Transcription of STATIC, STAGNATION, AND DYNAMIC PRESSURE
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STATIC, STAGNATION, AND DYNAMIC PRESSURE
STATIC, STAGNATION, AND DYNAMIC PRESSURESB ernoulli equation is Inthisequationpiscalledstaticpressure, ,iftheinstrumentwerestaticwithrespecttof lowingfluid, , , tap ,drilledcarefullyinthewall, gzVp ME304 51 Inafluidstreamfarfromawall,orwherestream linesarecurved,accuratestaticpressuremea surementscanbemadebycarefuluseofastaticp ressureprobe, , (Pitottube).Inincompressibleflow,applyin gBernoulliequationbetweenpointsinthefree streamandatthenoseoftubeandtakingz=0atth etubecenterline,wegetwhereP0isthestagnat ionpressure, ,weget,and for the speed 2220200 VpVp 2021 Vpp 221V ppV 0221 ppV 02ME304 52 The static PRESSURE corresponds to a point Ais read from the wall static PRESSURE tap.
Each term has dimensions of length, or “head” of flowing fluid. The individual terms are is the head due to local static pressure is the head due to local dynamic pressure z is elevation head H is the total head of the flow The energy grade line (EGL): The locus of points at a vertical distance,, measured above a horizontal datum,
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