Binary alkali silicate glasses were synthesized as beads by aerodynamic levitation coupled to laser heating test the applicability of method this compositional range. While bubble-free lithium disilicate could be easily obtained, sodium and potassium silicates proved more challenging melt without significant evaporation: final samples contained bubbles exhibited drifts compared starting stoichi...

The need to increase the payload capacity of rockets motivates development high-power rocket engines. For a chemical propulsion system, this results in an increasing thermal load on structure, especially combustion chamber and nozzle must be able withstand extreme caused by high-temperature high-pressure gas. In order protect structure from effect heat flux, it is necessary counteract such with...

Mars Global Surveyor (MGS) successfully completed its rst phase of aerobraking in early 1998 and is the rst planetary mission to use aerobraking as a primary means of customizing its orbit to achieve its mission objectives [1]. The aerobraking requirements together with post-launch anomalies [2] presented a unique challenge to provide accurate predictions of the aerothermodynamic environment of...

Different types of Large Carbon Cluster (LCC) layers are synthesized by a single-step pyrolysis technique at various ratios of precursor mixture. The aim is to develop a fast responsive and stable thermal gauge based on a LCC layer which has relatively good electrical conduction in order to use it in the hypersonic flow field. The thermoelectric property of the LCC layer has been studied. It is...

The SUGAR Truss-Braced Wing (TBW) aircraft concept is a Boeing-developed N+3 aircraft configuration funded by NASA ARMD Fixed Wing Project. This future generation transport aircraft concept is designed to be aerodynamically efficient by employing a high aspect ratio wing design. The aspect ratio of the TBW is on the order of 14 which is significantly greater than those of current generation tra...

A review of the experimental and computational studies performed at NASA Langley Research Center (LaRC) to support the optimization and benchmarking of the hypersonic aerodynamic and aerothermodynamic databases for the X-33 vehicle is presented. A synoptic of the testing, computational, and analysis capabilities at LaRC applied to these studies is given. Analyses of the hypersonic aerodynamic c...

This report has been produced in order to address aerodynamic characteristics and stability and control issues relating to hypersonic vehicles that are deemed to be significantly different from those of the conventional (subsonic or supersonic) air vehicles. In particular we have addressed issues that are relevant to stability and control of hypersonic vehicles. This report should add to the ex...