Construction of a mathematical model of a by-pass turbojet engine as part of a complex aircraft model of an on-board navigation system

Abstract

Abstract One of the main trends in the development of modern on-board navigation systems is aimed at increasing the predictability of the aircraft’s flight path in space and time. That in its turn should improve the accuracy of evaluation of fuel and operating costs, improving the quality dispatch services and bandwidth airspace. At the same time, the predictability of the trajectory can be an additional factor in ensuring the safety of flight operations. The current level of development of on-board computing systems allows to use the most effective method of forecasting - complex mathematical flight models for solving the problem of predicting a four-dimensional flight path and evaluating fuel costs. At the same time, a feature of the flight models implemented in on-board systems remains the orientation to minimize the computing resources used while ensuring the required accuracy of the estimation of the predicted parameters. One of the components of a complex mathematical model of flight is the engine model, which allows determining the fuel costs and energy capabilities of the aircraft. As one of the options for implementing the engine model as part of a complex mathematical model of the flight of an onboard navigation system, a mathematical description of the functioning model of a two-circuit turbojet engine is presented. For improving the accuracy of the parameter estimation, the model is built on the basis of thermogasdynamic calculation using a limited amount of initial data provided by the engine developer. The presented model of a by-pass turbojet engine provides the calculation of the main parameters of the engine operation, including fuel consumption and available thrust, at the specified values of the required thrust. And also, accordingly, determines the permissible operating modes of the engine when simulating operation as part of an aircraft. The results of the proposed model development are presented.