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The driver gas of a shock tube is air the diaphragm

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Unformatted text preview: hock tube experiment can be whether the expansion wave remains completely in the driver section. The driver gas of a shock tube is air. The diaphragm is broken and the expansion fan propagates into the gas. Determine the pressure ratio across the expansion fan for which the trailing wave of the fan just avoids getting sucked through the diaphragm. 4. The driver and driven gases in a shock tube are both air initially at 800K. The initial pressure ratio across the diaphragm is p4/p1=17 (see Anderson figures 7.2 and 7.3) and the initial pressure in the driver section is 1000kPa. (a) Calculate the pressure ratio across the shock p2/p1 and the pressure ratio across the expansion wave p3/p4. (b) Calculate the speed of the shock, of the contact surface, and of the leading and trailing edges of the expansion wave, relative to the tube. (c) Plot the motion of these features accurately on an x‐t diagram. (Assume the tube is long enough so that wave reflections don't occur)....
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