THE RESISTANCE OF A FLAT PLATE LOCATED NORMAL TO THE FLOW OF GREATLY RAREFIED GAS (O SOPROTIVLENII PLOSKOI PLASTNYI, RASPOLOZHENNOI NORMALNO K POTOKU SILNO RAZREZHENNOGO GAZA)
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH
Pagination or Media Count:
A method is presented for calculating the aerodynamic properties of a flat plate of any given shape at arbitrary values of the accommodation coefficient in a rarefied gas flow. First-time collisions of free-stream and reflected molecules are considered, with the effect of attenuation of the reflected flow on free-stream flow taken into account. The presence of the arbitrary accommodation coefficient means that the velocity of a reflected molecule cannot be neglected at the time of collision with a free-stream molecule, and this leads to a complex collision integral. The method is based on calculating the function of the effect of molecules reflected from an elementary surface upon the aerodynamic characteristics of the other elementary surface. A detailed scheme for computer calculation by means of the Monte Carlo method was developed. The results of numerical calculations of the aerodynamic characteristics of a square plate for various values of the accommodation coefficient are presented as an illustrative example.
- Fluid Mechanics