts to explore the effect of boundary layer suction slots corresponding to various geometrical locations on the impeller as well as on the diffuser. The analysis shows that the suction slots located on the impeller blade near to its trailing edge appreciably improves the static pressure recovery across the fan. Slots provided at a radial distance of 30 per cent from the leading edge of the diffuser vane also significantly contribute to the static pressure recovery across the fan.

Sound–Structure Coupling Analysis of Multi-Flexible Plates Enclosure

2012 ◽  
Vol 479-481 ◽  
pp. 1329-1333
Author(s):  
Zhi Chen Li ◽  
Nan Chen ◽  
Lin Ning Gu
Keyword(s):  
Energy Transfer ◽  
Wave Energy ◽  
Noise Control ◽  
Research Work ◽  
Field Analysis ◽  
Flexible Plate ◽  
Coupling Field ◽  
Transfer Path ◽  
Acoustic Cavity ◽  
Sound Structure

The research on enclosure noise control is caused more and more attention. The key of noise control is to grasp physical essence about enclosure sound-structure coupling field. The research work has been carried out on a enclosure model of two simly supported flexible plate and four rigid plates. The research is focused on sound –structure coupling field analysis of the enclosure when applying primary forces on two flexible plate simutaneously. At the constraint condition of average acoustic potential energy(AAPE) formulars of enclosure sound–structure coupling field is derivated. The simulation show the follow conclusion: first, the wave energy transfer path is from primary force flexible plate to acoustic cavity, then to another flexible plate, and then feedback to acoustic cavity. Second, when structural natural frequences are the same as acoustic natural frequencies of the enclosure, the noise reach the maximum value. The third, when applying primary force on Plate a and on Plate b simutaneously, the wave energy transfer path and The relation of sound-structure coupling are more complex than only applying force on one plate.

Coupled Numerical Analysis of Flow-Temperature Field of Marine Generator

2013 ◽  
Vol 341-342 ◽  
pp. 1397-1402 ◽  
Author(s):  
Shou Guang Yao ◽  
Fei Liu ◽  
Dong Sheng
Keyword(s):  
Temperature Field ◽  
Numerical Analysis ◽  
Air Gap ◽  
Field Analysis ◽  
Analysis Method ◽  
Flow Temperature ◽  
Flow Passage ◽  
Coupling Field ◽  
Volume Method ◽  
Generator Stator

In the present paper, the coupling numerical analysis of 3D flow field and temperature field inside a marine generator was analyzed based on coupling field analysis method. The overall flow-temperature field models consist of the marine generator stator and rotor and flow passage and the air gap. Numerical analysis of flow-temperature field of marine generator were simulated by the finite volume method. The velocity and pressure distribution of fluid inside flow passage and the temperature field distribution of stator and rotor of marine generator were obtained. The present results showed that, the coupling field analysis method of overall flow-temperature field with air gap, stator and rotor can reflect the complexity of the air flow more clearly, and the value of flow and temperature field were more reliable. The results also contribute theoretical basis on optimization of ventilation struture of generator.

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