Aeronautical Engineering

Atmospheric Re-Entry Vehicle Mechanics by Patrick Gallais

By Patrick Gallais

Based on a protracted engineering event, this booklet bargains a accomplished and cutting-edge research of aerodynamic and flight mechanic access themes. This up to date variation had new chapters on Re-entry on Mars undertaking, flight caliber, rarefied aerodynamics and re-entry accuracy. furthermore, it presents a wide set of software workouts and solutions.

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4. 3 Continuous Mode In continuous flow, we must examine the dependence on variable M∞ , Re∞ , α . The problem is to model the aerodynamic coefficients in the “flight parameter’s map” characteristic of the missions of the vehicle. Three methods may be employed. 1 Experimental This primarily consists in measuring aerodynamic effects on a model in a wind tunnel. The Mach conditions are difficult to achieve along with viscous effects related to the Reynolds number (turbulent flow) and with surface conditions representative of flight.

Like the earth’s atmosphere, the Martian mean atmosphere is function of the latitude and longitude, and it evolves according to location relating to the sun during the Martian year, which corresponds to 24 terrestrial months. The absence of liquid water simplifies heat exchange and modeling of general heat/fluid circulation in the atmosphere, thus allowing prediction of mean values of parameters and dispersions. However, the atmosphere is subjected to violent winds and dust storms that strongly modify the temperature and density profiles compared to the mean model.

01 (Depending on mesh) ◦ –35◦ (Depending on geometry, Mach number, and on the method used to solve subsonic flow at stagnation point) Not applicable in the case of a separated flow - “Exact” methods have been developed to solve Navier–Stokes equations or “parabolized” Navier–Stokes equations (case of steady state flows, in supersonic zone)[AND] . The laminar flow solution is theoretically well formulated; however, the turbulent flow solution is less satisfactory and relies on models based on experimental results.

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