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Manuilovich S.V.,Zhukovskii Central Aerohydrodynamic Institute
Doklady Physics

The main cause of the turbulent flow character in the boundary layer on a wing of a modern airplane is the wing sweep. The flow acceleration in the vicinity of the leading edge and the sliding effect lead to the formation of cross flow in the boundary layer, namely the air motion along the wing surface in the direction perpendicular to the external flow velocity. The optimal configuration of the force effect can be used when designing the system of actuators for cross flow cancellation in the boundary layer on a swept wing. The solid and dashed lines denote the cases of the force effect and its absence, respectively. In the absence of the effect, the thickness of the boundary layer increases monotonically. The applied force leads to considerable thickening of the boundary layer in the vicinity of the attachment line. Then the thickness of the boundary layer decreases and turns out to be almost equal to the thickness in the absence of the effect. Source

Zaveryukha G.G.,Zhukovskii Central Aerohydrodynamic Institute
Russian Engineering Research

The fatigue life of structural elements in multiaxial loading may be assessed on the basis of the balance of fatigue strength, taking account of the change in stress-strain state in multiaxial and uniaxial loading. © 2010 Allerton Press, Inc. Source

Molleson G.V.,Zhukovskii Central Aerohydrodynamic Institute | Stasenko A.L.,Moscow Institute of Physics and Technology
High Temperature

In continuing studies [1–4] in which optics and electrification of particles colliding with a body around which a high-speed two-phase jet flows are considered, there was an attempt to explain the experimentally observed luminescence [5] of a conducting body, bombarded by microparticles, by the presence of a reverse unipolar current (from rebounded particles) exciting carrier-gas molecules. The process of charge acquisition by a particle in collision with a solid is complex: not only the value of the charge but even its sign are unknown in many cases [6]. A simple model is proposed for estimating the characteristic values of the reverse current density and the spatial distribution of the gas luminescence energy. © 2015, Pleiades Publishing, Ltd. Source

Kucherov A.N.,Zhukovskii Central Aerohydrodynamic Institute
Technical Physics

A crisis caused by an external force (deceleration of the flow down to the radial Mach number equal to unity) is studied in the regime of vortex source flowing into vacuum. The dependences of the critical characteristics (critical radius, temperature, and velocity) on the gas circulation Γ is studied in two situations: at a constant external force distribution function and at a constant pressure in the zone of action of the force. It is shown that the adiabatic relation between the pressure, temperature, and density is valid. Explicit analytic solutions inside the zone for Γ = 0 and implicit solutions for Γ > 0 are obtained. In the case of a uniform distribution of the external force, it is found that the effect of the integral of force (work) on the critical characteristics dominates and is independent of the initial parameters (zone coordinate, temperature at the inlet, etc.). In the case of constant pressure, the regions of realization of the crisis in the space of the similarity numbers (force, circulation, and initial coordinate and temperature) are plotted. © 2015, Pleiades Publishing, Ltd. Source

A study was conducted to demonstrate analytical solutions and singularities of evolution equations of the orbit of a spacecraft under the action of small forces. Adequate asymptotic forms were proposed for solutions entering into the composition, leading to a sufficient accuracy of the analytic representation of the general solution describing that a multiturn spacecraft (SC) trajectory was reached. The practical application of an algorithm showed that the satisfactory accuracy was reached in the second approximation when n + 1 = 2. The possibility of the obtainment of the analytical representation that was sufficiently accurate at the change of φ in the interval of the order of 1/ε in the whole smallness region of perturbation terms and single for values of eccentricity less than unity up to zero was shown for the general solution as a result. Source

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