class Gtengine::Gas
Constants
- R
Attributes
alfa[RW]
p[RW]
t[RW]
Public Class Methods
new(t = 300.0, p = 101325.0, alfa = 99999999.0)
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# File lib/gtengine/gas.rb, line 5 def initialize(t = 300.0, p = 101325.0, alfa = 99999999.0) @t, @p, @alfa = t.to_f, p.to_f, alfa.to_f end
Public Instance Methods
average_cp()
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# File lib/gtengine/gas.rb, line 26 def average_cp return low_temperature_average_cp if t < 700.0 high_temperature_average_cp end
average_k()
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# File lib/gtengine/gas.rb, line 17 def average_k k_from(average_cp) end
cp()
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# File lib/gtengine/gas.rb, line 21 def cp return low_temperature_cp if t < 750.0 high_temperature_cp end
density()
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# File lib/gtengine/gas.rb, line 9 def density p / (t * R) end
k()
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# File lib/gtengine/gas.rb, line 13 def k k_from(cp) end
Private Instance Methods
first_high_cp()
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# File lib/gtengine/gas.rb, line 41 def first_high_cp 0.0267 / alfa + 0.26 + (0.032 + 0.0133 / alfa) * (0.001 * 1.176 * t - 0.88235) end
first_low_cp()
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# File lib/gtengine/gas.rb, line 57 def first_low_cp 0.0174 / alfa + 0.2407 + (0.0193 + 0.0093 / alfa) * (0.001 * 2.5 * t - 0.875) end
high_temperature_average_cp()
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# File lib/gtengine/gas.rb, line 69 def high_temperature_average_cp (((1.25 + 2.2 * alfa) / (alfa * 100000.0)) * (t + 450.0) + 0.218) * 4187.0 end
high_temperature_cp()
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# File lib/gtengine/gas.rb, line 37 def high_temperature_cp (first_high_cp - second_high_cp * third_high_cp) * 4187.0 end
k_from(c_p)
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# File lib/gtengine/gas.rb, line 33 def k_from(c_p) c_p / (c_p - R) end
low_temperature_average_cp()
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# File lib/gtengine/gas.rb, line 73 def low_temperature_average_cp (((2.25 + 1.2 * alfa) / (alfa * 100000.0)) * (t - 70.0) + 0.236) * 4187.0 end
low_temperature_cp()
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# File lib/gtengine/gas.rb, line 53 def low_temperature_cp (first_low_cp + second_low_cp * third_low_cp) * 4187.0 end
second_high_cp()
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# File lib/gtengine/gas.rb, line 45 def second_high_cp 0.374 * 0.01 + 0.0094 / (alfa ** 2.0 + 10.0) end
second_low_cp()
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# File lib/gtengine/gas.rb, line 61 def second_low_cp 0.002 - 0.001 * 1.056 / (alfa - 0.2) end
third_high_cp()
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# File lib/gtengine/gas.rb, line 49 def third_high_cp 5.5556 * 0.000001 * t ** 2.0 - 1.3056 * 0.01 * t + 6.67 end
third_low_cp()
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# File lib/gtengine/gas.rb, line 65 def third_low_cp 2.5 * 0.00001 * t ** 2.0 - 0.0275 * t + 6.5625 end