By Kevin Keaveney

Aerofax Minigraph #15

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This effect, caused by offsetting of the center of gravity, gives a lift that is directly managed by controlling the roll using gas jets. This explains why the early reentry includes a resource (the object regains altitude, Fig. 5). The difficulties of the design problem in terms of material and experimental simulation can be illustrated as follows. 4, M ¼ 28:8 Á 10À3 kg Á moleÀ1 for air). This flow is calculated from a correlation derived from systematic parameterization (see Sec. 3d 6 (1:1) CHAPTER 1 Thermal Protection System Conception The coefficient a depends on the given atmosphere: • a ¼ 1:83 Â 10À4 kgÀ1=2 Á mÀ1 for air [10] • a ¼ 1:35 Â 10À4 kgÀ1=2 Á mÀ1 for Mars atmosphere [11] R is the radius of the object, and r is the density of air at the given altitude [1].

This effect is ignored in this book. Note, however, that some chemical kinetics data come from the interpretation of experiments where this effect is taken into account, inducing a problem of consistency. In severe cases, such as with shock waves, the internal degrees of freedom of the molecules are excited and their distribution is no longer described by a Boltzmann distribution, or, to a lesser level of complexity, it is described by a Boltzmann distribution different from that described by the translational temperature T of a Maxwellian distribution.

Braking is enhanced by a high incidence of the plane. Another method is to deploy a large structure [Inflatable Re-entry and Descent Technology (IRDT) or Inflatable Re-entry Vehicle Experiment (IRVE)] [13, 14] (see Fig. 9). This method has not yet passed the testing stage, however. The influence of the radius R also can be observed: the heat flux increases with decreasing radius (“small is difficult”). S. shuttle. , the first Mercury flights, the flight of the Fire II Apollo technology demonstrator), because of the good conductivity of these metals.

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