| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2014: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2013: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2012: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2011: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2010: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
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| Outline of Final Research Achievements |
Blockage effects for bluff bodies were examined using a magnetic suspension and balance system which has no support interference. Cylinder models of fineness ratio 4 were tested of which the blockage ratio of the smallest model was 0.44%. From the obtained results, there is a linear relation between the ratio and the drag coefficient if the ratio is less than 3.14%. Although the models of less than the ratio of 1.97% were not tested in case of fineness ratio 2, the similar tendency was observed in the tested blockage ratio range as in case of the fineness ratio 4. Total blockage correction for the model is the sum of the corrections for a streamlined body and for a bluff body if the separated flow at the leading edge reattaches to the model surface.
In addition, three scale models on ground with a large lift coefficient were tested. Existing blockage effect evaluation methods could not estimate corrections correctly.
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