Abstract
The influence of low-pressure environment on centrifugal fan’s flow and noise characteristics was studied experimentally and numerically. A testbed was established to conduct the experimental test on the performance of a centrifugal fan, and the characteristic curve and power consumption curve of the fan under different pressure were obtained. Then the simulation model of the centrifugal fan was established, which was used to simulate the working process of centrifugal fan under different negative pressures. The results showed that the total pressure and static pressure of the fan decrease with the decrease of the ambient pressure. The total and static pressures of the fan under 60 kPa pressure condition decreased by 42.3% and 38.3%, respectively, compared with those of fan under the normal pressure. The main reason for this phenomenon is that the decrease of the environmental pressure leads to the decrease of air density. Besides, with the drop of environmental pressure, the sound pressure and sound power of the fan noise decreases.
Highlights
Under the plateau environment, the air is thin and the air pressure is low, which changes the physical properties and flow characteristics of the air
The flow rate, static pressure, axial power, efficiency, rotational speed, noise, and other performance parameters of the fan are all related to the physical properties of the air, so the flow and noise characteristics of the fan will inevitably be affected by the change of environmental pressure
PtF = P2 − P1 + ρ where P1 and P2 are the static pressure at the inlet and outlet; uf1 and uf2 are the average flow rate at the inlet and outlet, and r is the rotating radius of the blade
Summary
The air is thin and the air pressure is low, which changes the physical properties and flow characteristics of the air. The flow rate, static pressure, axial power, efficiency, rotational speed, noise, and other performance parameters of the fan are all related to the physical properties of the air, so the flow and noise characteristics of the fan will inevitably be affected by the change of environmental pressure. The studies on the performance of fans under low pressure environment are still relatively few. The articles that studied the noise characteristics of the fan in the low-pressure environment were not retrieved. It is difficult to reveal the mechanism of low-pressure environment on the flow and noise characteristics of fans. 2. Analysis of the Influence of Low-Pressure Environment on Noise Characteristics of Centrifugal Fan
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