2021  OriginalPaper  Chapter Open Access
Effects of a Launcher’s External Flow on a DualBell Nozzle Flow
Authors: Istvan Bolgar, Sven Scharnowski, Christian J. Kähler
Publisher: Springer International Publishing
1 Introduction
2 Experimental Setup
\(Ma_\infty \)

\(p_0\)
\(\mathrm {(bar)}\)

\(p_\infty \)
\(\mathrm {(bar)}\)

\(T_0\)
\(\mathrm {(K)}\)

\(U_\infty \)
\(\mathrm {(m/s)}\)


\(0.80 \pm 0.0008\)

\(1.30 \pm 0.0013\)

\(0.852 \pm 0.0008\)

\(291 \pm 1.2\)

\({\approx }258\)

\(2.00 \pm 0.0010\)

\(2.50 \pm 0.0022\)

\(0.320 \pm 0.0004\)

\(292 \pm 1.6\)

\({\approx }509\)

\(Ma_\infty \)

\(p_0\)
\(\mathrm {(bar)}\)

\(p_\infty \)
\(\mathrm {(bar)}\)

\(T_0\)
\(\mathrm {(K)}\)

\(U_\infty \)
\(\mathrm {(m/s)}\)


\(0.80_{0.01}\)

2.0 – 1.4 in 5 s

1.31 – 0.92 in 5 s

\(294 \pm 0.3\)

\({\approx }259\)

\(1.60_{0.01}\)

5.0 – 4.0 in 5 s

1.17 – 0.94 in 5 s

\(294 \pm 0.3\)

\({\approx }447\)

2.1 BFS Model
\(Ma_\infty \)

\(p_{n,0}\)
\(\mathrm {(bar)}\)

NPR


0.80

\(6.00_{0.05}\)

\({\approx }7\)

2.00

\(6.00_{0.05}\)

\({\approx }19\)

\(Ma_\infty \)

\(p_{n,0}\)
\(\mathrm {(bar)}\)

NPR


0.80

\(9.8^{+0.02}_{0.04}\)

8.7 – 10.6

1.60

\(3.5_{0.03}\)

3.0 – 3.7
