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Çѱ¹¼öÀÚ¿øÇÐȸ / v.41, no.3, 2008³â, pp.305-314
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°úºÎÇÏ ¿øÇü¸ÇȦ¿¡¼ÀÇ ¼Õ½Ç°è¼ö »êÁ¤À» À§ÇÑ ½ÇÇèÀû ¿¬±¸
( An Experimental Study for Estimation of Head Loss Coefficients at Surcharged Circular Manhole ) |
| ±èÁ¤¼ö;¼ÛÁÖÀÏ;Àå¼®Áø;À±¼¼ÀÇ; °æ±â´ëÇб³ ´ëÇпø Åä¸ñ°øÇаú;°æ±â´ëÇб³ ´ëÇпø Åä¸ñ°øÇаú;°æ±â´ëÇб³ ´ëÇпø Åä¸ñ°øÇаú;°æ±â´ëÇб³ Åä¸ñ.ȯ°æ°øÇкÎ;
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| µµ½Ã ¿ì¼ö ¹è¼ö ½Ã½ºÅÛ¿¡¼ ¿ì¼ö °ü°Å´Â °³¼ö·Î È帧 »óÅ·Π°¡Á¤ÇÏ¿© ¼³°èµÇ¾ú±â ¶§¹®¿¡ ¸ÇȦ¿¡¼ÀÇ ¿¡³ÊÁö ¼Õ½ÇÀº ÀϹÝÀûÀ¸·Î Áß¿äÇÏ°Ô °í·ÁµÇÁö ¾Ê¾Ò´Ù. ±×·¯³ª °úºÎÇÏÈ帧¿¡¼ ¿¡³ÊÁö ¼Õ½ÇÀº °ü°ÅÀÇ ¹è¼ö´É·ÂÀ» ÀúÇϽÃÄÑ µµ½ÉÁö¿ªÀÇ Ä§¼öÇÇÇØ¸¦ °¡Áß½ÃŰ´Â ¿äÀÎÀÌ µÈ´Ù. ±×·¯¹Ç·Î °úºÎÇÏ ¸ÇȦ ³»¿¡¼ÀÇ ¼öµÎ ¼Õ½ÇÀ» ºÐ¼®ÇÒ Çʿ䰡 ÀÖ´Ù. º» ¿¬±¸¿¡¼´Â ¸ÇȦ¿¡ ´ëÇÑ ¹®ÇåÁ¶»ç ¹× ÇöÀåÁ¶»ç¸¦ ½Ç½ÃÇÏ¿© ½ÇÇèÀåÄ¡ Á¦ÀÛ°ú ½ÇÇèÁ¶°ÇÀ» ¼±Á¤ÇÏ¿´´Ù. ¼±Á¤µÈ ½ÇÇèÁ¶°ÇÀÎ ÀιöÆ® Çü»ó Á¶°Ç(CASE A, B, C), ´ÜÂ÷ Á¶°Ç(CASE I, II, III) ¹× ½ÇÇè À¯·®($1.0;{sim};5.6;{ell}/sec$)À» º¯È½ÃŰ¸é¼ ½ÇÇèÀ» ½Ç½ÃÇÏ¿´´Ù. ¸ÇȦ Á÷°æ($D_m$)°ú À¯ÀÔ°ü°æ($D_{in}$)ÀÇ ºñ($D_m/D_{in}$)°¡ Áõ°¡ÇÒ¼ö·Ï ¼Õ½Ç°è¼ö°¡ Áõ°¡ÇÏ¿´À¸¸ç, ¸ÇȦ ¼ö½É($h_m$)°ú À¯ÀÔ°ü°Å Á÷°æ($D_{in}$)ÀÇ ºñ($h_m/D_{in}$)°¡ $1.0{sim}1.5$ÀÏ ¶§ ¼Õ½Ç°è¼ö°¡ °¡Àå Å©°Ô »êÁ¤µÇ¾ú´Ù. ¶ÇÇÑ, CASE A, B, CÀÇ Æò±Õ ¼Õ½Ç°è¼ö´Â °¢°¢ 0.45, 0.37, 0.3À¸·Î »êÁ¤µÇ¾ú´Ù. ¸ÇȦ¿¡ UÀÚÇü ÀιöÆ®¸¦ ¼³Ä¡Çϸé, ¿øÇü ¸ÇȦ¿¡¼ ¿¡³ÊÁö ¼Õ½ÇÀ» Àú°¨½Ãų ¼ö ÀÖ´Ù. ¶ÇÇÑ »êÁ¤µÈ ¸ÇȦ¿¡¼ÀÇ ¼Õ½Ç°è¼ö´Â °úºÎÇÏÈ帧À» °í·ÁÇÑ ¿ì¼ö °ü°Å ¼³°è¿¡ Ȱ¿ëµÉ ¼ö ÀÖ´Ù°í ÆÇ´ÜµÈ´Ù. |
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| Urban sewer systems are designed to operate in open-channel flow regime and energy loss at circular manholes are usually not significant. However, the energy loss at manholes, often exceeding the friction loss of pipes under surcharge flow, is considered as one of the major causes of inundation in urban area. Therefore, it is necessary to analyze the head loss associated with manholes, especially in surcharge flow. Hydraulic experimental apparatus which can be changed the invert type(CASE A, B, C) and step height(CASE I, II, III) was installed for this study. The range of the experimental discharges were from $1.0{ell}/sec$ to $5.6;{ell}/sec$. As the manhole diameter ratio($D_m/D_{in}$) increases, head loss coefficient increases due to strong horizontal swirl motion. Head loss coefficient was maximum because of strong oscillation of water surface when the range of manhole depth ratios($h_m/D_{in}$) were from 1.0 to 1.5. The average head loss coefficients for CASE A, B, and C were 0.45, 0.37, and 0.30, respectively. Accordingly, U-invert is most effective for energy loss reduction at circular manhole. This head loss coefficients could be available to design the urban sewer system with surcharge flow. |
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| ¼öµÎ¼Õ½Ç°è¼ö;°úºÎÇÏÈ帧;¿øÇü¸ÇȦ;µµ½Ã ¿ì¼ö ¹è¼ö ½Ã½ºÅÛ;head loss coefficient;surcharge flow;circular manhole;urban sewer system; |
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Çѱ¹¼öÀÚ¿øÇÐȸ³í¹®Áý / v.41, no.3, 2008³â, pp.305-314
Çѱ¹¼öÀÚ¿øÇÐȸ
ISSN : 1226-6280
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200814256113788)
¾ð¾î : Çѱ¹¾î |
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| ³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø |
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