Aerosol Shock Tube Designed for Ignition Delay Time Measurements of Low-Vapor-Pressure Fuels and Auto-Ignition Flow-Field Visualization

Aerosol Shock Tube Designed for Ignition Delay Time Measurements of Low-Vapor-Pressure Fuels and Auto-Ignition Flow-Field Visualization

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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 new belial model through an atomizing nozzle.Condensation and adsorption of suspended droplets were not observed significantly in 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 majicontrast red 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 toluene/O2/N2 were generally larger.Sequential images of auto-ignition flow-field showed the features of flame from generation to propagation.