This ram air is generated by the aircraft flight speed and is driven into the primary heat exchanger by a special scoop. This scoop has often a variable geometry electrically driven depending on of the flight phase (take off, cruise, etc.). 5 th step :
[1]John F Marsh. Chem Indus, 1987(20): 470 纳米润滑材料研究中亟待解决的问题: 2 Whitte J.US PatP].44275591984 (1)寻找普遍可行的纳米材料制备技术,降低B] Hunt M WUS PatP148678911989 成本; [4] Inoue K U. Soc Trib Lub Eng 1993(49): 263