CONTENTS #7 (July) 2022
Optimization of the Parameters of Tandem Configuration Orbits During Bistatic Interferometric Survey to Create a Digital Terrain Model (p. 3 – 14)
A.E. Nazarov, A.S. Petrov
Optimization tandem spacecraft orbits parameters used for conducting bistatic interferometric survey of the Earth's surface when creating a digital relief model is considered. As an indicator of efficiency, it is proposed to use the maximum possible error in determining the height of the relief, and as an optimality criterion – maximizing the duration of potential working zones on the turn, where the error in determining the height does not exceed the permissible value.
Keywords: tandem configuration; bistatic interferometric survey; effective baseline; positioning errors; relative motion trajectory; digital terrain model.
Noise of Jet Mainline Aircraft With Take-Off Mass Above 100 tonnes (p. 15 – 27)
V.G. Dmitriev, V.F. Samokhin, Yu.D. Khaletsky
The acoustic characteristics of modern mainline jet aircraft with a take-off mass over 100 tonnes are considered. An assessment of the degree of compliance of aircraft noise levels on the ground with the ICAO regulatory requirements is given. The maximum total reserves in reducing the noise levels of the mainline jet aircraft are established relative to the norms of chapter 3 of the ICAO standard for various ranges of take-off masses. For modern mainline jet aircraft in the approach mode, an assessment was made of the influence of the bypass degree of the turbofan engine on the ratio between the noise levels on the ground from the engine and from the airframe.
Keywords: jet aircraft noise; aircraft noise standards.
Research of Outflow from Swirl Injectors of a Liquid Rocket Engine on Fuel Components Kerosene and Liquid Oxygen (p. 28 – 35)
M.N. Senchev, I.A. Zubrilin, A.A. Didenko, V.O. Galitenko
The paper presents the results of the outflow processes of water and fuel components (kerosene T-1 GOST 10227–86 and liquid oxygen) from the swirl atomizer simulation in the liquid-propellant rocket engine, using the ANSYS Fluent software and an calculation of the according to Sauter mean diameter drops D 32.
Keywords: liquid rocket engine; swirl atomizer; kerosene; oxygen; atomization; droplet diameter.
Method of Computation of Start-up and Windmill Modes Using Elements-Based Nonlinear Quasi-1D Mathematical Models of Gas Turbine Engines (p. 36 – 44)
I.A. Leshchenko, M.Yu. Vovk, M.N. Burov
Method for compressor and turbine performance maps interpretation is presented, aimed at computing start-up and windmill modes of aircraft gas turbine engines with thermodynamic mathematical models. Work of the method is demonstrated by computing static modes of windmill and dry motoring applying to single-shaft turbojet.
Keywords: sub-idle; windmill, compressor performance map; turbine performance map.
The Dissipapative Amortization Structures (p. 45 – 54)
In the article the capability and efficiency of the unit assembly produced on the basis of the brunch of the nonlinear dynamics – the theory ot the dissipation to an acquisition and spreading of energy are shown. The the using of alternative physical effects for technics in the performance of application tasks of the space engineering is displayed.
Keywords: energy; reaction; entropy; dissipation; amortization; landing unit; spacecraft.