Numerical Study on Acoustic Resonance Excitation in Closed Side Branch Pipeline Conveying Natural Gas

Figure 9

Pressure amplitude of dominant frequency with corresponding time intervals ( = 50 m/s): (a) pressure fluctuation FFT analysis ( = 50 m/s, t1 = 0–0.2 s), (b) pressure fluctuation FFT analysis ( = 50 m/s, t2 = 0.2–0.6 s), (c) pressure fluctuation FFT analysis ( = 50 m/s, t3 = 0.6–0.8 s), (d) pressure fluctuation FFT analysis ( = 50 m/s, t4 = 0.8–1.0 s), (e) pressure fluctuation FFT analysis ( = 50 m/s, t5 = 1.4–2.0 s), and (f) variation of pressure amplitude of dominant frequency with the corresponding time interval ( = 50 m/s).

(a)

(b)

(c)

(d)

(e)

(f)