The effect of fuel topology and control on thermal endurance of aircraft using fuel as a heat transfer agent was studied using an optimal dynamic solver (OPT). The dynamic optimal solutions of the differential equations governing the heat transfer of recirculated fuel flows for single- and dual-tank arrangements were obtained. The method can handle sudden jumps of operating conditions across different operating zones during mission and/or situations when control parameters have reached their physical limits. Although this method is robust in providing an optimal control strategy to prolong thermal endurance of aircrafts, it is not ideal for practical application because the method required iterative procedures to solve expensive nonlinear equations. The linear quadratic regulator (LQR), the feedback controller, can be derived by linearizing the adjoint equations at trim points to offer a simple control strategy, which can then be implemented directly in the feedback control hardware. The solutions obtained from both OPT and LQR were compared, and it was found two solutions were almost identical except in regions having sudden jump of operation conditions. Finally, a comparison between single- and dual-tank arrangements was made to demonstrate the importance of the flow topology. The study shows the dual-tank arrangement allows flexibility in how energy is managed and can release energy faster than a single-tank topology and hence provides improved aircraft thermal endurance.
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August 2018
Research-Article
Thermal Management of Single- and Dual-Tank Fuel-Flow Topologies Using an Optimal Control Strategy
P. G. Huang,
P. G. Huang
Professor
Department of Mechanical
and Materials Engineering,
Wright State University,
Dayton, OH 45435
e-mail: george.huang@wright.edu
Department of Mechanical
and Materials Engineering,
Wright State University,
Dayton, OH 45435
e-mail: george.huang@wright.edu
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D. B. Doman
D. B. Doman
Principal Aerospace Engineer,
Air Force Research Laboratory,
Control Design and Analysis Branch,
WPAFB, OH 45433-7531
e-mail: David.Doman@wpafb.af.mil
Air Force Research Laboratory,
Control Design and Analysis Branch,
2210 Eighth Street, Ste. 21
,WPAFB, OH 45433-7531
e-mail: David.Doman@wpafb.af.mil
Search for other works by this author on:
P. G. Huang
Professor
Department of Mechanical
and Materials Engineering,
Wright State University,
Dayton, OH 45435
e-mail: george.huang@wright.edu
Department of Mechanical
and Materials Engineering,
Wright State University,
Dayton, OH 45435
e-mail: george.huang@wright.edu
D. B. Doman
Principal Aerospace Engineer,
Air Force Research Laboratory,
Control Design and Analysis Branch,
WPAFB, OH 45433-7531
e-mail: David.Doman@wpafb.af.mil
Air Force Research Laboratory,
Control Design and Analysis Branch,
2210 Eighth Street, Ste. 21
,WPAFB, OH 45433-7531
e-mail: David.Doman@wpafb.af.mil
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received January 3, 2018; final manuscript received April 13, 2018; published online May 21, 2018. Assoc. Editor: Samuel Sami.
J. Thermal Sci. Eng. Appl. Aug 2018, 10(4): 041019 (8 pages)
Published Online: May 21, 2018
Article history
Received:
January 3, 2018
Revised:
April 13, 2018
Citation
Huang, P. G., and Doman, D. B. (May 21, 2018). "Thermal Management of Single- and Dual-Tank Fuel-Flow Topologies Using an Optimal Control Strategy." ASME. J. Thermal Sci. Eng. Appl. August 2018; 10(4): 041019. https://doi.org/10.1115/1.4040036
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