Research Article

Investigation on Acoustic Properties of Thruster Chamber with Coaxial Injectors and Plenum Chamber

Table 4

Eigenfrequency, power amplitude, and damping rate of acoustic modes in the Model B chamber.

Length of the injector ()
02.23.24.46.27.810

Resonator’s tuning frequency (, Hz)37502578187513301057825
1L acoustic modeEigenfrequency (Hz)9859448531126
Amplitude (kPa)0.761.11.10.58
Damping factor11.8%11.2%17.3%11.5%
2T acoustic modeEigenfrequency (Hz)3771377737913798379838423567
Amplitude (kPa)1.170.721.11.150.310.571.18
Damping factor3.4%3.5%2.5%2.1%3.5%2.1%
1L2T acoustic modeEigenfrequency (Hz)3961415540763988417840494131
Amplitude (kPa)0.581.11.650.650.80.890.61
Damping factor8.2%2.4%2.4%3.2%4.3%2.0%3.4%
2L2T acoustic modeEigenfrequency (Hz)44614626436845584507
Amplitude (kPa)0.310.80.330.490.44
Damping factor3.2%3.7%1.9%4.6%2.0%
Unidentified frequency peakEigenfrequency (Hz)3323
Amplitude (kPa)0.59
Damping factor5.3%