CONTROL OF THE FORMATION OF A TRANSONIC REGION IN AN AXISYMMETRIC SUPERSONIC FLOW WITH THE USE OF A JET AND A NEAR-WALL ENERGY SUPPLY

The control action of a throttling air jet produced by a gas generator and of the energy sources positioned at the walls of an axisymmetric channel, which models the combustion-chamber unit of a ramjet in which a gas fl ow is decelerated, on the shock-wave structure of a supersonic gas fl ow in the channel was investigated for the purpose of formation of a lengthy transonic region in it. A heat energy was supplied to the gas fl ow in the indicated channel in the pulse-periodic regime, and the pressure in the gas generator was also changed periodically. The range of energies corresponding to a stable transonic fl ow regime in the channel was determined on the basis of solution of the nonstationary Euler equations in dimensionless variables. For comparison, the combustion of a gaseous fuel infl owing to the channel through a slot in the channel wall upstream of the control air jet was considered. A nonstationary gas fl ow in the channel was calculated on the basis of the Reynolds-averaged Navier–Stokes equations with the use of the k–ω SST model of turbulence. It is shown that a controllable energy release in the channel, providing the obtaining of a transonic fl ow regime in it analogous to that obtained on the basis of solution of the Euler equations, can be realized with the use of a control transverse air jet
   
Author:  V. P. Zamuraev and A. P. Kalinina
Keywords:  supersonic fl ow, axisymmetric channel, near-wall energy sources, control jet, Euler and Navier–Stokes equations
Page:  136