µ±Ç°Î»ÖãºÊ×Ò³ > ·ç¶´¸ÅÂÛ¼°Éè¼Æ
?vD?1.87?107 ¿ÉÒÔÇóµÃʵÑé¶ÎµÄÀ×ŵÊýRe??´Ëʱ£¬À×ŵÊý±È½ÏС£¬Òò¶ø¸½Ãæ²ã±È½Ïºñ£¬ÊµÑé¶Î¿ÉÒÔÈÏΪÊǹ⻬¹Ü£¬Ä¦²ÁËðʧϵÊý?½öÓëÀ×ŵÊýÓйأ¬¶øÓë´Ö²Ú¶ÈÎ޹ء£Í¨¹ý¹«Ê½ÇóµÃ£º
??0.0032?0.221Re?0.237?0.00738 ËùÒÔ£¬¿ÉÒÔÇóµÃ
K0??L?0.00738?6.55/2.73?0.0177 D0¢Ú À©Ñ¹¶ÎËðʧ£º
ÆøÁ÷¾¹ýÀ©Ñ¹¶ÎµÄËðʧ¹«Ê½Îª£º
??4???ƽ¾ù??D1????K???0.6tan?1????
?2????D2????8tan???2?ÓÉÓÚËðʧϵÊýKµÄ²Î¿¼¶¯Ñ¹ÎªÀ©Ñ¹¶ÎÈë¿ÚµÄÖµ£¬¼´ÎªÊµÑé¶Î¶¯Ñ¹£¬ËùÒÔÓÐ
??4???ƽ¾ù???D1????K???0.6tan?1????
?2??D2????8tan?????2?K0ÆäÖÐ?ƽ¾ù¸ù¾ÝÀ©Ñ¹¶ÎÖмäÆÊÃæÉϵÄÀ×ŵÊýÇóµÃ¡£À©Ñ¹¶ÎÖмäÆÊÃæµÄËÙ¶ÈΪ£º
?D1??2.73?v?v1???100????64m/s
?3.4??D?22?vD?1.495?107 ËùÒÔRe????0.0032?0.221Re?0.237?0.0076
½ø¶øÇóµÃ
??4???ƽ¾ù???D1????K???0.6tan?1?????0.0398?2??D2????8tan?????2?K0
¢Û »ØÁ÷¶ÎËðʧ£º
»ØÁ÷¶ÎÒ²ÓÐÀ©É¢½Ç£¬Êµ¼ÊÉÏÒ²ÊÇÒ»¸öÀ©Ñ¹¶Î£¬ËùÒÔÆäËðʧϵÊýµÄ¼ÆË㹫ʽΪ£º
??42?????F??D??F??ƽ¾ù??K?0????0.6tan??1??1???0??0.02346?2??F??F1??D2????1??8tan???2?2K0
¢Ü ¹Õ½ÇËðʧ£º
ÒòΪÕâÀïÉè¼ÆµÄ·ç¶´²¢·Ç´óÐÍ·ç¶´£¬²ÉÓþÑ鹫ʽ½üËÆ¼ÆË㣬¹«Ê½Îª£º
K0½ØÃæ»ý
???F?24.55?0??0.10???£¬ÆäÖÐFΪ¹Õ½Çʱ·ç¶´2.58??F?lgRe?????µÚÒ»¡¢ ¶þ¹Õ½Ç
?D1??2.73?v?v?100??ËÙ¶ÈΪ???44.4m/s 1??4.1??D2?22?vD?1.754?106 ËùÒÔRe??K0???F?24.55?0??0.10????0.02759 2.58???F?lgRe????µÚÈý¡¢ ËĹսÇ
?D1??4.1?v?v?44.4??ËÙ¶ÈΪ???14.4m/s 1??7.2??D2?22?vD6Re??0.100?10ËùÒÔ
?K0???F?24.55?0??0.10????0.0035 2.58???F?lgRe????¢Ý ·äÎÑÆ÷Ëðʧ£º
ÒòΪÎÒÃÇÑ¡ÓõķäÎÑÆ÷³¤¾¶±ÈΪLM?6£¬ËùÒÔ¶ÔÓ¦µÄ·½ÐηäÎѸñ×ÓµÄËðʧϵÊýK?0.22¡£Æäµ±Á¿ËðʧϵÊý£º
K0?K??F0??£¬ÆäÖÐFΪÎȶ¨¶Î½ØÃæ F??2ËùÒÔK0?0.00449
¢Þ ÎÉÁ÷ÍøËðʧ£º
ÎÒÃÇ¿ÉÒÔÇóµÃÎȶ¨¶ÎµÄËÙ¶È£º
?D1??4.1?v?v1???44.4????14.4m/s
?7.2??D2?ÒòΪÆäËÙ¶È´óÓÚ9Ã×/Ãë£¬ÆøÁ÷Á÷¾ÎÉÁ÷ÍøµÄËðʧ¿ÉÒÔ
22°´K?1???2?d???1?¼ÆË㣬ÆäÖÐ??
l??2ÕâÀïΪÁËÈÃÕûÁ÷Ч¹û½ÏºÃ£¬²ÉÓÃÁË4²ãÎÉÁ÷Íø£¬ËùÒÔÆäËðʧϵÊý½Ï´óK0?0.0614 ¢ß ÊÕËõ¶ÎËðʧ£º
ÓÉÓÚÈÎÎñÖÐÖ»¸ø³öÊÕËõ¶ÎµÄÊÕËõ±ÈΪ7£¬²¢Ã»Óиø¶¨ÆäËûÊý¾Ý¡£²Î¿¼¡¶µÍËÙ·ç¶´Éè¼Æ¡·±í2-4µäÐÍ·ç¶´¸÷²¿¼þËðʧ¼°ÄÜÁ¿±È¡£ÎÒÃÇÔ¤¹ÀÆäÊÕËõ¶ÎµÄËðʧϵÊýK0?0.007
¢à ×ÜËðʧ£º?K0?0.2160
ËùÒÔ·ç¶´ÄÜÁ¿±È?·ç¶´?4.63
Æß¡¢ ÐèÓù¦ÂÊ
·ç¶´ËùÐ蹦ÂÊ£º
N×Ü=1?µç»ú?·çÉÈ?1?13??v0F0 ?·çÉÈ21¸ù¾ÝÉè¼ÆÊéÒªÇ󣺵ç»úЧÂÊ?d=90%¡¢»úеЧÂÊ?j=85%¡¢·çÉÈЧÂÊ?f=80%£¬ËùÒÔ
N×Ü= =1?µç»ú?·çÉÈ?1?13??v0F0?·çÉÈ211111????1.225?1003?7.5 90?%4.632 =1.38?106W
¹²·ÖÏí92ƪÏà¹ØÎĵµ