准稳定三波结构的研究

对超声速流中准稳定三波结构进行了研究,该结构中主激波以一定的速度D→沿超声速流运动,它不但引起相应的反射激波运动而且会使激波后气流中的一系列气动力参数发生变化,包括总压、总焓和熵等.本研究给出了这些量与入射激波强度之间的关系.在一定的速度D→的情况下,给出了三波结构的力学相容性条件是可以被破坏的.     

A Quasi-Spherical Air Pressure Probe

This paper considers an air pressure probe, the head part of which is made in the form of a polyhedron inscribed into a sphere. Wind tunnel testing of the probe models is performed, a mathematical model and an algorithm are constructed to calculate all the altitude and airspeed parameters, and an error estimation is given.     

Study of Dynamic Loads of Aircraft Bevel Gear Systems

This paper studies the dynamic loads of bevel gears with circular and straight teeth with the overlap factors less than two (ε_α < 2) and more than two (ε_α > 2). The advantages of the gears with straight teeth with ε_α > 2 are shown.     

Fuel atomization and mixing in unsteady swirling flows behind the gas-dynamic stabilizer

Features of fuel atomization and propagation in the flow behind a gas-dynamic stabilizer are considered. Estimations of the influence of transverse jets impulse magnitude on characteristics of mixing behind the stabilizer are obtained by numerical and experimental methods.     

Algorithms of Constructing the Regions of Initial States for Unmanned Winged Gliders

The algorithms of controlled descent for unmanned winged gliders are designed taking into account the requirements to the flight trajectory. The calculation results are represented to show the efficiency of the algorithms.     

Construction and algorithms of a helicopter air data system with aerometric and ion-tagging measurement channels

A functional diagram of the air data system and a structural scheme of the air data sensor are described. The special features of generating and processing the air data of aerometric and ion-tagging measurement channels at parking, takeoff and landing modes of the helicopter operation are examined.     

Application of a discrete-continuous model of strength analysis to solve the identification problem of a thermally loaded structure

This paper proposes to solve the problem of determining the strength properties of materials for thin-walled structural elements under mechanical and thermal loading as an optimization problem. A mathematical statement of the problem under certain assumptions is given.