Accession Number:

AD0673822

Title:

SUPERSONIC FLOW OF A COMBUSTIBLE GAS MIXTURE OVER A SPHERE (SVERKHZVUKOVOE OBTEKANIE SFERY GORYUCHEI SMESYU GAZOV),

Descriptive Note:

Corporate Author:

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Report Date:

1967-08-18

Pagination or Media Count:

17.0

Abstract:

The flow with combustion in the detonation wave around a sphere or a semisphere attached to a cylinder was analyzed for cases where the detonation wave does not disintegrate, or disintegrates in the region with subsonic or supersonic velocity. In the latter case, the analysis did not present any difficulties. In the former case, which resembles the problem of a supersonic jet of finite width impinging on an obstacle, mathematical difficulties were experienced. The analysis was based on the assumption that an axisymmetric body placed in a supersonic stream generates a shock wave which ignites the mixture. The heat release at all points of the detonation wave is equal. First the subsonic and transonic and then the supersonic regions were calculated by methods developed for adiabatic flows. It is concluded that the problem has a unique solution which depends on the selection of the point where the detonation wave disintegrates. For a zero thickness detonation wave this point cannot be determined. At a sufficiently high heat release the detonation wave approaches the Chapman-Jouguet condition. Therefore, in cases when the detonation wave disintegration the point of disintegration will be located at a small distance from the solid surface. Author

Subject Categories:

  • Aerodynamics
  • Fluid Mechanics
  • Combustion and Ignition

Distribution Statement:

APPROVED FOR PUBLIC RELEASE