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Optimum expansion ration documentation update #269

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Optimum expansion ration documentation update #269

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13 changes: 11 additions & 2 deletions motorlib/nozzle.py
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Original file line number Diff line number Diff line change
Expand Up @@ -8,8 +8,17 @@
from .simResult import SimAlert, SimAlertLevel, SimAlertType
from .constants import maximumRefDiameter, maximumRefLength

def eRatioFromPRatio(k, pRatio):
"""Returns the expansion ratio of a nozzle given the pressure ratio it causes."""
def eRatioFromPRatio(k: float, pRatio: float) -> float:
"""
Returns the expansion ratio of a nozzle given the pressure ratio it causes.

Args:
k (float): ratio of specific heats (also known as the adiabatic index or heat capacity ratio)
pRatio (float): nozzle exit plane pressure at to stagnation pressure ratio

Returns:
float: Optimum expansion ratio
"""
return (((k+1)/2)**(1/(k-1))) * (pRatio ** (1/k)) * ((((k+1)/(k-1))*(1-(pRatio**((k-1)/k))))**0.5)

class Nozzle(PropertyCollection):
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