International Journal of Space Science and Engineering
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International Journal of Space Science and Engineering (2 papers in press)
Numerical study of flow over blunt bodies moving at supersonic speed by Devabrata Sahoo, Mohini U. Kamble, Kiran A. Dadhale Abstract: In the present study, shock waves produced over different blunt bodies moving at Mach 2.0 at zero angle of attack have been captured and analysed using computational investigations. Forebodies of distinct bluntness (hemisphere, ellipse, and ogive) are adopted, and the effect of the forebody geometry on the flow parameters is investigated. The flow parameters such as shock stand-off distance and shock strength have been captured over various forebody geometries and correlated with the forebody drag coefficient. With the reduction in the forebody bluntness, the shock stand-off distance and the shock strength are found to be decreasing, resulting in a decrease in the forebody drag coefficient values. The effect of the free-stream supersonic Mach number over a typical blunt body (hemisphere) was also investigated. With increasing freestream Mach number, the shock wave generated ahead the blunt hemisphere moved closer to the forebody and an increase in the forebody drag was observed. Keywords: supersonic; blunt bodies; drag reduction; shock stand-off distance. DOI: 10.1504/IJSPACESE.2021.10039595
Feasibility assessment of a small Earth observation satellite mission propelled with hydrogen peroxide system on a very low Earth orbit by Tomasz Noga, Tomasz Zawistowski, Adrian Parzybut, Maciej Kalarus Abstract: Earth observation (EO) is a popular mission objective of satellite systems. A typical optical EO satellite occupies a LEO orbit which allows to achieve resolutions required for their applications with optics that fits in a medium-sized bus. One of the alternatives is a small satellite with a propulsion module operating on a very low Earth orbit (VLEO.) While this approach has a number of challenges, it can result in small, low-price satellites capable of achieving resolutions comparable with standard EO satellites on LEO orbit. This paper describes the satellite platform that can potentially be used in the VLEO orbit. Image quality and observation instrument aspects as well as an impact of VLEO orbit on a mission design and its cost are discussed. Justification of a propulsion concept follows, and a parametric model of
propulsion module is described. A mission analysis estimating mission durations at VLEO is described and results are discussed. Keywords: very low Earth orbit; VLEO; Earth observation; propulsion; satellite; hydrogen peroxide; mission concept.