J0601-2-1 CFDにファン性能曲線を取り込むための運用法の検討([J0601-2]電子情報機器,電子デバイスの強度・信頼性評価と熱制御(2))

概要

論文の詳細を見る
This paper describes how to use the fan performance curve for a CFD code. With the fan performance curve, a flow rate corresponded to a pressure difference between the forward and backward of the fan can be predicted. However, it was reported that the flow rate could not be predicted by the fan performance curve with high accuracy. In this study, the cause of the prediction errors due to using the fan performance curve was discussed. We compared the experimental flow rate and the evaluated flow rate by using the fan performance curve in CFD simulation. From the results, it is found that the prediction error is caused by the pressure drop which is observed when the air flows through the fan. Usually, the fan performance curve obtained from a standard fan performance measurement method includes pressure drop around the fan, e.g. contraction and expansion. However, the CFD codes would calculate the pressure field in the system including the pressure drop around the fan. Hence, the pressure drop caused by the contraction and expansion around the fan would be doubly-reflected and the predicted flow rate would be reduced in the CFD simulation. We found that this error can be corrected by using a revised P-Q curve. When the pressure drop at the fan inlet and outlet is added to the P-Q curve, we can predict the correct flow rate by using the revised P-Q curve.
2010-09-04