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42 Topology Parallel Serial Partial parallel Topology Serial, Parallel, Partial parallel Topology Parallel, Partial parallel Serial 3 Methods for Sizing and Performance of Hybrid-Electric Aircraft Equations for the computation of 𝑇𝑚𝑎𝑥 𝑇𝑚𝑎𝑥 = 𝜂𝑃𝐷 · 𝑃𝑆h𝑎𝑓𝑡,𝐶𝑜𝑛𝑣,𝑚𝑎𝑥 + 𝑃𝑆h𝑎𝑓𝑡,𝐸𝑙𝑒𝑐,𝑚𝑎𝑥 𝑀·𝑎 𝑇𝑚𝑎𝑥 = 𝜂𝑃𝐷 · 𝑃𝑆h𝑎𝑓𝑡,𝐸𝑙𝑒𝑐,𝑚𝑎𝑥 𝑀·𝑎 𝑇𝑚𝑎𝑥 = 𝜂𝑃𝐷𝐶𝑜𝑛𝑣 · 𝑃𝑆h𝑎𝑓𝑡,𝐶𝑜𝑛𝑣,𝑚𝑎𝑥 + 𝜂𝑃𝐷𝐸𝑙𝑒𝑐 · 𝑃𝑆h𝑎𝑓𝑡,𝐸𝑙𝑒𝑐,𝑚𝑎𝑥 𝑀·𝑎 Equations for the computation of 𝑃𝑆h𝑎𝑓𝑡,𝐶𝑜𝑛𝑣,𝑚𝑎𝑥 𝑃𝑆h𝑎𝑓𝑡,𝐶𝑜𝑛𝑣,𝑚𝑎𝑥 = 𝑃𝐿𝐶𝐸 · 𝑃𝐶𝐸,𝑚𝑎𝑥 − 𝑃𝐶𝐸𝑂𝑓𝑓𝑡𝑎𝑘𝑒 Equations for the computation of 𝑃𝑆h𝑎𝑓𝑡,𝐸𝑙𝑒𝑐,𝑚𝑎𝑥 𝑃𝑆h𝑎𝑓𝑡,𝐸𝑙𝑒𝑐,𝑚𝑎𝑥 = min(𝑃𝐸𝑀,𝜂𝑃𝑀𝐴𝐷 ·𝜂𝐸𝑀 ·(𝑃𝐿𝐸𝐸𝑃𝐷 · 𝑃𝐸𝐸𝑃𝐷,𝑚𝑎𝑥 − 𝑃𝐸𝑙𝑒𝑐,𝑂𝑓𝑓𝑡𝑎𝑘𝑒)) 𝑃𝑆h𝑎𝑓𝑡,𝐸𝑙𝑒𝑐,𝑚𝑎𝑥 =min(𝑃𝐸𝑀,𝜂𝑃𝑀𝐴𝐷 ·𝜂𝐸𝑀 ·(𝑃𝐺,𝑚𝑎𝑥 − 𝑃𝐸𝑙𝑒𝑐,𝑂𝑓𝑓𝑡𝑎𝑘𝑒 + 𝑃𝐿𝐸𝐸𝑃𝐷 · 𝑃𝐸𝐸𝑃𝐷,𝑚𝑎𝑥)) Equation (3.8) (3.13) (3.16) Equation (3.9) Equation (3.11) (3.14) Table 3.1: Summary of maximum thrust computation for hybrid-electric propulsion system 3.2.4.3 Energy Characteristics Dealing with several energy sources in hybrid-electric propulsion systems requires the defin- ition of energy management strategies. The energy consumption characteristics need con- sequently to be mapped within the aircraft sizing and performance environment. In the context of hybrid-electric aircraft, the fuel power and the electric power required at the en- ergy source, 𝑃𝐸𝑙𝑒𝑐, need to be determined at each given flight state (𝛥𝐼𝑆𝐴, 𝐴𝑙𝑡, 𝑀) according to the thrust level 𝑇. To provide commonality with traditional performance analysis pro- grams, the same format as the fuel flow table is selected with the flight state 𝛥𝐼𝑆𝐴, 𝐴𝑙𝑡 and 𝑀 and the current engine net thrust 𝑇 as inputs and the 𝐹𝐹 as output. In addition,PDF Image | Conceptual Design Methods Hybrid-Electric Transport Aircraft
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