Particle Sizing in a Fuel-Rich Ramjet Combustor.
JOHNS HOPKINS UNIV LAUREL MD APPLIED PHYSICS LAB
Pagination or Media Count:
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 ms 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 ms, 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
- Numerical Mathematics
- Computer Programming and Software
- Combustion and Ignition