Accession Number : AD0877901

Title :   Development and Evaluation of a Flight Attenuation Model.

Descriptive Note : Quarterly progress rept. no. 1, 27 Mar-27 Jun 70,

Corporate Author : BRIGHAM YOUNG UNIV PROVO UTAH

Personal Author(s) : Smoot,L. Douglas

Report Date : NOV 1970

Pagination or Media Count : 29

Abstract : The objective of this study is to develop a theoretical model for predicting flight attenuation caused by rocket exhaust plumes, with emphasis on exhaust plume structure, including base-recirculation effects. During the first quarter, an approach to model development was outlined and seven separate plume regions were identified. A review of the literature pertinent to each region was initiated. From available work, a composite plume structure, referred to as model (A), was formulated and computerized. Development of methods for improving this initial model were initiated, with emphasis on axisymmetric geometry effects and axial pressure gradient. Plume-microwave signal interference effects were briefly investigated in the framework of a composite antenna composed of the physical antenna, the missile, and the plume. A possible interference model for this antenna system was identified. Work during the second quarter will include completion, evaluation, and extension of plume structure model (A), which was developed during first quarter. (Author)

Descriptors :   (*RADAR CROSS SECTIONS, ATTENUATION), (*EXHAUST FLAMES, GUIDED MISSILE DETECTION), (*SOLID PROPELLANT ROCKET ENGINES, EXHAUST FLAMES), MATHEMATICAL MODELS, AFTERBURNING, BLACKOUT(PROPAGATION), SUPERSONIC FLOW, EXPERIMENTAL DATA

Subject Categories : Active & Passive Radar Detection & Equipment
      Combustion and Ignition
      Solid Rocket Propellants

Distribution Statement : APPROVED FOR PUBLIC RELEASE