Study of Cross-Flow-Fan Internal Flow by Flow Visualization. (Discussion of Measured Results by Particle-Tracking Velocimetry).

Tsurusaki, Hiromu; Shimizu, Hirofumi; Tsujimoto, Yoshinobu; Yoshida, Yoshiki; Kitagawa, Koichi

doi:10.1299/jsmeb.39.540

Cited by 10 publications

(2 citation statements)

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“…They showed that the ratio of the volute throat width to the arc length of the impeller is an important parameter that affects the performance of the cross-flow fan [5]. Hiromu and Tsurusaki [6] and Yoshinobu and Tsujimoto [7] used particle image velocimetry (PIV) measurements to investigate the flow field of the cross-flow fan and analyzed the influence of the flow coefficient of the cross-flow fan on the internal velocity field and the eccentric vortex. Yang and Zhong [8] utilized experimental methods to analyze different structural dimensions, including the impeller diameter and internal flow field variations of the cross-flow fan.…”

Section: Of 19mentioning

confidence: 99%

Investigating the In-Flow Characteristics of Multi-Operation Conditions of Cross-Flow Fan in Air Conditioning Systems

Zhang

Yuan

et al. 2019

Processes

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Cross-flow fans are widely used in numerous applications such as low-pressure ventilation, household appliances, laser instruments, and air-conditioning equipment. Cross-flow fans have superior characteristics, including simple structure, small size, stable airflow, high dynamic pressure coefficient, and low noise. In the present study, numerical simulation and experimental research were carried out to study the unique secondary flow and eccentric vortex flow characteristics of the internal flow field in multi-operating conditions. To this end the vorticity and the circumferential pressure distribution in the air duct are obtained based on the performed experiments and the correlation between spectral characteristics of multiple operating conditions and the inflow state is established. The obtained results show that when the area of the airflow passage decreases while the area of the eccentric vortex area gradually increases, then the airflow of the cross-flow fan decreases, the outlet expands, and the flow pattern uniformity reduces. It was found that wakes form in the vicinity of the blade and the tail of the volute tongue, which generate pressure pulsation, and aerodynamic noise. The pressure distribution along the inner circumference shows that the total minimum pressure appears in the eccentric vortex near the volute tongue and the volute returns near the zone. Moreover, it was found that the total pressure near the eccentric vortex is significantly smaller than that of the main flow zone. As the flow rate decreases, the pressure pulsation amplitude of the eccentric vortex region significantly increases, while the static and total pressure pulsation amplitudes are gradually increased. Close to the eccentric vortex on the inner side of the blade in the volute tongue area, total pressure is low, total pressure on the outside of the blade is not affected, and pressure difference between the inner and outer sides is large. When the flow rate of the cross-flow fan is 0.4 Qd, there is no obvious peak at the harmonic frequency of the blade passage frequency. This shows that the aerodynamic noise is caused by the main unstable flow.

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Section: Of 19mentioning

confidence: 99%

Investigating the In-Flow Characteristics of Multi-Operation Conditions of Cross-Flow Fan in Air Conditioning Systems

Zhang

Yuan

et al. 2019

Processes

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“…Results also showed that the blades in discharge region had good aerodynamic performance than in suction region. Tsurusaki et al [7] conducted experiments for measuring the internal flow velocities by particle-tracking velocimetry (PTV). The center of the eccentric vortex moved towards the casing and area of recirculation increased as flow rate was decreased.…”

Section: Introductionmentioning

confidence: 99%

Effect of impeller geometry and tongue shape on the flow field of cross flow fans

Govardhan

Venkateswarlu

2003

J. of Therm. Sci.

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Experiments were conducted to investigate the effect of impeller geometry and tongue shape on the flow field of cross flow fans. Three impellers (I, II, III) having same outer diameter, but different radius ratio and blade angles were employed for the investigation. Each impeller was tested with two tongue shapes. Flow survey was carried out for each impeller and tongue shape at two flow coefficients, and for each flow coefficient at different circumferential positions. The flow is two-dimensional along the blade span except near the shrouds. The total pressure developed by the impellers in each case is found to be maximum at a circumferential position of around 270 ° . The total and static pressures at the inlet of impellers are more or less same regardless of impeller and tongue geometry, but they vary considerably at exit of the impellers. Impeller III with tongue T2 develops higher total pressure and efficiency where as impeller II with tongue T2 develops minimum total pressure. Higher diffusion and smaller vortex size are the reasons for better performance of impeller III with tongue T2.

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Fracture Mechanics of Functionally Graded Materials

Jin

2003

Advances in Mechanics and Mathematics

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Study of Cross-Flow-Fan Internal Flow by Flow Visualization. (Discussion of Measured Results by Particle-Tracking Velocimetry).

Cited by 10 publications

References 1 publication

Investigating the In-Flow Characteristics of Multi-Operation Conditions of Cross-Flow Fan in Air Conditioning Systems

Investigating the In-Flow Characteristics of Multi-Operation Conditions of Cross-Flow Fan in Air Conditioning Systems

Effect of impeller geometry and tongue shape on the flow field of cross flow fans

Fracture Mechanics of Functionally Graded Materials

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