The article is devoted to the mathematical modeling of a multifunctional air pressure probe for avionics systems. The stages of the preparation of mathematical models and their application for the study of the measuring device are considered, the error of the determining the altitude-velocity performance at various angles of attack of the airflow is calculated. Conclusions are drawn on the practical significance of the results obtained and the perspective for the development of mathematical models and their application for the development and study of aviation instruments. ANSYS CFX software was used for modeling and engineering calculations.

Keywords: air pressure probe, multifunctional air pressure probe, mathematical model of the air pressure probe, mathematical model of the multifunctional air pressure probe, air data system, altimetry, airspeed, angle of attack sensing, angle of sideslip sensing

The article presents the theoretical foundations of altimetry and measurement of airspeed and mathematical models of air pressure probes as part of air data system. The influence of external destabilizing factors, such as deformation of the flow near the aircraft fuselage due to action of Environmental Control System to functioning of aviation devices is considered. The calculation of the external flow around the fuselage of the aircraft to determine the pressure values at the installations locations of the air pressure probes. Applying the numerical research results and analytical methods, were calculated the values of altitude and registered calibrated airspeed for each air pressure probe. Conclusions are drawn about the effect of Environmental Control System for pressure perception by air pressure probe. ANSYS CFX software was used for modeling and engineering calculations of the external air flow around the aircraft fuselage.

Keywords: air pressure probe, static pressure receiver, artificial feel system pitot, mathematical model of the air pressure probe, environmental control system, air data system, altimetry, airspeed, ANSYS CFX, aerodynamic calculation