There are several types of static pressure installations for
aircraft:
Fuselage nose installation
Wing-Tip installation
Vertical Fin Installation
Fuselage vent installation
These types have different characteristics, There are advantages and disadvantages of each type of installation.
1. Fuselage installation
This type is usually located at the front of the aircraft(more precisely at the nose).
Variations in static pressure errors from orifices position depend on fuselage diameter and fuselage shape. Look at the following chart!
From the figure it can be seen that a large error that occurs when the value of x / D = 1. Large error of:
circular nose = 9% qc
elliptical nose = 4%qc
ogival nose = 1%
The data shows that the shape of the pitot great influence error occurred. Then the position of the orifice also affects the large static pressure error. The data below shows that the different placement of the nose boom affects the amount of error. The higher the coefficient of lift force (qc), the greater the static pressure error decreases. This proves that the placement of the correct orifices affects the existing static compressive errors.
2. Wing-Tip installation
This type is almost the same as Fuselage nose installation, which is related to the shape and placement of the orifices. But for Wing-Tip installation that affects the shape of the airfoil, thickness of the airfoil and the span wise location of the boom.
The following data shows that static pressure is highest if the placement of the orifices is close to the wing. The error value will decrease rapidly when x / t of the orifices is 10 with a decrease of 1% of the coefficient of lift (qc).
From that data if the value of x/c = 1 or greater, we get a constant static pressure error when the Mach number reaches 1.5 or more. Error can also be negative up to -6% of the coefficient of lift it is at the stall speed shown in the graph above.
In conclusion, the magnitude of the error in fuselage nose installation is greater than that of a wing-tip installation but the variation of the error coefficient of lift is greater which uses a wing tip installation. So that the error correction in fuselage nose installation can be used accurately.
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For discussion of the vertical fin installation and fuselage vent installation we will provide it in the next post. Thanks for reading.