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. The stagnation pressureis measured directly at Aby the total head probes are combined as in pitot- static tube. The inner tube is used to measure the stagnation pressureat point Bwhile the static PRESSURE at Cis measured by the small holes in the 53 , , 54To be completed in classME304 55 RELATION BETWEEN THE FIRST LAW OF THERMODYNAMICS AND THE BERNOULLI equation (Energy equation)Restrictions:1) 2) 3) 4) Steady flow5) Uniform flow and properties at each sectionUnder these restrictionsBut from continuity under these restrictionsor CSCothershears

The static pressure corresponds to a point A is read from the wall static pressure tap. The stagnation pressure is measured directly at A by the total head tube. Two probes are combined as in pitot-static tube.The inner tube is used to measure the stagnation pressure at point B while the static pressure at C is measured by the small holes in the outer tube.

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  Pressure, Static, Static pressure

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