Supersonic Part Of Nozzle Research Articles

Application of detonation in impulse systems of energy engineering and mining industry

Nowadays the demand for energy needs is constantly growing. Given the fact that most of this demand is provided by non-renewable energy sources, another way of development remains relevant is more efficient use of available resources. One of the areas of effective energy use is swapping deflagration combustion to the detonation process. Due to the rapidity of the detonation, the entropy of the reaction products is lower than that of deflagration combustion. In addition, there are only “fast” reactions, so the molar mass of the products is the minimum possible for a specific fuel mixture. The article considers a special case of the application of the detonation process in a new way of control the thrust vector of rocket engines, shows its effectiveness and features of use. Numerical modeling of the injection of detonation products into the supersonic part of nozzle at different angles was carried out, and the change in relative lateral force over time was determined for each case. It is shown that the control system with discrete control pulses can be used to maneuver the upper stage of the rocket and to destroy hard mineral rocks, to compact soils and materials in compressed conditions.

Control of spray spot shape in cold spray technology. Part 2. Spraying process

The present paper studies high-velocity heterogeneous flows produced with nozzle designs unconventional for cold spray; the process of coating deposition was studied under these conditions. The possibility of using unconventional gas dynamic tools (swirling of main flow, nozzles with permeable profiles and with slots in the supersonic part of nozzle) for control of particle distribution in the supersonic jet is investigated: this might be useful for obtaining a proper shape of the spray spot. These experiments offered a method of gas-dynamic design for the spray spot shape, which extends the possibilities of cold spray technique.

Large-Scale Streamwise Vortices in the Supersonic Part of a Permeable Nozzle

Large-scale streamwise vortices in the vicinity of a perforated wall in the supersonic part of the nozzle are studied. The governing effect of gas inflow through a perforated wall on origination and parameters of streamwise vortices is experimentally established.