The main parameter of the orifice hole diameter was designed according to the range of throttle diameter ratio which gave the required discharge coefficient. The discharge coefficient is determined by difference diameter ratios. The value of discharge coefficient is 0.958 occurred at throttle diameter ratio 0.5. The throttle hole diameter is 80 mm. The flow analysis is done numerically using ANSYS 17.0, computational fluid dynamics. The flow velocity was analyzed in the upstream and downstream of the orifice meter. The downstream velocity of non-standard orifice meter is 2.5% greater than that of standard orifice meter. The differential pressure is 515.379 Pa in standard orifice.<\/p>\r\n","references":"[1]\tW. R. Miller, Flow measurement engineering hand book, 3rd ed, New York: McGraw-Hill, 1996\r\n\r\n[2]\tM. Reader-Harris, \u201cOrifice Plates and Venturi Tube\u201d, ISBN 978-3-319-16879-1, http:\/\/www.springer.com\/978-3-319-16879-1, 2015 \r\n[3]\tM. Reader-Harris, J A Sattary & E P Spearman, \u201cFlow Measurement Instrumentation,\u201d 6,(2), (1995)101.\r\n[4]\tG. L. Morrison, K.R Hall, M.L. Macek, \u201cUpstream Velocity Profile effects on orifice flowmeters,\u201d Flow Meas. Instrum., 2 (5), (1994) 92 \r\n[5]\tC N B Martin, \u201cInt J Heat Fluid Flow\u201d, 3(3)(1982)135-141.\r\n[6]\tJ S Irving, \u201cInt J Heat Fluidd Flow,\u201d 1(1)(1979)5-11.\r\n[7]\tS N Singh, B K Gandhi, V Seshadi & V S Chauhan, \u201cFlow Meas Instrum\u201d,15 (2)92004)97-103.\r\n[8]\tZ D Husain & F D Goodsan, \u201c(ASME, Montvillargenne, Fr,1986),p. des Milieus poreux.; Ecole des Mines de Paris, Paris, Fr,1986\u2019\u2019\r\n[9]\tR K Singh,S N Singh & V Seshadri, \u201cPerformance evaluation of orifice plate assemblies under non-standard conditions using CFD\u201d,5(10)(2010).\r\n[10]\tWar War Min Swe, \u201cAerodynamic Performance of Backward Centrifugal Fan with Rectangular Casing,\u201d Ph.D Dissertation, Graduate School of Engineering Nagasaki University, 2017.","publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 153, 2019"}