An experimental study of pulsatile airflow in the fan inlet of an air-cooling heat exchanger using power spectrum analysis

摘要

Natural wind has great effects on the performance of direct air-cooling condensers. In order to study the interaction between natural wind and wind from air-cooling fans, pulsatile velocity of airflow in the fan inlet of an air-cooling heat exchanger was measured with IFA300 hot-film anemometry and analyzed using power spectrum analysis. The results show that the power spectrum exponent is small closed to the fan and increased gradually with the increase of the distance from the fan. Correspondingly, the air velocity is large near the fan and decay to the environment condition with the increase of the distance from the fan.