Mach 4 Performance of a Fixed-Geometry Hypersonic Inlet with Rectangular-to-Elliptical Shape Transition
Wind-tunnel testing of a hypersonic inlet with rectangular-to-elliptical shape transition has been conducted at Mach 4.0. These tests were performed to investigate the starting and back-pressure limits of this fixed-geometry inlet at conditions well below the Mach 5.7 design point. Results showed that the inlet required side spillage holes in order to self-start at Mach 4.0. Once started, the inlet generated a compression ratio of 12.6, captured almost 80% of available air and withstood a back-pressure ratio of 30.3 relative to tunnel static pressure. The spillage penalty for self-starting was estimated to be 4% of available air. These experimental results, along with previous experimental results at Mach 6.2 (Smart, M.K, “Experimental Testing of a Hypersonic Inlet with Rectangular-to-Elliptical Shape Transition”, Journal of Propulsion and Power, Vol. 17, No. 2, pp 276-283, 2001)indicate that fixed-geometry inlets with rectangular-toelliptical shape transition are a viable configuration for airframe-integrated scramjets that operate over a significant Mach number range.
Study of performance of supersonic axisymmetric mixed-compression multi-inlets under single subcritical condition
This paper proposes a method to make supersonic axisymmetric mixed-compression multi-inlets get into the single subcritical condition by numerical simulation. The flow mechanism in the inlets and the changing rule of the aerodynamic performance of the missile under this condition have been studied. The results when supersonic inlets get into single subcritical condition are concluded as follows: (1) the backpressure in the inlets is high, the flow velocity is subsonic; (2) the flow flux of the missile reduces and the drag coefficient increases at the same time. About 1% of the loss of the flow flux can result in about 2% of the addition of the zero resistance; (3) the lift coefficient of the missile remains unchanged basically; (4)the value and the slope of the pitching moment coefficient are both increasing, the longitudinal static stability of the missile increases 1.57% maximum; (5) the missile produces a large yaw moment, and the value increases as the angle of attack increases.
Production of new antituberculosis drug and other medical preparations by electron beam treatment
Abstract Possibility of electron beam usage for immobilization of hydrazidum of an isonicotinic acid (HIA) on dextrane was studied to produce a drug for treatment of a tuberculosis. As a result of irradiation of dextrane the processes of oxidation and formation of polysaccharide occur due to carbonyl groups which are to link isoniasidum. The HIA immobilized on dextrane may be used as an effective medical preparation having prolonged action for action on endo and extracellular population of Micobacterium tuberculosis .