sonic velocity´Â critical pressure ratio (P2/P1 = Pc/P1) ÀÏ ¶§ »ý¼ºÀ̵˴ϴÙ.
±×¸®°í ÀÌ critical pressur ratio´Â k (=Cp/Cv) °ª¿¡ ÀÇÇØ °áÁ¤µË´Ï´Ù.
±×°ÍÀÌ º¸Åë 50% Á¤µµ¶ó ¾Ë°í ÀÖ½À´Ï´Ù.
1. ±×·±µ¥! ¸¸¾à ¾î¶² lineÀÌ Vessel bottom¿¡¼ ³ª¿Í pump¿¡¼ boosting ÇÏ¿© Áß°£¿¡ valve, °¢ Á¾ fitting µîÀ» °ÅÄ¡¸é¼ pressure dropÀÌ »ý±â°í, °á±¹ »ó¾ÐÀÇ ´Ù¸¥ vessel¿¡ µé¾î°¥ ¶§.
pump Ãⱸ¿¡¼ÀÇ pressure°¡ 30 barA, ±×¸®°í ´Ù¸¥ vessel ÀÔ±¸ Á÷Àü±îÁöÀÇ ¾Ð·ÂÀÌ 1.2 barA ¶ó°í ÇÑ´Ù¸é,
±×¸®°í ÀÌ line (pump Ãⱸ¿¡¼ vessel ÀÔ±¸ ±îÁö) ÀÌ ¸ñÀûÁöÀÇ vessel ÀÔ±¸¿¡¼ sonic velocity°¡ »ý±â°Ô µÇ´Â °ÍÀÎÁö¿ä..
2. critical pressure ratio´Â k °ª¿¡¸¸ ÀÇÁ¸ÇÏ°í (¹°·Ð ÀÌ»ó±âüÀ϶§), ±×¸®°í sonice velocityµµ (kzRT)^0.5 = (kPV/m)^0.5 [k=Cp/Cv, z= ¾ÐÃàÀÎÀÚ, R=individual gas constant, T:¿Âµµ] ·Î¼, k,z,T¿¡¸¸ ÀÇÁ¸ÇÕ´Ï´Ù. °á±¹ ÀÌ ¸»Àº pipeÀÇ size¶ûÀº sonic flow Çü¼ºÀ̳ª ¼Óµµ¿¡ ¾Æ¹«·± °ü·ÃÀÌ ¾ø´Ù´Â °ÍÀΰ¡¿ä?
¸¸¾à Control valve inlet : 50 barA, line size 10", outlet : 10 bar, 20" À̶ó°í ÇÒ ¶§, outlet line size¸¦ 30" À¸·Î Áõ°¡½ÃÅ°°Å³ª, 10" À¸·Î °¨¼Ò½ÃÄѵµ sonic flow Çü¼ºÀ̳ª ¼Óµµ¿¡´Â ¿µÇâÀÌ ¾ø´Â °ÍÀÎÁö¿ä..