Numerical simulation of a flow around airfoil using inviscid gas equations

A method for determining a field of inviscid gas equation application in finding the aerodynamic characteristics of bodies is proposed; as an example, use is made of airfoils for which extensive experimental data are available. The comparative analysis of physical and numerical simulation results showed a good verification of the method presented.     

Identification and management of risks at introduction of new products into manufacture

A process of overall risk management when organizing manufacture of new products is considered. A number of factors that exert an influence upon the deviation of finance indicators from the planned ones are revealed. Also described are the techniques for levelling of the influence of these factors and attaining least deviations from planned finance indicators.     

Theory of longitude librations of mercury based on the ground radar observations

On the basis of the analytic theory of longitude libration of Mercury (in the elliptical orbit) and the data of determination of values of the angular velocity of Mercury rotation obtained using high-precision complex method of ground radar tracking, the amplitude, phase, and period of free libration and amplitudes of five fundamental harmonics (annual, semi-annual, third annual, …) of forced librations in longitude of the planet are determined.     

Electrification of a rocket during its launch and motion in the atmosphere along active part of the trajectory

We studied the process of electrification of a rocket during launch and flight in the atmosphere at the active part of its trajectory. The values of charge, field strength, and rocket potential at the launch are estimated. Charging and discharging currents are determined for a rocket flying through clouds and precipitation, and solutions expressing the time variation of the rocket’s charge are found. The values of charge, field strength, and rocket potential are obtained as functions of time, together with the engine plume represented as a charged plasma structure. The rocket’s charge is shown to tend to an equilibrium state, and the time of reaching it is found. Mechanisms limiting the charge value are considered, and the conditions of origination of an electric breakdown (lightning) between the rocket and atmosphere are determined.     

Study of tracer generator performance in ionic tracer systems for flight parameter measurement

The features of ionic tracer systems for flight altitude and speed parameter measurement are considered. The variants of ionic tracer generators, their models and characteristics, results of experimental study of the base type are presented.     

An efficient method for determining a distance at direction finding of target with partially-known parameters

An efficient method for determining the slant distance from a rectilinearly moving target by two bearing measurements is described using a priori information about the probable magnitude of velocity, acceleration, and others. Also given are the assessment of method effectiveness and an illustrative example.     

Shaping a SPRE multinozzle cluster with out-of-round nozzles

A method for shaping a supersonic part of a compact multinozzle cluster of a solid propellant rocket engine (SPRE) with out-of-round nozzles integrated into the common bell mouth is proposed. Also presented is an approach to evaluation of basic components of the total thrust impulse losses.     

Arrangement of a spacecraft-borne scientific instrument container in the passing experiment

A solution of a problem on the attached mass arrangement aboard a flight vehicle as a scientific instrument container or a small satellite in the passing experiment is considered.     

Processing the data of measurements of angular velocity and microaccelerations onboard the <Emphasis Type="Italic">Foton-12</Emphasis> satellite

The results of reconstruction of uncontrolled rotational motion of the Foton-12 satellite using the measurement data of onboard sensors are presented. This problem has already been solved successfully several years ago. The satellite motion was reconstructed using the data of measuring the Earth’s magnetic field. The data of measuring the angular velocity and microaccelerations by the QSAM system were actually not used for this purpose, since these data include a clearly seen additional component whose origin was at that time unclear. This component prevented one from using these data directly for reconstruction of the angular motion. Later it became clear that the additional component was caused by the Earth’s magnetic field. Discovery of this fact allowed us to make necessary corrections when processing the QSAM system data and to use them for reconstruction of rotational motion of Foton-12. Below, a modified method of processing the QSAM system data is described together with the results of its application. The main result is obtained by comparing the motion reconstructed from measurements of angular velocity or acceleration with that found by way of processing the measurements of the Earth’s magnetic field. Their coincidence turned out to be rather accurate.