MOTION OF CAPSULE FOTINO ON THE ATMOSPHERIC SECTION OF THE REENTRY TRAJECTORY

Prof. Ivan Timbai

1. Motion of a center of mass of the capsule

             At a solving the factor of a drag force of the capsule  was determined under the formulas submitted Anton Ljaskin:

             at a flight altitude m:

,

            at m:

,

            at m:

             at a Mach number  (,  - a velocity of flight,  - a sound velocity),

             at ,

             at ,

             at ,

             at  and a Reynold's number ,

             at  and .

            The Reynold's number is determined by formula:

            ,

where  - diameter of the capsule,  - coefficient of viscosity which is determined by formula:

             at m,

             at m.

            Fig. 1 shows the relation of velocity head  to a flight altitude of the capsule, fig. 2 and fig. 3 - relation of a velocity of flight  to an altitude  for initial data:

(1) - m, m/s, an angle of inclination of a trajectory deg, m, mass of the capsule kg.

(2) - m, m/s, deg, m, kg.

(3) - m,  m/s, deg, m, kg.

(4) - m,  m/s, deg, m, kg.

(5) - m,  m/s, deg, m, kg.

(6) - m,  m/s, deg, m, kg.

 

 

 

 

2. Motion of the capsule about a center of mass

Fig. 4 shows the relation of a spatial angle of attack  to a flight altitude of the capsule , fig. 5 - relation of a velocity of change of a spatial angle of attack  to an altitude  for initial data: m,  m/s, deg, m, kg, factor of static stability m, longitudinal moment of inertia about a center of mass kg/m2, transversal moments of inertia about a center of mass kg/m2,  êã/ì2, initial value of a spatial angle of attack deg, initial value of transversal angular velocity , initial value of longitudinal angular velocity .

 

 

 

Fig. 6 shows the relation of a spatial angle of attack  to a flight altitude of the capsule , fig. 7 - relation of a velocity of change of a spatial angle of attack  to an altitude  for initial data: m, m/s, deg,  m, kg, m, kg/m2, kg/m2, kg/m2, deg, deg, .

 

 

 

 

 

 

Fig. 8 shows the relation of a spatial angle of attack  to a flight altitude of the capsule  for initial data: m,  m/s, deg,  m, kg, m, kg/m2, kg/m2, kg/m2, deg, , deg.

 

Fig. 9 shows the relation of a spatial angle of attack  to a flight altitude of the capsule  for initial data: m, m/s, deg, m, kg, m, kg/m2, kg/m2, kg/m2, deg, , .

 

 

Fig. 10 shows the relation of a spatial angle of attack  to a flight altitude of the capsule , fig. 11 - relation of a velocity of change of a spatial angle of attack  to an altitude  for initial data: m, m/s, deg, m, kg, m, kg/m2, kg/m2, kg/m2, deg, , .

 

 

Fig. 12 shows the relation of a spatial angle of attack  to a flight altitude of the capsule , fig. 13 - relation of a velocity of change of a spatial angle of attack  to an altitude  for a case when the capsule hovering in position of a unstable equilibrium deg and is in it up to the moment of reaching of an altitude m. The given case of motion is implemented at starting conditions: m, m/s, deg, m, kg, m, kg/m2, kg/m2, kg/m2, deg, deg, .