THE COMPARISON OF IMPACT OF THE AIRFLOWS OF AN AXIAL FAN’S SUCTION AND BLOWING SECTIONS ON HUMAN SENSATION

As two common kinds of air supply modes, natural wind and mechanical wind have obvious differenceson human sensation. From former researches, it can be seen that the 1/f fluctuation property of thespectrum of natural wind is an important factor to cause people feel more comfortable. While, thespectrum of mechanical wind often deviates from 1/f fluctuation because of its relatively morehigh-frequency fluctuating energy, which also brings some difficulties for imitating natural wind.This paper compares the airflow of the suction section with that of the blowing section of an axial fan.The result shows that high-frequency fluctuating energy of the suction sections airflow is lower thanthat of the blowing sections, consequently the spectrum of the suction sections airflow is relativelymore close to 1/f fluctuation. By using these two airflows to blow the subjects arms, the subjectssensation vote was conducted. Majority of the subjects reflected that the blowing sections airflow washarder and with more violent stimulus than the suction sections, and the suction sections airflow wasmore acceptable to the subjects.The experiment finds a simple way to decrease high-frequency fluctuating energy of mechanical airflow,which will be helpful for imitating natural wind better.