Published in Russian Aeronautics
AbstractA mass-economic assessment of replacement of aviation kerosene with cryogenic fuel is carried out based on the analysis of the mass sensitivity to the initial change in the aircraft parameters and on an example of transferring the Tu-204 aircraft to liquefied natural gas (Tu-206 project).
Published in Russian Aeronautics
AbstractIn this paper, the device for measuring the fluid pressure created by an impact is presented. The experimental results are presented that show the dependence of the force transferred by the fluid, which performs the pipe expansion, from the voltage on the capacitor.
Published in Russian Aeronautics
AbstractThe applicability of numerical methods based on the averaging the Navier–Stokes equations and the use of turbulence models, as well as eddy-resolving methods, under conditions of transition of a laminar flow to a turbulent one and formation of a separation bubble on the wing airfoil surface was studied.
Published in Russian Aeronautics
AbstractA mathematical model of laser cladding in a three-dimensional non-stationary approximation was developed, which makes it possible to consider the ultrasonic effect on the melt pool and the cladding layer during its solidification. The model equations are solved by the finite element method (strength) and finite volumes (heat and mass transf...
Published in Russian Aeronautics
AbstractThe paper presents the research results obtained on the basis of a technique that implements the finite element method for solving the problems of strength and stability of discrete-reinforced cylindrical shells made of the composite material, taking into account the momentness and nonlinearity of their subcritical stress-strain state. The ...
Published in Russian Aeronautics
AbstractMethods were developed for determining angular coordinates and location of radio emission sources by measurements of signal phase incursions in panoramic phase meter direction finders located on unmanned aerial vehicles. The accuracy of the methods is analyzed based on the results of the flight experiment.
Published in Russian Aeronautics
AbstractThe paper describes the experiments of study the comparative efficiency of air film heating of convex and concave surfaces using single-row bands with fan-shaped and cylindrical holes.
Published in Russian Aeronautics
AbstractThe paper considers several scenarios of parametric uncertainty influence on accuracy of system state vector components optimal estimation. The main attention in the simulation is paid to the analysis of the influence of this factor on estimation accuracy and convergence time. A large amount of simulation results on a complex object traject...
Published in Russian Aeronautics
AbstractThe paper presents the results of a numerical calculation of a liquid-liquid ejector with a curved initial section of the mixing chamber. The choice of geometric parameters of the ejector is substantiated to obtain a uniform profile of the liquid parameters at the outlet of the mixing chamber and to increase the relative pressure ratio.
Published in Russian Aeronautics
AbstractThe present paper addresses the problem of creating a dynamically and elastically scaled blade of a helicopter main rotor model. The issues of scaling the geometric, elastic and mass characteristics of the full-scale blade, are considered. A sequential design approach of constructing the structure section to attain the required elastic and ...
