RCAIDE.Library.Methods.Aeroacoustics.Semi_Empirical.Turbofan.secondary_noise_component.secondary_noise_component#

secondary_noise_component(Velocity_primary, theta_s, sound_ambient, Velocity_secondary, Velocity_aircraft, Area_primary, Area_secondary, DSPL_s, EX_s, Str_s)[source]#

This function calculates the noise contribution of the secondary jet component.

Parameters:

  • Velocity_primary (float) – Velocity of the primary jet [m/s].

  • theta_s (float) – Angle for the secondary jet [rad].

  • sound_ambient (float) – Ambient sound level [dB].

  • Velocity_secondary (float) – Velocity of the secondary jet [m/s].

  • Velocity_aircraft (float) – Velocity of the aircraft [m/s].

  • Area_primary (float) – Area of the primary jet [m^2].

  • Area_secondary (float) – Area of the secondary jet [m^2].

  • DSPL_s (float) – Decibel Sound Pressure Level for the secondary jet [dB].

  • EX_s (float) – Excess noise level for the secondary jet.

  • Str_s (float) – Strouhal number for the secondary jet.

Returns:

SPL_s – Sound Pressure Level for the secondary jet component [dB].

Return type:

float

Notes

The function uses semi-empirical methods to calculate the noise contribution of the secondary jet component.

Definitions

‘SPL_s’

Sound Pressure Level for the secondary jet component.

References

[1] SAE ARP876D: Gas Turbine Jet Exhaust Noise Prediction (original) [2] de Almeida, Odenir. “Semi-empirical methods for coaxial jet noise prediction.” (2008). (adapted)