Molecular back flow from the exhaust plume of a space-based laser
McCarty, Scott E.
Fuhs, Allen E.
MetadataShow full item record
Back flow from the exhaust of a chemical laser in low earth orbit may be detrimental to the integrity and operation of the self same system. Difficulties arise in the calculation of exhaust plume properties and molecular flux as the gas expands from continuum to free-molecular flow. The solution of the governing Boltzmann equation is exceedingly complex; similarly, numerical solutions such as the Direct Simulation Monte Carlo technique require prohibitive amounts of computer processing time. An alternate method of the assessment of molecular flux is presented in which the continuous transition from viscous to collisionless flow is approximated by a suitably defined breakdown surface. The molecular flux incident on a given area of the spacecraft surface is determined by integration of flux from all significant portions of the breakdown surface. Results are presented for exhaust plumes of various stagnation and exit plane conditions emanating from an axisymmetric ring nozzle.
Approved for public release; distribution is unlimited
NPS Report NumberNPS-67-85-003
Showing items related by title, author, creator and subject.
Falcovitz, Joseph (Monterey, California. Naval Postgraduate School, 1987-04); NPS72-87-003CRWe present a first-collision model for the evaluation of return flux from the exhaust plume of a ring- symmetric HF/DF laser in LEO, generated by an incident flux of ambient molecules traveling at orbital speed. The steady ...
Kutrieb, Joshua M. (Monterey, California. Naval Postgraduate School, 2001-12);Interest in accurate detection and targeting of aggressor missiles has received considerable interest with the national priority of developing a missile defense system. Understanding the thermal signatures of the exhaust ...
Development of naval diesel engine duty cycles for air exhaust emission environmental impact analysis. Markle, Stephen Paul. (Monterey, California. Naval Postgraduate School, 1994-05);A strategy for testing naval diesel engines for exhaust emissions was developed. A survey of existing international and national standard diesel engine duty cycles was conducted. All were found to be inadequate for testing and ...