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25 Figure 3.2 Dimensions of Airbus 320 aircraft (Airbus 2005) The length of the piping depends mainly on the location of the pump and the motor. Initially, the gas turbine engine and the pump were placed in the aft of the aircraft. This reduced the noise and insulation required while acting as an optimum position for exhaust. But since the piping required is long, it led to a significant increase in mass of piping and reduction in effi- ciency. To overcome this effect, the gas turbine engine and hydraulic pump were placed in the centre under-belly of the aircraft as shown in Figure 3.1. The exact dimensions required were measured from Figure 3.2. Since there is a pressure drop, a new pressure (𝑝 ) is obtained. This can be calculated sub- tracting the pressure difference (∆𝑝) from standard operating pressure (𝑝). The efficiency of the pipe can be defined. 𝜂 = 1 − ∆𝑝 (3.11) 𝑝 Subsequentially, the parameters of the motor are obtained. This can be done in a method simi- lar to the pump. The new pressure must be utilized to calculate the parameters. The same effi- ciency is used for pump and motor and the value is 0.9. To proceed further in the sizing of the HPS, one must identify the mass of the defined compo- nents. Since the size of the motor and pump depend mainly on the required power by the air- craft, therefore a standard motor available from the industry cannot be used. The mass of the pump, motor and the piping are mainly considered.PDF Image | Comparison of Concepts: Classic Jet Propulsion, Turbo-Electric Propulsion and Turbo-Hydraulic Propulsion
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