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

Erwei Liu, Qin Liao and Shengli Xu
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Erwei Liu: School of Engineering Science, University of Science and Technology of China, Hefei 230026, China
Qin Liao: School of Engineering Science, University of Science and Technology of China, Hefei 230026, China
Shengli Xu: School of Aerospace Engineering, Tsinghua University, Beijing 100084, China

Energies, 2020, vol. 13, issue 3, 1-12

Abstract: An aerosol shock tube has been developed for measuring the ignition delay times ( t ig ) 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 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/O 2 /N 2 , 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 toluene/O 2 /N 2 were generally larger. Sequential images of auto-ignition flow-field showed the features of flame from generation to propagation.

Keywords: aerosol shock tube; ignition delay time; auto-ignition flow-field visualization (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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