I. L. Mostinskii

Physical basics of turbulent gas combustion

We present a survey of a large amount of experimental data on the problem of jet-flame flow of combustible gases into a submerged space filled with air. We show that the defining similarity criteria are the Reynolds number and the scale factor calculated using the initial parameters of the outflowing fuel jet. Turbulent viscosity of the jet with and without combustion is calculated based on the results of measurement measuring the pulsation components of velocity.

Experimental investigation of processes of melting-solidification of heat storage materials

Description is given of the test bed and experimental procedure for studying the processes of melting-solidification of heat storage materials (HSM). Experimental data are given, obtained under conditions of melting of cylindrical samples of four HSMs heated from above, namely, paraffin, lauric and stearic fatty acids, and trihydric sodium acetate. Based on the results of theoretical investigations, a calculation formula is suggested which exhibits good agreement with experiment.

Problems of and Prospects for the Investigation of the Thermal Conditions of Blades of High-Temperature Gas Turbines (a Review Based on Presentations to the Third Russian National Conference on Heat Transfer)

Experimental and theoretical analytical studies are reviewed which are devoted to the problems of cooling blades of high-temperature gas turbines and were reported at the Third Russian National Conference on Heat Transfer. The thermal conditions of the external surface of blades with internal convection cooling were investigated in experimental test stands and in the operating GTE-150 facility. The mathematical simulation was reported in a large number of presentations, many of which involved the use of the latest commercially available computer codes of the type of STAR-CD, FLUENT, and others. Special attention is given to studies into the heat transfer and hydrodynamics under conditions of convection-film cooling of blades and of most advanced penetration porous cooling of hot stages of gas-turbine plants.

Heat transfer from a surface with spherical hollows in boiling of water and a steam-water mixture in the supercritical region

The authors carried out an experimental investigation of heat transfer in the supercritical zone in flow of water and a steam‐water mixture in a vertical annular channel. The interior wall heated by the current was either smooth or with hollows stamped in a straight‐line order. The application of them increased the heat‐transfer coefficient by a factor of 1.5–2 and more. The increase in the frictional resistance was much smaller.

Enhancement of Heat Transfer to a Steam-Water Mixture in the Postcritical Region with the Aid of Spherical Cavities

The paper describes the experimental stand and the procedure for investigation of heat transfer from a surface with spherical cavities under conditions of boiling of water in the postcritical region. The experimental section is provided by a 14/10 mm round channel 590 mm long, whose replaceable inner pipe is smooth or covered with spherical cavities 3.8 mm in diameter and 1.0 mm deep. The arrangement of cavities is in-line, with a longitudinal step of 6 mm and a transverse step of 6.3 mm. Experiments are performed at a mass velocity ranging from 300 to 500 kg/(m2 s) and a pressure of 17.7 and 21.7 MPa in a wide range of relative enthalpy. The results of comparison of the values of heat-transfer coefficient α for a surface with cavities with the values of α for a smooth surface (obtained by us and other researchers) reveal a considerable enhancement of heat transfer thanks to cavities: an increase in α by a factor of 1.5–4 and a decrease in the pipe wall temperature by 100–200 K.

Distribution of the disperse fraction of an injected polydisperse jet in a gas flow

The distribution of a polydisperse droplet jet over a gas flow is theoretically investigated. Results are given for specific nozzles.