2021-05-03 10:40:35 +02:00
|
|
|
from input.natural_constants import *
|
|
|
|
|
|
|
|
|
|
# BALLOON DATA
|
|
|
|
|
m_pl = 917 #2174 # payload mass in [kg] (incl. flight-chain)
|
|
|
|
|
m_bal_init = 540 #500 # initial ballast mass in [kg]
|
|
|
|
|
m_film = 0.74074232733 * 1838 # mass balloon film in [kg]
|
|
|
|
|
FreeLift = 10 # (initial) free lift in [%]
|
|
|
|
|
|
|
|
|
|
c_virt = 0.37
|
|
|
|
|
|
|
|
|
|
# SIMULATION
|
|
|
|
|
|
|
|
|
|
start_height = 384.9 # start altitude in [m]
|
|
|
|
|
start_lat = 67.887382 # start latitude in [deg]
|
|
|
|
|
start_lon = 21.081452 # start longitude in [deg]
|
|
|
|
|
start_utc_old = '2016-07-12 03:17:24.000' # start date and time in UTC
|
|
|
|
|
start_utc = '2019-06-19 03:17:24.000' # start date and time in UTC
|
|
|
|
|
# possible start dates: between May 22 and June 22
|
|
|
|
|
simple = True
|
|
|
|
|
|
|
|
|
|
# ONLY IN CASE OF APPLICATION OF SIMPLE MODEL:
|
|
|
|
|
epsilon_ground = 0.95 # ground emissivity
|
|
|
|
|
T_ground = 288.15 # ground temperature
|
|
|
|
|
Albedo = 0.3 # total albedo
|
|
|
|
|
##cc = 0.1 # cloud cover
|
|
|
|
|
|
|
|
|
|
m_gas_init = ((m_pl + m_film + m_bal_init) * (FreeLift/100 + 1))/(R_gas/R_air - 1) # lifting gas mass in [kg]
|
|
|
|
|
|
|
|
|
|
print("initial gas mass:")
|
|
|
|
|
print(m_gas_init)
|
|
|
|
|
|
|
|
|
|
#GROSSER BALLON
|
|
|
|
|
#V_design = 1120497.6 # maximum fillable balloon volume in [m^3]
|
|
|
|
|
#L_goreDesign = 1.914 * V_design ** (1/3)
|
|
|
|
|
#c_ducts = 0.62
|
|
|
|
|
#c_valve = 0.77 # estimated
|
|
|
|
|
#A_ducts = 76.54 # estimated
|
|
|
|
|
#A_valve = 0.140
|
|
|
|
|
#t_open = 20 # time it takes to open vents in [s]
|
|
|
|
|
#t_close = 20 # time it takes to open vents in [s]
|
|
|
|
|
#m_baldot = m_bal_init/1375 # ballast mass drop rate in [kg/s]
|
|
|
|
|
|
|
|
|
|
# kleiner Ballon
|
|
|
|
|
V_design = 834497.469 # maximum fillable balloon volume in [m^3]
|
2021-01-25 12:25:41 +01:00
|
|
|
L_goreDesign = 1.914 * V_design ** (1/3)
|
2021-05-03 10:40:35 +02:00
|
|
|
c_ducts = 0.62
|
|
|
|
|
c_valve = 0.72 # estimated
|
|
|
|
|
A_ducts = 55.743 # estimated
|
|
|
|
|
A_valve = 0.1297
|
|
|
|
|
t_open = 20 # time it takes to open vents in [s]
|
|
|
|
|
t_close = 20 # time it takes to open vents in [s]
|
|
|
|
|
m_baldot = m_bal_init/1375 # ballast mass drop rate in [kg/s]
|
|
|
|
|
|
2021-01-11 10:53:13 +01:00
|
|
|
|
|
|
|
|
# THERMO-OPTICAL
|
|
|
|
|
alpha_VIS = 0.024
|
2021-05-03 10:40:35 +02:00
|
|
|
r_VIS = 0.060
|
2021-01-11 10:53:13 +01:00
|
|
|
tau_VIS = 0.916
|
2021-05-03 10:40:35 +02:00
|
|
|
epsilon = 0.100
|
|
|
|
|
alpha_IR = 0.100
|
|
|
|
|
tau_IR = 0.860
|
|
|
|
|
r_IR = 0.040
|
2021-01-11 10:53:13 +01:00
|
|
|
|
2021-05-03 10:40:35 +02:00
|
|
|
c_f = 2092 # [J/(kg*K)] specific heat balloon film
|
2021-01-11 10:53:13 +01:00
|
|
|
|
|
|
|
|
|
|
|
|
|
# DRAG
|
2021-05-03 10:40:35 +02:00
|
|
|
# c_d = 0.47 # drag coefficient balloon (spherical) [-]
|
|
|
|
|
|
2021-01-11 10:53:13 +01:00
|
|
|
|
|
|
|
|
|
