Accession Number:

AD0842055

Title:

ADVANCED PENETRATION PROBLEMS. EXOTHERMIC ADDITIVES FOR WAKE MODIFICATION

Descriptive Note:

Semiannual progress rept. 16 Oct 1967-15 Apr 1968

Corporate Author:

PHILCO-FORD CORP NEWPORT BEACH CA SPACE AND RE-ENTRY SYSTEMS DIV

Personal Author(s):

Report Date:

1968-05-15

Pagination or Media Count:

101.0

Abstract:

The progress achieved in the first four and one-half months of the program was reviewed. The principal effort of this period has consisted of the design of experiments for demonstrating the effect of exothermic energy release on turbulent flow structure, the development of sensitive instrumentation for the accurate measurement of both time-average and fluctuating scalar quantities temperature and concentration, the development of techniques for reducing the raw data derived from the sensors and their associated electronics to forms suitable for correlation and analysis, and the completion of several experiments in both nonreacting and nonequilibrium reacting gases. Calculations of the effectiveness parameter for the NO2 reacting system have shown that the recombining NO2 system to form N2O4 will exhibit a sufficiently large effectiveness parameter under laboratory conditions so that the turbulence in a wake flow should be significantly modified. Appropriate experiments for demonstrating this effect were designed. An improved fiber optic probe was developed for use in the heated reacting gases T to 800 K, P to 10 atm. Several experiments were completed with both high temperature air and reacting NO2. Both total rms and spectral data were obtained. In the case of heated fully developed turbulent tube flow, the temperature and concentration intensities were found to be an order of magnitude higher in the nonequilibrium reacting gas than in nonreacting air.

Subject Categories:

  • Test Facilities, Equipment and Methods
  • Guided Missiles
  • Spacecraft Trajectories and Reentry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE