b'Aerospace | Engineer Innovation[rev/min]system can be easily modeled with the3x10 [null]Gas Mixture and Moist Air library. 40 1.0Finally, the models of the aircraft0.8thermal structure and the ACMs and30distribution network can be integrated 0.6together. This allows you, among other things, to verify that the cooling units20are correctly sized and to simulate the0.4overall system performance during10failure conditions. 0.2ACM Shaft Speed [rev/min]FVC opening ENG 1 [null]The initial objective of this article was0 0to simulate the pull-down or cabin0 5 10 15 20cooling case scenario. This is possiblex: Time [s]with the integrated model and the results achieved are plotted below. The first subplot shows the aircraft mission[null]profile, i.e. the Mach number and the360 Mixing Point Target Temperature [K] 0.35altitude from which the static and total350 Response [K] 0.30pressure and temperatures are derived.340 Trim Air Opening [null]The second subplot shows instead the0.25atmospheric static temperature and330 0.20the temperature inside the cabin. You320can note that the initial cabin0.15310temperature is set to 45C (113F) andACM Start 0.10the atmospheric static temperature on300 Controlground is 40C (104F). The plot cursor290 0.05is set at t=0s, i.e. 30 minutes after the ACM start-up.280 0 5 10 15 20 0.00x: Time [s]Therefore, using Simcenter Amesim you can see how the cabin temperature falls below the requested threshold,[ft]and validate the system performancex103 [null]35 1.0for the pull-down or cabinX=0cooling case. 30 0.825 Y_1 = 0Related content 20 Y_2 = 0 0.6[1]Cappuzzo, F., Broca, O., and15 0.4 Leboi, J., "Simulation of Aircraft10Virtual Architecture - BleedAircraft Altitude [ft] 0.25Off-Take and ECS," SAE TechnicalMach Number [null]Paper 2017-01-2159, 2017, https:// 0 -2 -101 2 3 4 5 0.0 3doi.org/10.4271/2017-01-2159. x: Time [s] x10[2]Unlu, D., Cappuzzo, F., Broca, O.,and Borrelli, P., "Minimizing 50Aircraft ECS Bleed Off-Take - Virtual Integrated Aircraft40Applications," SAE Int. J. Aerosp.309(1):151-162, 2016, https://doi. 20org/10.4271/2016-01-2054. n 100 X=0-10 Cabin Temperature [degC] Y_1 = 26.50656-20 Static Air Temperature [degC] Y_2 = 40 3-30 x10-2 -101 2 3 4 5x: Time [s]49'