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

jet_installation_effect(Xe, Ye, Ce, theta_s, Diameter_mixed)[source]#

This calculates the installation effect, in decibels, to be added to the predicted secondary jet noise level.

Parameters:

  • Xe (float) – Fan exit location downstream of the leading edge (Xe < Ce) [m].

  • Ye (float) – Separation distance from the wing chord line to nozzle lip [m].

  • Ce (float) – Wing chord length at the engine location [m].

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

  • Diameter_mixed (float) – Diameter of the mixed jet [m].

Returns:

INST_s – Installation effect adjustment for the secondary jet noise level [dB].

Return type:

float

Notes

The function calculates the installation effect based on geometric parameters and angles, assuming a significant impact on secondary jet noise levels.

Definitions

‘INST_s’

Installation effect, the adjustment in decibels due to the installation of the jet.

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)