Measurement of Performance and Analysis for a P.C. Cooling Fan

• Main Authors: Lin,Chien-Chang, 林建璋
• Other Authors: Yang,Yi-Lung
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/59602627821663902616

碩士 === 中華大學 === 機械與航太工程研究所 === 89 === The purpose of this study is using a duct flow to measure the performance of personal computers cooling fans . By using different rectilinear guided vanes of angle 0∘、30∘、45∘、60∘、72∘, to study the recovery of swirling pressure . The position of these guided vanes is placed downsstream of the fan by a distance of 5 , 15 , 25 cm . The test results show the performance of the fan does not significantly alter by the guide vane position . The maximum difference of 8 ﹪is obtained . This shows the wall friction effect is not strong to deteriorate the recovering of the pressure . The overall performance of the fans is compared with the results from factory and National Tsing-Hua University . There is widely difference among these three tests . Clearly , a standard procedure and treatment of small cooling fan is necessary to gain the overall feature of the design . The detail measurement of the fan outlet flow field is done by pitot-static tube and hot-wire . The different of these two instrument reading is about 20 ﹪, the flow angle measurement has a difference of 15 ﹪. From these two test methods all show a 24﹪of unrecovery pressure by the rectilinear vanes compared to the downstream pressure data . Four different designs of the fan is used to compare , their overall performance . Fan A is a free vortex design . Fan B is a high loading blade design . Fan C＆D are force vortex design but has a 6∘different turning on the blade . The deviation angle of fan C is the smallest one . But the overall performance fan D is the best one . For high loading fan B , the deviation angle is more than 60∘.