RCAIDE.Library.Methods.Noise.Frequency_Domain_Buildup.Rotor.LBL_VS_broadband_noise

LBL_VS_broadband_noise

LBL_VS_broadband_noise(R_c, alpha_star, delta_p, r_e, L, M, Dbar_h, f, U)

This computes the laminar boundary layer compoment of broadband noise using the method outlined by the Brooks, Pope and Marcolini (BPM) Model

Assumptions:

BPM models assumes a naca 0012 airfol

Source:

BPM Model: Brooks, Thomas F., D. Stuart Pope, and Michael A. Marcolini. Airfoil self-noise and prediction. No. L-16528. 1989.

Inputs:

R_c - Reynolds number [-] alpha_star - angle of attack blade section [deg] delta_p - boundary layer of pressure section [m L - length of blade section [m] U - velocity of blade section [m/s] M - Mach number [-] c - airfoil section chord [m] f - frequency spectrum [Hz] Dbar_h - high frequency directivity term [-] r_e - distance from noise source to observer [m]

Outputs

SPL_LBL_VS - Sound pressure level of laminar boundary layer [dB]

Properties Used:

N/A

compute_G_1(e)

This computes the G_1 function using the BPM model

Assumptions:

BPM models assumes a naca 0012 airfol Corrections made to match experimental results

Source:

BPM Model: Brooks, Thomas F., D. Stuart Pope, and Michael A. Marcolini. Airfoil self-noise and prediction. No. L-16528. 1989.

Inputs:

e [-]

Outputs

G_1 [-]

Properties Used:

N/A

compute_G_2(d)

This computes the G_2 function using the BPM model

Assumptions:

BPM models assumes a naca 0012 airfol

Source:

BPM Model: Brooks, Thomas F., D. Stuart Pope, and Michael A. Marcolini. Airfoil self-noise and prediction. No. L-16528. 1989.

Inputs:

d [-]

Outputs

G_2 [-]

Properties Used:

N/A

compute_G_3(alpha_star)

This computes the G_3 function using the BPM model

Assumptions:

BPM models assumes a naca 0012 airfol

Source:

BPM Model: Brooks, Thomas F., D. Stuart Pope, and Michael A. Marcolini. Airfoil self-noise and prediction. No. L-16528. 1989.

Inputs:

alpha_star [deg]

Outputs

G_3 [-]

Properties Used:

N/A

compute_R_c_0(alpha_star)

This computes the R_c_0 function using the BPM model

Assumptions:

BPM models assumes a naca 0012 airfol

Source:

BPM Model: Brooks, Thomas F., D. Stuart Pope, and Michael A. Marcolini. Airfoil self-noise and prediction. No. L-16528. 1989.

Inputs:

alpha_star [deg]

Outputs

R_c_0 [-]

Properties Used:

N/A