Page 242 - 48Fundamentals of Compressible Fluid Mechanics
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204CHAPTER 12. EVACUATING/FILING CHAMBERS UNDER EXTERNAL VOLUME CONTROL
2.2
*
. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . . .. . . . .. . . . .. . . . .. . . . .. . . . .. . . . . .. . . . . .. . . . . .. . . . . . .. . . . . . . * * * A c 0.1 ...........
2 * *
1.8 * * *
1.6 * * A = 0.0
1.4 * * * * 0.5 *
1.0
1.2 * * * * * * * 1.5 ´
P(t) 1 * * * * * * * 4.0
P(0)
0.8
0.6
´ ´ ´ ´ ´ ´ ´ ´ ´ ´ ´ ´ ´ ´ ´ ´ ´ ´ ´ ´ ´ ´ ´ ´ ´ ´ ´ ´ ´ ´ ´ ´ ´
0.4 ´ ´
´
´
´
0.2
0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
DIMENSIONLESS TIME, t, or, CYLINDER VOLUME FRACTION
Fig. 12.3: The pressure ratio as a function of the dimensionless time for choked condition
