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22 3 Sizing Methodology of Propulsion Systems This chapter explains in detail the sizing methods of all the propulsion systems used. Espe- cially, the hydraulic propulsion is explained in detail because of lack of previous research. The electric propulsion system is sized by using existing models and empirical data. There are two types of gas turbine engines (turboshaft and turboprop) that are used for turbo- hydraulic/electric models. The term motor is used to describe electric or hydraulic motor, de- pending on the context. 3.1 Hydraulic Propulsion System Figure 3.1 Turbo-hydraulic Propulsion System Architecture The utilization of a Hydraulic system in aircraft propulsion is a novel concept. Although, they have been propelling ships and boats for quite a while. Since hydraulic systems are used for other sub-systems in an aircraft, it benefits one in the requirements for an airborne technolo- gy. For this reason, the system components sizing of the Hydraulic Propulsion System (HPS) will be derived from flight rated components available in the industry. The methodology for sizing HPS is taken from various sources. In order to size a hydraulic system, the basic parameters of such a system must be defined. This includes defining Operating pressure (𝑝), rated power (𝑃), Volumetric flow (𝑄), drive speed of the motor and pump (𝑛) and displacement (𝑣). The only known parameter would be the output power required and this will be derived in the following chapters. 𝑝 and 𝑛 can be determined by inputting various values for them and narrowing down to a realistic value. The formulae used for hydraulic pump and motor are taken from the Rexroth Formulary by Hata- mi (2013). It is assumed that the hydraulic pump is attached to the shaft of a Gas Turbine (GT) engine and that the output power of the GT is the input power of hydraulic pump. 𝑃= 𝑝∙𝑄 (3.1) 600 ∙ 𝜂PDF Image | Comparison of Concepts: Classic Jet Propulsion, Turbo-Electric Propulsion and Turbo-Hydraulic Propulsion
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