Journal
APPLIED SCIENCES-BASEL
Volume 8, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/app8122637
Keywords
thermoelectric generator; energy conversion; energy harvesting; aviation; jet engine; specific fuel consumption; module design; filling factor; FEM; simulation
Categories
Funding
- German Federal Ministry of Economic Affairs and Energy [20E1303]
- MTU Aero Engines AG
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Finite element model (FEM)-based simulations are conducted for the application of a thermoelectric generator (TEG) between the hot core stream and the cool bypass flow at the nozzle of an aviation turbofan engine. This work reports the resulting requirements on the TEG design with respect to applied thermoelectric (TE) element lengths and filling factors (F) of the TE modules in order to achieve a positive effect on the specific fuel consumption. Assuming a virtual optimized TE material and varying the convective heat transfer coefficients (HTC) between the nozzle surfaces and the gas flows, this work reports the achievable power output. System-level requirement on the gravimetric power density (>100 Wkg(-1) ) can only be met for F <= 21%. When extrapolating TEG coverage to the full nozzle surface, the power output reaches 1.65 kW per engine. The assessment of further potential for power generation is demonstrated by a parametric study on F, convective HTC, and materials performance. This study confirms a feasible design range for TEG installation on the aircraft nozzle with a positive impact on the fuel consumption. This application translates into a reduction of operational costs, allowing for an economically efficient TEG-installation with respect to the cost-specific power output of modern thermoelectric materials.
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