Design for a Squirrel Cage Fan with Double Arc Blade

Li, Z.; Dou, Hua-Shu; Lin, Paul; Wei, Yikun; Chen, Y.; Lin, Li‐Min; Ye, X.; Co., Ltd. Zhejiang Yilida Ventilator

doi:10.29252/jafm.13.03.30551

Cited by 10 publications

(7 citation statements)

References 11 publications

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“…The photograph of the testing site and a schematic diagram are presented in Figur 2. The static pressure of the fan is determined by measuring the pressure differential be tween the positive and negative pressure chambers using a pressure sensor, while the flow rate is calculated based on nozzle parameters [18,19]. The muffler section of each air cham ber is equipped with four pressure measurement points.…”

Section: Fan Test Methodsmentioning

confidence: 99%

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Effect of Motor Installation Heights on the Performance of an Isolated Centrifugal Fan

Luo²,

Zhu

et al. 2023

Processes

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For this paper, an investigation into the differences in the aerodynamic performance of fans caused by installation heights was conducted using computational fluid simulation. The predictions presented in this paper are in great agreement with the experimental data. The results show that a vortex is observable on the side of the motor, as it first accelerates and then obviously decelerates while passing through the impeller inlet to the front of the blade passage. Higher motor installation heights result in a decrease in static pressure and static pressure efficiency at higher flow rates. At the maximum flow rate, the static pressure efficiency of the fan at a lower installation height increased by 10% with the original fan, and the static pressure coefficient increased by 23% as well. The results reported in this paper demonstrate that installation heights greatly affect the aerodynamic performance of an isolated centrifugal fan under higher flow rate conditions and that the range of fan operation is extended at reasonable heights.

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Section: Fan Test Methodsmentioning

confidence: 99%

“…The pressure is determined as the average of four monitoring holes strategically positioned on the circumferential section of the chamber at a specific distance ahead and behind the nozzles. The flow rate Q m is calculated by the ∆P st in front of and behind the nozzles [18,20].…”

Section: Fan Test Methodsmentioning

confidence: 99%

Effect of Motor Installation Heights on the Performance of an Isolated Centrifugal Fan

Luo²,

Zhu

et al. 2023

Processes

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“…χ 1 and χ 2 in Table 5 are used as a set of variables, and stress is used as a variable y, which is substituted into formula (7), it can be obtained that the multiple correlation coefficient between the stress of weld 1 and the position of side column 1 and side column 2 is 0.89. Similarly, according to the data of Table 6, the multiple correlation coefficient of the stress of weld 2 and the position of side column 1 and side column 2 is 0.66.…”

Section: Correlation Analysis Based On Multiple Correlation Coefficientmentioning

confidence: 99%

“…(a) The crack on cross bearer weld of 70t gondola car body, (b) The crack on cross bearer weld of 80t gondola car body At present, scholars have mainly studied the structural asymmetry in the fields of towers, bridges, composite materials, etc. [2][3][4][5], and there are only a few scholars who have researched on the structural asymmetry of ships, buses, and other mechanical structures [6][7][8]. The methods used in these studies can be mainly summarized as follows: finite element simulation is used to analyze and evaluate the influence of asymmetric structure on the stress, stiffness, frequency, etc.…”

Section: Introductionmentioning

confidence: 99%

Correlation Research Between Gondola Car Body Structure And Weld Stress Based On Asymmetry Coefficient

Liu

Zhang

et al. 2021

Preprint

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In order to find out the root cause of cross bearer welds’ cracks on the general purpose gondola cars, the relationship between asymmetric structure and stress distribution is studied in this paper. Firstly, the concept of asymmetry coefficient is proposed, and the asymmetric coefficients’ calculation methods of independent and dependent variables are given respectively in two-dimensional space. Secondly, according to the different positions of side column 1 and side column 2, 30 local models are established, the cross bearer weld stresses are extracted after finite element simulation, and the stress distribution clusters are formed. Finally, the asymmetry coefficients of the side columns are calculated, and the correlation between the positions of the side columns and the weld stresses is studied by the methods of Pearson correlation coefficient and complex correlation coefficient. The results show that the correlation between the stress of cross bearer weld 2 and the positions of the side columns is much higher. This research can not only provide an important basis for the structural optimization of 80t gondola car body, and it also provides reference for the structural design of the gondola car body.

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“…An interesting finding revealed that the dominant patterns of jet-wake flow were caused by vortex and blade channel blockage, resulting in high velocities on the pressure side of the blade [13]. The orthogonal method has also been employed to improve the number of blades, manufacturing parameters of fan blades, and aerodynamic performance of fans [14,15]. Xu et al [16] investigated the impact of different blade tilt angles on the performance of centrifugal compressors.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Aerodynamic Performance of a Centrifugal Compressor with Leaned and Bowed 3D Blades

Li,

Kong,

Shao

et al. 2024

Processes

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The application of centrifugal compressors is extensive in industries such as aerospace and energy. The blade is the primary factor affecting the aerodynamic performance of compressors. In this paper, the aerodynamic performance of a centrifugal compressor with leaned and bowed 3D blades is investigated. The spanwise section profiles of the blade in the circumferential direction are deflected at different angles, resulting in four compressors with distinct leaned and bowed 3D blades based on the original model. There is a significant change in isentropic efficiency of the modified models under design conditions. Specifically, models 1, 3, and 4 experienced an increase of 0.97%, 1.04%, and 0.79%, respectively, while model 2 experienced a decrease of 0.70%. The profile of the blade tip and 50% spanwise section are shifted towards the suction surface, resulting in a geometric structure where the blade is concave towards the pressure surface. This structure gradually lifts the flow from the blade root to the blade tip downstream to the outlet area of the flow channel, reducing the load on the trailing edge of the blade and making the flow more closely aligned with the blade. At the same time, the larger radial velocity gradient near the blade tip suppresses the backflow on the shroud side, making the flow at the impeller outlet more stable. The outlet velocity of the impeller is more evenly distributed along the spanwise and circumferential directions, which improves the flow at the inlet of the diffuser and enhances the efficiency of the diffuser. Due to the high spanwise height of the leading edge of the blade, this bowed blade structure has little effect on the spanwise curvature upstream of the blade, resulting in negligible influence on the flow of the upstream channel.

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Design for a Squirrel Cage Fan with Double Arc Blade

Cited by 10 publications

References 11 publications

Effect of Motor Installation Heights on the Performance of an Isolated Centrifugal Fan

Effect of Motor Installation Heights on the Performance of an Isolated Centrifugal Fan

Correlation Research Between Gondola Car Body Structure And Weld Stress Based On Asymmetry Coefficient

Investigation on Aerodynamic Performance of a Centrifugal Compressor with Leaned and Bowed 3D Blades

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