A series of supersonic wind tunnel tests on an ogive-cylinder body were performed to investigate the pressure distribution, the boundary layer profiles, and the flow visualization at various angles of attack. All tests were conducted in the trisonic wind tunnel of the Imam Hossein University. The theoretical shock angle at different model positions compared well with those we obtained via Schi...

The temporal characteristics of the polar wind were studied with both a full set of hydrodynamic equations and a simplified set of collisionless equations. The hydrodynamic set contained continuity, momentum and energy equations for H +, O+ and electrons, including collisional conductivities and variable, but isotropic, ion and electron temperatures. The collisionless model included the same sp...

In this paper an upwind algorithm based on Roe’s scheme is presented for solution of PNS equations. Non iterative-implicit method using finite volume technique is used. The main advantage of this approach, in comparison with similar upwind methods, is reduction of oscillations around sonic line. This advantage causes the present method to be able to analyze supersonic flows with free stream Mac...

Air flows with supersonic speeds are used in many cases, for example, as aircraft air intakes, wind tunnels, and energy separation devices. In cases it is necessary to decelerate the flow sonic speeds. Traditionally deceleration realized through shocks system, which leads total pressure losses. The article considers method of using permeable surfaces. this case, process occurs without and, ther...