Relative Ratio
Calculation of relative atmospheric ratios.
Description
The Relative Ratio block calculates relative values of atmospheric quantities, including relative temperature value and , relative pressure value and relative density value .
The value represents the ratio of the airflow temperature at the selected reference station to standard atmospheric conditions at sea level:
.
The value represents the ratio of the airflow pressure at the selected reference station to standard atmospheric conditions at sea level:
.
The value represents the ratio of airflow density at the selected reference station to standard atmospheric conditions at sea level:
.
Limitations
For cases where relative values of total temperature, total pressure or total density (Mach number different from zero) are to be obtained, the total temperature, total pressure or total density are calculated from an ideal gas (with constant molecular weight, constant heat capacity at constant pressure and constant specific heat capacity coefficient) and dry air.
Ports
Input
Mach - Mach number
scalar
Mach number in the form of a scalar.
Data types: Float64.
γ - coefficient
scalar
The ratio between the specific heat capacity at constant pressure and the specific heat capacity at constant volume , given as a scalar.
.
Data types: Float64.
To(K) - static temperature
scalar
Static temperature given as a scalar.
Data types: Float64.
P0(Pa) - static pressure
scalar
Static pressure given as a scalar.
Data types: Float64.
ρ0(kg/m3) - static density
scalar
The static density given as a scalar.
Data types: Float64.
Output
θ - relative temperature value
scalar
Relative temperature value ( ) returned as a scalar.
Data types: Float64.
sqrt(θ) - square root of the relative temperature value
scalar
The square root of the relative temperature value ( ), returned as a scalar.
Data types: Float64.
δ - relative pressure value
scalar
Relative pressure value ( ) returned as a scalar.
Data types: Float64.
σ - relative density value
scalar
Relative density value ( ) returned as a scalar.
Data types: Float64.