Analysis of Supersonic Axisymmetric Air Intake in Off-Design Mode

The most important issue in the design of a perspective aircraft is the development of a highly efficient power plant. One of the factors affecting its efficiency is the choice of air intake. The interest in this task is due to the fact that the operation of the air intake control program in various flight modes has a huge impact on the performance of the air intake device and, as a result, the power plant as a whole. The choice of the regulatory program is one of the most important types of work at the stage of forming the initial data when designing the power plants of aircraft (Bakulev et al. in Theory, calculation and design of aircraft engines and power plants, MAI, Moscow, 2013). The use of numerical modeling to solve various gas-dynamic problems allows us to expand the research range, and therefore, significantly reduce the number of experiments when practicing an air intake device. One of these tasks is to determine the characteristics of an air intake device in a wide range of flight speeds of aircraft. In this paper, we consider a supersonic axisymmetric three-shock air intake device of an external type of compression, numerical simulation of which was carried out in an application package for various operating modes. Based on the results of numerical modeling of the air intake device, a comparison is made to verify the design model, a solution is obtained to determine the optimum point for minimum losses in the off-design operation mode of the air intake device by changing the position of the central body without changing its geometry.