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33 πππΉπΆ , =3.25369 β 10 βln π, βπππ β π β1.00060 β 10 (3.22) πππΉπΆ , = πΜ π, PSFC calculation results for TP 400 engine Result 6.03E-8 kg/W/s 5.07E-8 kg/W/s 5.55E-8 kg/W/s (3.23) Table 3.4 Method Koppe Literature Average The parameters of the aforementioned engine were extracted from Teal (2017) and Schwarze (2014) and are given in Table 3.3. The PSFC for the Europrop TP400 engine can be calculat- ed using (3.22) and (3.23). (3.23) is common literature method where fuel consumed by the engine( πΜ π) is divided by Power to calculate the PSFC. Since the results from both the meth- ods differ, an average is calculated and will be used. 3.3.2 Turboshaft Engine Another choice of gas turbine engine for this propulsion concept is the turboshaft engine. The main principle of the turboshaft engine is to provide more shaft power than jet thrust, similar to a turboprop engine. The important difference between the two engines are that unlike the turboprop engine, the turboshaft engine is not designed to support the loads created by a rotat- ing propeller since the propeller is not attached to the engine. Typically, a turboshaft engine is attached to a transmission that embedded in the structure to support the loads. This can be beneficial to the turbo-electric/hydraulic propulsion system concept since the gas turbine en- gine is attached directly to a hydraulic pump or an electric generator. π = 2.5401 β π , β 1.341022 . (3.24) . (3.25) The mass estimation and performance of the turboshaft engine is carried out according to StuΜckl (2016). The mass of turboshaft engine (π ) is calculated using (3.24) where power is inputted in kW. The πππΉπΆ is calculated using (3.25) in lb/shp/hr and the power is inputted in shp. Both the parameters are determined based on a statistical correlation. πππΉπΆ =2.2381β π ,PDF Image | Comparison of Concepts: Classic Jet Propulsion, Turbo-Electric Propulsion and Turbo-Hydraulic Propulsion
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