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Çѱ¹¼öÀÚ¿øÇÐȸ / v.39, no.9, 2006³â, pp.727-735
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À¯»çÀÔÀÚ¿¡ ÀÇÇÑ °³¼ö·Î ³·ù À¯¼Ó ºÐÆ÷ÀÇ º¯È¿¡ ´ëÇÑ Àç°ËÅä
( Re-evaluation of Change of Mean Velocity Profile in Open-Channel Turbulent Flows due to Sediment Particles ) |
·ù±Ç±Ô;À±º´¸¸; µ¿ÀÇ´ëÇб³ Åä¸ñ°øÇаú;¸íÁö´ëÇб³ Åä¸ñ°øÇаú;
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Vanoni°¡ 1946³â¿¡ À¯»ç¸¦ Æ÷ÇÔÇÑ È帧¿¡¼´Â Karman»ó¼ö°¡ °¨¼ÒÇÑ´Ù°í Á¦¾ÈÇÑ ÀÌÈÄ·Î °³¼ö·Î È帧¿¡¼ À¯»ç ÀÔÀÚ°¡ Æò±Õ À¯¼Ó ºÐÆ÷¸¦ º¯È½ÃŲ´Ù´Â °ÍÀº ¸Å¿ì Àß ¾Ë·ÁÁø »ç½ÇÀÌ´Ù. ±×·¯³ª À¯»ç ÀÔÀÚ°¡ ¾î¶² ¿ªÇÒÀ» ÇÏ´ÂÁö, ¾î¶² ¸Å°³ º¯¼ö°¡ º¯ÈÇÒ °ÍÀÎÁö¿¡ ´ëÇØ¼´Â ÇöÀç±îÁöµµ ³íÀïÀÌ °è¼ÓµÇ°í ÀÖ´Ù. ÇÑÆí, ¾î¶² ¿¬±¸ÀÚµéÀº ³·ùÁß¿¡ À¯»çÀÔÀÚ°¡ ÅõÀԵǴõ¶óµµ Karman ¼ö´Â º¯ÇÏÁö ¾Ê´Â´Ù°í ÁÖÀåÇÏ¿´´Ù. º» ¿¬±¸¿¡¼´Â Karman ¼öÀÇ º¯È¿¡ ´ëÇÑ ±âÁ¸ÀÇ ¿¬±¸µéÀ» ÀçÆò°¡ÇÏ¿´´Ù. À̸¦ ÅëÇÏ¿© ±âÁ¸ ¿¬±¸µéÀÇ ¹æ¹ý¿¡¼ ¸î °¡Áö ¿À·ùµéÀ» ¹àÇô ³»¾úÀ¸¸ç, ¿Ö ÀÌ »çÇ×ÀÌ ¿À·£ µ¿¾È ³íÀïÀÌ µÇ¾î¿Ô´Â°¡ ÇÏ´Â ÀÌÀ¯¸¦ ã¾Æ³»¾ú´Ù. ¶ÇÇÑ ºÐ¼® °á°ú À¯»ç ÀÔÀÚÀÇ ÅõÀÔ¿¡ ÀÇÇØ Karman ¼ö´Â °¨¼ÒµÇÁö¸¸ ±× °¨¼Ò·®Àº ±âÁ¸ÀÇ ¿¬±¸µé¿¡¼ Á¦½ÃµÈ °Íº¸´Ù ÈξÀ ÀÛÀ½À» ¹àÇû´Ù. ¶ÇÇÑ º» ¿¬±¸´Â À¯»çÀÇ ÅõÀÔ¿¡ ÀÇÇØ Karman ¼ö°¡ °¨¼ÒµÇ´Â ±â±¸¸¦ Á¦½ÃÇÏ¿´´Ù. |
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It is well known that sediment particles introduced in open-channel turbulent flows change mean velocity profile, since Vanoni suggested the reduction of the Karman constant in 1946. However, how the sediment particles take such a role and what parameters would be changed have been debated up to now. Some researchers, on the other hand, have insisted that the constant would not be changed regardless of introducing sediment particles. The present study is a careful re-evaluation of the previous studies on this issue. The study revealed some questionable approaches or methods in the decision of the previous researches and found the reason why this issue has been debated for a long time. The result indicated that the Karman number is reduced by adding sediment particles, but the amount of reduction is much smaller than the previous researches insisted. Finally, the present study proposes a mechanism of the Karman number reduction due to sediment particles. |
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Ű¿öµå |
³·ù;À¯¼Ó ºÐÆ÷;À¯»ç ÀÔÀÚ;Karman ¼ö;turbulent flow;velocity profile;sediment particle;Karman number; |
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Çѱ¹¼öÀÚ¿øÇÐȸ³í¹®Áý / v.39, no.9, 2006³â, pp.727-735
Çѱ¹¼öÀÚ¿øÇÐȸ
ISSN : 1226-6280
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200634741700155)
¾ð¾î : Çѱ¹¾î |
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³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø |
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