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28 Data from the product sheet of Parker (2009) to plot a graph with power produced against mass of the pump. These pumps are used as engine-driven pumps in various aircraft to supply hydraulic power with the variable displacement axial piston pump system. In the product sheet, the parameters such as flow rate and operating pressure were provided for more than 20 pumps. From Figure 3.4, one can calculate the volume of a pump or a motor whenever re- quired during the aircraft design process. From the Figure 3.5, the power-to-weight ratio for a hydraulic pump/motor can be deduced as 10 kW/kg. Table 3.1 Hydraulic pump/motor statistic Model of hydraulic pump Parker Hannifin Hydroeluc M12 Hydroeluc M18 Average Specific Power 10 kW/kg 11 kW/kg 16.7 kW/kg 12.8 kW/kg In Table 3.1, two additional models of hydraulic pumps are described. They are Digital Dis- placement hydraulic pumps according to Caldwell (2018). This pump is equipped with a radi- al piston machine that is controlled by computer-controlled valves. The benefits of this new technology as opposed to the analog machines are improved efficiency, reduced losses and high precision. Thus, now by averaging the specific power there is a new value of 12.8 kW/kg. ( ) ( ) 𝑚 = 12.8 ∙ 𝑃 𝑚 =𝑚 +𝑚 +𝑚 𝜂 =𝜂 ∙𝜂 ∙𝜂 ~77% hydraulic pump hydraulic motor (3.15) (3.16) (3.17) To conclude the sizing of the HPS, (3.15), (3.16) and (3.17) can be used to identify the overall mass and efficiency of the hydraulic propulsion system.PDF Image | Comparison of Concepts: Classic Jet Propulsion, Turbo-Electric Propulsion and Turbo-Hydraulic Propulsion
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