Numerical study on aerodynamic noise performances of axial spacing in a contra-rotating axial fan

Luan, Hengxuan; Weng, Liyuan; Luan, Yuanzhong; Zhang, Yongchao; Chen, Peng

doi:10.21595/jve.2016.17926

Cited by 6 publications

(2 citation statements)

References 21 publications

(21 reference statements)

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“…Figure 21 depicts the five recording positions surrounding the CRF, and respecting some criteria defined in the standards (GB/T2888-2008), according to Luan et al (2016). The point A is at a distance of 1 m from the exit of CRF, whereas the points B, C, D and E are placed at a distance of 1 m from the fan duct at angles of 30, 60, 90 and 120 deg, respectively.…”

Section: Noise Assessmentmentioning

confidence: 99%

Simulation of Rotor-Rotor Interaction and Noise of an Axial Counter-Rotating Fan

2023

JAFM

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The Counter-Rotating Fan (CRF) offers higher aerodynamic performance, in terms of pressure head and aerodynamic efficiency, compared to the single rotor fan, thus making it an attractive solution for equipment cooling and ventilation of mines and tunnels. Nevertheless, further investigations are required to understand the flow interactions between the front rotor (FR) and the rear rotor (RR), as these interactions are sources of noise emission. This numerical study used the Unsteady Reynolds Average Navier-Stokes (URANS) flow simulations and the Fast Fourier transformation (FFT) to analyse the rotor-rotor interactions and consequences on the aero-acoustic performance. The static pressure fluctuations were recorded at several locations and analysed by FFT to reveal the mechanisms of flow interactions and the effects of axial inter-distance between the two rotors. The inter-distance seems to influence the aerodynamic loading of RR more than that of FR and the total-to-static isentropic efficiency tends to drop. Over one chord distance, the noise level decreases but at the expense of isentropic efficiency. The balanced performance does not seem to improve for an inter-distance greater than 1.5 chords, considered the optimum distance in this study. Finally, a graphical correlation which can be used to estimate the Sound Pressure Level (SPL) is developed for this category of CRF.

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Section: Noise Assessmentmentioning

confidence: 99%

Simulation of Rotor-Rotor Interaction and Noise of an Axial Counter-Rotating Fan

2023

JAFM

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“…As the axial space increases, flow instability will weaken, but the unsteady characteristic of the fluid flow in both R1 and R2 tends to become consistent. (20)(21)(22)(23)(24) To solve the overload problem encountered in R2 under small-flow conditions, a common solution is to adopt different loads (e.g., by reducing the load) or raise the power margin for R2. (25)(26)(27)(28) Nevertheless, these measures usually reduce the overall performance for other flow conditions.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Variable-speed Control for Enhancing the Performance of a Mine Counter-rotating Fan System

Ai¹,

Qin²,

Wang³

et al. 2021

Sensors and Materials

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The mine counter-rotating fan (MCRF) is important in tunnel construction and is also widely used for ventilation in mining. The need to improve the performance of MCRF systems has been attracting the interest of researchers. An MCRF is composed of two vane rotors that rotate in opposite directions. We propose a novel adaptive variable-speed (AVS) control method to improve the performance of an MCRF system. The proposed method is based on the concept of adaptively controlling the speed of the second vane rotor according to changes in the working conditions of the whole fan system. To evaluate the performance of our proposed AVS control method, experiments were performed using various sensors to detect pressure and mass flow rates when using our newly designed MCRF system. Results show that, with the proposed AVS control method, the problem of the rotor output torque rising and falling markedly during large and small mass flows, respectively, is overcome. Furthermore, the problems of overload and a low blocking margin are solved. As a result, the overall pressure increase and performance of the whole fan system are improved.

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Variable‐speed method for improving the performance of a mine counter‐rotating fan

Qin

Lin

et al. 2020

Energy Science & Engineering

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Existing methods of improving the performance of mine counter‐rotating fans (MCRFs) through speed matching of the rotors have certain drawbacks. This study proposes a variable‐speed method for the two rotors of an MCRF to improve its performance, including the blocking margin, operational safety, high‐efficiency working range (HER), and stability margin. Experimental and numerical methods were used to study the pneumatic performance of the MCRF. The results show that the second rotor (R2) is the critical stage affecting the safety of the motor, HER, and blocking margin. A condition‐adaptive speed matching method was proposed for R2 to avoid overloading the second motor at low‐flow rates and to improve the blocking margin and HER. The first rotor (R1) is the critical stage determining the stability margin of the MCRF. Reducing n1 and increasing n2 at low‐flow rates helped extend the stability margin.

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Numerical study on aerodynamic noise performances of axial spacing in a contra-rotating axial fan

Cited by 6 publications

References 21 publications

Simulation of Rotor-Rotor Interaction and Noise of an Axial Counter-Rotating Fan

Simulation of Rotor-Rotor Interaction and Noise of an Axial Counter-Rotating Fan

Adaptive Variable-speed Control for Enhancing the Performance of a Mine Counter-rotating Fan System

Variable‐speed method for improving the performance of a mine counter‐rotating fan

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