Title: Shock Train Position Control in an Axisymmetric Scramjet Combustor Flowpath
Abstract: This initial evaluation of the sum-of-pressures (SUM-P) algorithm appears in a hydrocarbon-fueled direct-connect scramjet combustor appears to have been effective. Using a series of existing 1-Hz isolator pressure taps as inputs to a simple control algorithm permitted the monitoring and placement of the pre-combustion shock train at specified axial locations within the isolator of an axisymmetric scramjet combustor. Typical simulated flight conditions were Mach 4 and a dynamic pressure of 1000 psf. The SUM-P algorithm was able to complete 4 simple control tasks that could be utilized in a scramjet engine control system to position the shock train based on the sum of pressures within the isolator: 1) lowering ER to move the shock train downstream; 2) raising ER to move the shock train upstream, 3) changing the ER set point on a step change to keep the shock train within the desired range; and 4) adjusting the ER as required for downstream disturbances. Future plans are to evaluate the system using high-frequency pressure transducers and fast-acting hot-liquid-fuel valves to decrease the time response of the system and improve performance by adding a feedback control scheme to the algorithm.
Publication Year: 2012
Publication Date: 2012-07-30
Language: en
Type: article
Indexed In: ['crossref']
Access and Citation
Cited By Count: 23
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