Pressure oscillations in supercritical jet-A fuel flowing through four parallel heated tubes connected to common manifolds have been observed in this study. Tests were performed with fuel inlet temperatures ranging from 70 °F to 700 °F, and fuel pressures ranging from 360 to 700 psi. Total fuel flow rate ranged from 5 to 55 lb/h. Tubes were heated by blowing 800–950 °F nitrogen over them. Acoustic-mode oscillations, typically ranging from 100 to 500 Hz, occurred only when a large temperature gradient was created inside the heated fuel tubes. Pressure oscillation amplitudes ranged from 0.1 to 1.0 psi. Oscillations at the inlet and outlet manifolds that were caused by a mode with the characteristic length of a single fuel tube were separated by a phase lag that was a function of the manifold cross-passage diameter. A lower frequency mode was also observed, which had a characteristic length based on the summed lengths of a single fuel tube and a single manifold passage. An acoustic simulation using the comsol acoustics module was performed to predict frequencies based on geometry and flow conditions of the experiment.
Thermoacoustic Oscillations in Multipath Heated Fuel Circuits
El Segundo, CA 90425
School of Aeronautics and Astronautics,
West Lafayette, IN 47907
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received June 14, 2016; final manuscript received April 20, 2017; published online May 16, 2017. Editor: Portonovo S. Ayyaswamy.
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Hunt, S., and Heister, S. (May 16, 2017). "Thermoacoustic Oscillations in Multipath Heated Fuel Circuits." ASME. J. Heat Transfer. September 2017; 139(9): 091801. https://doi.org/10.1115/1.4036597
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