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50 Figure 4.6 kp* obtained from plotting relative change in SFC (Scholz 2014) The second method of determining the mass flow rate of fuel consumed by the motor is intro- duced by Scholz (2014). The previous method is a conventional approach compared to second method. In the second approach, Scholz defines a new shaft power factor πβ compared to the previous method. This factor is obtained by plotting each data point for various engines in dif- ferent altitudes and Mach numbers. From the above graph, the value of πβ is equal to 0.0094 N/W.ThenewmethodofcalculatingπΜ , isgivenin(4.43)wherethePowerisdividedbya unified thrust, which is the take-off thrust. πΜ, =πββπ ππΉπΆβπ (4.43) π π =πβ βπ (4.44) π In (4.44) we can calculate the π using the second method. In this case, by inputting the val- ues for cruise thrust and take-off thrust, a constant value is 0.0016 N/W is found for π . The value is constant since cruise thrust to take-off thrust ratio is approximately equal to 0.2. πΜ=πΜ, +πΜ, (4.45) πΜ , the total mass flow rate of fuel consumed by the whole propulsion system is the sum of the calculated fuel mass flow rates of motor and turbofan engine. πππΉπΆ , = πΜ (4.46) πPDF Image | Comparison of Concepts: Classic Jet Propulsion, Turbo-Electric Propulsion and Turbo-Hydraulic Propulsion
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