Study on Numerical Simulation of Internal Flow Field for the Multi Blade Centrifugal Fan

Zhang, Sheng Li; Li, Hua Xing

doi:10.4028/www.scientific.net/amm.525.251

Cited by 3 publications

(3 citation statements)

References 8 publications

(7 reference statements)

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“…Velocity inlet was used as the inlet boundary condition, and the user define function (UDF) was used to edit the inlet flow rate fluctuation function. 21 The flow rate fluctuation curve is shown in Figure 5. The outflow was used as the outlet boundary condition.…”

Section: Calculation Methods and Boundary Conditionsmentioning

confidence: 99%

Analysis of the flow field characteristics of a centrifugal blood pump in a heartbeat cycle

Zhang,

Yang,

Shao

2024

Advances in Mechanical Engineering

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Blood pumps are medical devices that can temporarily or permanently replace the heart to perform the job of blood pumping. To study the internal flow field characteristics of the centrifugal blood pump, high-speed photography (HSP) images of the internal flow in the centrifugal blood pump were taken, and the internal flow field was numerically simulated. According to the heartbeat rule, the visualization experiment method and numerical simulation method for the internal flow of the centrifugal blood pump were developed. The internal flow rule of the centrifugal blood pump during a heartbeat cycle was revealed, as well as the influence of pump construction, flow rate, and other factors on the pump’s flow field. The results indicate that the flow rate and the rotor/stator interference of the blade and volute tongue cause two periodic changes in the pump pressure and velocity. One is the cycle of the heartbeat, and the other is the cycle of the blade’s rotation. The research results are of great significance in reducing the mechanical damage of blood, optimizing the structure of the pump and improving the stability of the centrifugal blood pump.

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Section: Calculation Methods and Boundary Conditionsmentioning

confidence: 99%

Analysis of the flow field characteristics of a centrifugal blood pump in a heartbeat cycle

Zhang,

Yang,

Shao

2024

Advances in Mechanical Engineering

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“…Previous studies have also investigated the internal flow of multiblade centrifugal fans. Maeda et al 21 and Jiang et al 22,23 examined the internal flow structure of multiblade centrifugal fans, exploring flow separation, secondary flow, inlet vortex, and other phenomena using experiments and numerical simulations. The study of the volute tongue is also crucial since it is the location where complex flow occurs in the multiblade centrifugal fan.…”

Section: Introductionmentioning

confidence: 99%

Cause analysis and suppression method of the vortex at the impeller outlet of the multiblade centrifugal fan

Lei

Jia

Cui

et al. 2023

Energy Science & Engineering

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Indoor air conditioning systems play a crucial role in regulating the environmental conditions of enclosed spaces. The noise generated by such systems can significantly impact human comfort. The multiblade centrifugal fan, as a crucial component of indoor air conditioners, has a significant impact on the performance of the air conditioner. The vortex, which is the primary noise source inside the fan, hinders the aerodynamic noise reduction of the indoor unit. During experimental research and numerical simulation of the indoor unit, the researchers identified the presence of a vortex flow at the outlet of the multiblade centrifugal fan. By analyzing the velocity vector of different cross‐sections in the fan, the researchers determined the formation mechanism and influencing factors of the vortex at the fan's outlet. The addition of fairing sheet plates on the volute wall was explored as a vortex suppression method, which proved effective in weakening and suppressing the vortex. The test results showed that under the same air volume, the noise reduction amplitude of the fan equipped with fairing sheet blades was 1.2 dB at an outlet static pressure of 30 Pa and 0.7 dB at an outlet static pressure of 100 Pa. The research findings suggest that the addition of the fairing sheet can effectively reduce the vortex's intensity, improve the performance of the multiblade centrifugal fan, and reduce the noise.

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“…6 compared the results of numerical stall simulations with experimental data at two different fan speeds, and the results showed that the stall characteristics were well matched to the experimental values. Zhang and Hua 7 simulated the internal flow field of a multiblade centrifugal fan using the computational fluid dynamics software Fluent based on the RANS equations. Kryłłowicz et al.…”

Section: Introductionmentioning

confidence: 99%

Simulation of air jets for controlling stall in a centrifugal fan

Zhang

Wang

Yuan

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part C:

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The main goal of the present work is to analyze the three-dimensional unsteady flow field of a centrifugal fan by solving Navier–Stokes equations, coupled with the throttle condition. The results show that rotating stall occurs in the original fan when the flow rate is 4.30 m3/s, and the stall inception first appears at three impeller passages near the volute tongue and front disc. An active control method is proposed to inhibit the stall inception, which involves blowing air at the inlets of the three impeller passages. This blowing control method cannot inhibit the stall inception when the blowing speed is lower than 50 m/s. The stability margin of the centrifugal fan is extended when the blowing speed is increased from 50 to 110 m/s, while no further effect is obvious with a further increase in the blowing speed. At a blowing speed of 110 m/s, rotating stall occurs again when the fan flow reaches 3.46 m3/s. After the application of the nozzle blowing, the safety margin of the centrifugal fan is extended by 13%, and an obvious stability enhancement effect is achieved. From an engineering standpoint, this new active control method for rotating stall offers a valuable means to ensure the safe operation of a centrifugal fan.

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Study on Numerical Simulation of Internal Flow Field for the Multi Blade Centrifugal Fan

Cited by 3 publications

References 8 publications

Analysis of the flow field characteristics of a centrifugal blood pump in a heartbeat cycle

Analysis of the flow field characteristics of a centrifugal blood pump in a heartbeat cycle

Cause analysis and suppression method of the vortex at the impeller outlet of the multiblade centrifugal fan

Simulation of air jets for controlling stall in a centrifugal fan

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