96 lines
3.3 KiB
Python
96 lines
3.3 KiB
Python
from input.natural_constants import *
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m_pl = 2747 # payload mass in [kg] (incl. flight-chain)
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m_bal_init = 0 # initial ballast mass in [kg]
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m_film = 1883.77 # mass of balloon film in [kg]
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FreeLift = 10 # (initial) free lift in [%]
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V_design = 1120497.6 # (max.) balloon design volume in [m^3]
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start_height = -25.9254 # start altitude in [m]
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start_lat = -77.8535 # start latitude in [deg]
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start_lon = 167.2022 # start longitude in [deg]
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start_utc = '2019-12-15 13:56:00.000' # start date and time in UTC
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simple = False # simple mode (no use of ERA5 radiation data)
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c_virt = 0.37
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t_sim = 25000 #1000000 # simulated flight duration in [s]
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drag_model = 'Palumbo' # 'PalumboLow' # 'PalumboHigh' # 'Sphere_Re'
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#ERA5_ascent = ['ERA5/ascent.nc'] # list of all ERA5 atmospheric data for ASCENT
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#ERA5_float = ['ERA5/float1.nc', 'ERA5/float2.nc'] # list of all ERA5 atmospheric data for FLOAT
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#ERA5_single = ['ERA5/radiation1.nc', 'ERA5/radiation2.nc'] # list of all ERA5 RADIATION data
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ERA5_ascent = ['ERA5/ASCENT_McMurdo_2019_12.nc'] # list of all ERA5 atmospheric data for ASCENT
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ERA5_float = ['ERA5/FLOAT_McMurdo_2019_12to2020_1.nc'] # list of all ERA5 atmospheric data for FLOAT
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ERA5_single = ['ERA5/SINGLE_McMurdo_2019_12to2020_1.nc'] # list of all ERA5 RADIATION data
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# BALLOON DATA STUDIO
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#m_pl = 917
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#m_bal_init = 540
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#m_film = 0.74074232733 * 1838 # scaled down proportional to volume decrease between Raven 39.57 and 29.47
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#FreeLift = 10
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#V_design = 834497.469
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# SIMULATION
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# start_lat = 78.22 Svalbard
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# start_lon = 15.65
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# ONLY IN CASE OF APPLICATION OF SIMPLE MODEL:
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epsilon_ground = 0.95 # ground emissivity
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T_ground = 288.15 # ground temperature
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Albedo = 0.3 # total albedo
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cc = 0 # cloud cover
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c_d = 0.47 # drag coefficient balloon (spherical) [-] # 0.8
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m_gas_init = ((m_pl + m_film + m_bal_init) * (FreeLift/100 + 1))/(R_gas/R_air - 1) # lifting gas mass in [kg]
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print("Reading balloon data...")
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print("")
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print("Calculated initial gas mass based on free lift input:")
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print('{:.5}'.format(m_gas_init)+' kg')
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# GROSSER BALLON
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#V_design = 1120497.6 # maximum fillable balloon volume in [m^3]
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#L_goreDesign = 1.914 * V_design ** (1/3)
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#c_ducts = 0.62
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c_valve = 0.77 # estimated
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A_ducts = 76.54 # estimated
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A_valve = 0.140
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#t_open = 20 # time it takes to open vents in [s]
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#t_close = 20 # time it takes to open vents in [s]
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#m_baldot = m_bal_init/1375 # ballast mass drop rate in [kg/s]
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# kleiner Ballon
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L_goreDesign = 1.914 * V_design ** (1/3)
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c_ducts = 0.62
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#c_valve = 0.72 # estimated for STUDIO balloon
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#A_ducts = 55.743 # estimated for STUDIO balloon
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#A_valve = 0.1297
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t_open = 20 # time it takes to open vents in [s]
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t_close = 20 # time it takes to close vents in [s]
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m_baldot = m_bal_init/1375 # ballast mass drop rate in [kg/s]
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# THERMO-OPTICAL
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alpha_VIS = 0.024
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r_VIS = 0.060
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tau_VIS = 0.916
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epsilon = 0.100
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alpha_IR = 0.100
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tau_IR = 0.860
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r_IR = 0.040
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c_f = 2092 # [J/(kg*K)] specific heat balloon film
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