Hot Wire Measurements of Temperature Field Structure within GEST Fireballs.
Abstract
Using stationary rakes of hot wire anemometer probes, a series of temperature measurements have been conducted within rising fireballs created by detonation of large-diameter, gas-filled balloons. These nuclear simulation tests were performed under DNA's GEST Program at the SANDIA Laboratories Aerial Cable Test Facility, Kirtland AFB, during the late fall of 1973 and early January of 1974. All measurements were performed after pressure equilibrium (t greater than 1 sec) but prior to completion of the toroid formation process and within the time required (t less than 4 sec) for the fireball to rise one diameter. Although 70 channels of measurment were activated during the course of the investigation (8 events), fireball data return was partially limited by such factors as wind-induced fireball drift, sensor failure due to balloon debris motion, and signal saturation phenomena. Based on an extensive processing of measured data for two single 10 m diameter balloon events (MB-3 and MB-4) unique results describing the mean flow field and turbulent structure statistics for the early-time large-scale fireball have been determined. Mean convection velocities for the fireball wake were measured to be approximately twice as large as fireball rise velocities (43 ft/sec).
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 31, 1976
- Accession Number
- ADA033738
Entities
People
- Richard G. Batt
Organizations
- TRW Inc.