Numerical analysis of the coefficients of temperature restitution and heat transfer in high-speed flows

A technique for numerical calculations of the coefficients of temperature restitution and heat transfer on the surface streamlined by a high-speed constant-composition flow is suggested. The data obtained in the course of numerical studies of local coefficients of temperature restitution and heat transfer on this surface in the presence and absence of the longitudinal pressure gradient are given. The nonmonotonic variation of the coefficient of restitution along the streamlined surface length is established. We are the first who succeeded in obtaining the data on influence of both the adverse and accelerating longitudinal pressure gradients upon the coefficients of temperature restitution and heat transfer in a high-speed turbulent gas flow. Also obtained are some data on the influence of inaccurate determination of restitution coefficients upon heat transfer.     

Selection of force parameters of intermolecular interaction potential for a number of individual gases at high temperatures

Making use of the Boltzmann kinetic equation, an approach to a more accurate calculation of transport coefficients is considered; the approach is based on the modification of the Lennard-Jones potential and efficient numerical algorithm for calculating the Ω-integrals. The calculation data on the transport coefficients are compared with the experimental data obtained by other researchers.     

Calculation of fuel distribution in the combustion chamber front device equipped with a three-stage swirler

The results of calculating a flow and concentrations of droplet-liquid and vaporous fuel in the combustion chamber injector module are presented. The numerical model used takes into account polydispersity of a fuel flame and a multistage nature of fuel atomization. A significant influence of the swirler design on the fuel droplet deposition on the module walls and distribution of droplet-liquid and vaporous fuel concentrations is revealed.     

To development of air heat pumps for operating in Russian climate

The air heat pump (HP) driven from GTP, created on the basis of aircraft GTE removed from service, is considered. The heat pump uses ambient air from negative (?40 °C) to positive (+15 °C) temperature values as a low-grade heat source and provides heating temperature in a range from 100 to 250 °C with the performance factor 2.5–3.2. The high technological burning of gas decreases its consumption for heating on the average by a factor of 1.5 in comparison with an ordinary boiler-house. Cold HP exhaust within the range of ? 50 … ? 80 °C is fed both to a drive GTP and an integrated electric energy generating GTP, this increasing their specific power by a factor of 1.2–1.4 and efficiency up to a factor of 1.05–1.1. In standard HPs designed for operation with low-grade heat sources from +5 to +10°C, the heating temperature does not exceed +60 … +65 °C for the performance factors indicated.     

An approach to the solution of a balancing problem for the S.S. Balandin kinematic free piston scheme by applying a new scheme with a forked rod

A problem of the S.S. Balandin free piston scheme unbalance is considered and a variant of complete balancing with the use of the developed scheme with a forked rod is proposed. Experience in the development of an experimental specimen made according to a new scheme with the use of a forked rod is described.     

Ionospheric disturbances in the north-east region of Russia according to ionosonde data in the periods of equinoxes

Ionospheric disturbances in the equinox periods of 2005–2006 are considered on the basis of the ionosondes of vertical and oblique sounding located in the north-east region of Russia. It is found that the X-ray flares observed in the first half of September 2005 caused an additional increase in the ionization of the lower ionosphere in the daytime, this fact leading to a development of absorption and an increase in the lowest observable frequencies at the Magadan-Irkutsk and Noril’sk-Irkutsk radio paths. Wave-like changes in the maximum observable frequencies and critical frequencies with periods of about 2–2.5 h were detected during the magnetic disturbances. Oscillations of the planetary wave type with periods of 4–5 days were also revealed.     

Heat transfer in annular channels with flow twisting

The results of the experimental study of heat transfer in one-and two-phase regions at a pressure p = (98–103)10⁵ Pa in annular channels with twisting by means of a wire spiral and two-way heat supply are presented. We consider problems of determining the boiling point temperatures and heat transfer intensity at convection and boiling on convex and concave surfaces of an annular channel with twisting.     

Observations of the auroral hectometric radio emission onboard the <Emphasis Type="Italic">INTERBALL-1</Emphasis> satellite

The results of five-year (1995–2000) continuous observations of the auroral radio emission (ARE) in the hectometric wavelength range on the high-apogee INTERBALL-1 satellite are presented. Short intense bursts of the auroral hectometric radio emission (AHR) were observed at frequencies of 1463 and 1501 kHz. The bursts were observed predominantly at times when the terrestrial magnetosphere was undisturbed (in the quiet Sun period), and their number decreased rapidly with increasing solar activity. The bursts demonstrated seasonal dependence in the Northern and Southern hemispheres (dominating in the autumn-winter period). Their appearance probably depends on the observation time (UT). A qualitative explanation of the AHR peculiarities is given.