An aerosol shock tube has been developed for measuring the ignition delay times (tig) of aerosol mixtures of low-vapor-pressure fuels and for visualization of the auto-ignition flow-field.The aerosol mixture was formed in a premixing tank through an atomizing nozzle.Condensation and adsorption of suspended droplets were not observed significantly in Kudzu Root the premixing tank and test section.
A particle size analyzer was used to measure the Sauter mean diameter (SMD) of the aerosol droplets.Three pressure sensors and a photomultiplier were used to detect local pressure and OH emission respectively.Intensified charge-coupled device cameras were used to capture sequential images of the auto-ignition flow-field.
The results indicated that stable and uniform aerosol could be obtained by this kind of atomizing method and gas distribution system.The averaged SMD for droplets of toluene ranged from 2 to 5 μ m at pressures of 0.14−0.
19 MPa of dilute gases.In the case of a stoichiometric mixture of toluene/O2/N2, ignition delay times ranged from 77 to 1330 μs at pressures of 0.1−0.
3 MPa, temperatures of 1432−1716 K and equivalence ratios of 0.5−1.5.
The logarithm of ignition delay times was approximately linearly correlated to 1000/T.In contrast to the reference data, ignition delay times of aerosol COUNTRY CHEDDAR W PASTA BROCCOLI toluene/O2/N2 were generally larger.Sequential images of auto-ignition flow-field showed the features of flame from generation to propagation.