RCAIDE.Library.Methods.Aeroacoustics.Semi_Empirical.Turbofan.primary_noise_component

primary_noise_component#

Functions

primary_noise_component(Velocity_primary, ...)

This function calculates the noise contribution of the primary jet component.
primary_noise_component(Velocity_primary, Temperature_primary, R_gas, theta_p, DVPS, sound_ambient, Velocity_secondary, Velocity_aircraft, Area_primary, Area_secondary, DSPL_p, EX_p, Str_p)[source]#

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

Parameters:

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

  • Temperature_primary (float) – Temperature of the primary jet [K].

  • R_gas (float) – Specific gas constant [J/(kg·K)].

  • theta_p (float) – Angle for the primary jet [rad].

  • DVPS (float) – Design velocity parameter for the primary jet.

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

  • 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_p (float) – Decibel Sound Pressure Level for the primary jet [SPL].

  • EX_p (float) – Excess noise level for the primary jet.

  • Str_p (float) – Strouhal number for the primary jet.

Returns:

SPL_p – Sound Pressure Level for the primary jet component [dB].

Return type:

float

Notes

The function uses empirical methods to calculate the noise contribution of the primary jet component.

Definitions

‘SPL_p’

Sound Pressure Level for the primary 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)