Accession Number : ADA135632

Title :   Particle Sizing in a Fuel-Rich Ramjet Combustor.

Descriptive Note : Technical memo.,

Corporate Author : JOHNS HOPKINS UNIV LAUREL MD APPLIED PHYSICS LAB

Personal Author(s) : Turner,R ; Murphy,R A

PDF Url : ADA135632

Report Date : Aug 1983

Pagination or Media Count : 103

Abstract : A laser Doppler velocimeter (LDV) has been used to measure the size, concentration, and velocity of individual particles having diameters ranging from 3 to greater than 100 micron and having velocities of 600 to 1400 m/s in the fuel-rich exhaust of a ramjet combustor. The visibility of the LDV output was used to measure particle diameters ranging from 3 to under 30 micron and the mean scattered amplitude was used to measure particles ranging from 20 to over 100 micron. The attenuation of one LDV beam provided information on the total amount of material present. Measurements were made along the flow field of a combustor operating at 35 psia, an inlet temperature of 650 to 850 K, and fuel equivalence ratios (ER) of 1.6 and 2.6. Typically, at a point one-half inch from the nozzle and for an ER of 2.6, the average particle velocity is 800 m/s, the average particle size is 50 micron, and the particle density is 250 particles per cubic centimeter. The large particles appear to be unburnt fuel. (Author)

Descriptors :   *Computations, *Computer programs, *Particle size, *Combustors, *Ramjet engines, Measurement, Laser velocimeters, Doppler systems, Fortran, Flow fields, Inlets, Temperature, Density, Visibility, Calibration

Subject Categories : Numerical Mathematics
      Computer Programming and Software
      Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE