Ignition Delay in Solid-Fuel Ramjet Combustor

The ignition delay requirement and ignition characteristics of a solid fuel in the ramjet combustor were investigated. The shock in a simple diffuser geometry was calculated to obtain the upper limit of ignition delay, and it was determined to be shorter than 1 s. To achieve this short ignition dela...

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Bibliographic Details
Published in:Journal of propulsion and power 2018-11, Vol.34 (6), p.1519-1528
Main Authors: Jung, Woosuk, Jung, Sangwoo, Kwon, Taesoo, Park, Juhyeon, Kwon, Sejin
Format: Article
Language:English
Subjects:
Ammonium perchlorates
Boron
Cellulose esters
Cellulose nitrate
Combustion chambers
Composite propellants
Delay
Diffusers
Gas generators
High density polyethylenes
HTPB propellants
Ignition
Propellant tests
Ramjet engines
Solid fuels
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Summary:The ignition delay requirement and ignition characteristics of a solid fuel in the ramjet combustor were investigated. The shock in a simple diffuser geometry was calculated to obtain the upper limit of ignition delay, and it was determined to be shorter than 1 s. To achieve this short ignition delay, a high-density polyethylene (HDPE) fuel grain coated with an ignition support material and a fuel-rich propellant (FRP) were prepared. The ignition support materials were nitrocellulose with boron potassium nitrate (NC/BKNO3) and an ammonium perchlorate (AP)/hydroxyl-terminated polybutadiene (HTPB)-based composite propellant. For testing purposes, a compact gas generator was built to simulate the conditions in the ramjet combustor. The simulation results revealed that the NC/BKNO3 ignition support material showed the shortest ignition delay of 1.27 s, but the flame in this case was not sufficient to ignite the HDPE. In a demonstration test, an ignition support material composed of NC/BKNO3 and the AP/HTPB-based composite propellant was applied to the FRP fuel grain, in which case a stably sustained flame was obtained. The test results demonstrated that ignition of the FRP and that of the ignition support material occurred simultaneously with an ignition delay of 1.74 s.
ISSN:0748-4658
1533-3876
DOI:10.2514/1.B36955