Abstract
This work presents an experimental study to investigate the influence of step volute tongue on aerodynamic performance and aeroacoustic behavior of a forward-curved fan. The noise characteristics are analyzed and controlled based on measured acoustic pressures for various stepped tongues; meanwhile, fan performance is detected and optimized. The design parameters of the stepped tongues are presented to provide significant physical insight into increasing the static pressure as well as the efficiency of static pressure and reducing the fan noise generation. The comparison of the test results indicates that the improved static pressure and its efficiency of the HLHL model have increased by 15.67 Pa and 3.57%, respectively, by comparing with those of the baseline model. At 740 m3/h, a great correlation between different arrays of stepped tongue and the noise generation was observed. The tonal noise level of the HLHL model is a better optimization scheme because it decreases as much as 1.2 dB for the noise generation of forward-curved fan. In particular, it is found that some stepped tongues of the volute tongue achieved the goal of reducing noise generation and improving the performance of fan by experimental measurement at the same time.
Highlights
Forward-curved fans are used in the air supply of central air conditioning widely requiring relatively low noise and high flow rate.[1,2]
The impeller of the fan consists of 38 forward-curved blades, which is considered for both the baseline model and the geometrically modified models
The forwardcurved fan is driven by an electrical motor at a speed of 1000 r/min
Summary
Forward-curved fans are used in the air supply of central air conditioning widely requiring relatively low noise and high flow rate.[1,2] In general, the main concern is the noise and performance of the forward-curved fan. Reducing the noise of fan is a great potential and a great challenge.[3] The generation of noise of the fan mainly includes three mechanisms: noise is generated aerodynamically which comprises impact noise and turbulent noise; the blade is moving periodically when the wheel is rotating at a high speed and gives a periodic force, which affected the movement trajectory of gas particles; the noise is generated by pushing the pressure waves at the sound speed. The noise of fans is generated due to turbulence. An overview of the generation mechanisms of fan noise and the controlling methods is presented by Neise.[4]
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