GC: n

CT: The steam generated in the topping evaporator is ejected through two sonic nozzles at opposing sides of the aft fuselage to reduce payload water vapor pollutants and to minimize venting thrust effects.

S: AGARD, p.87

N: 1. – sonic (adj): 1923, from Latin sonus “sound” (from PIE root *swen- “to sound”) + -ic. Sonic boom is attested from 1952.
– nozzle (n): Mid-15c., noselle “socket on a candlestick,” diminutive of nose (n.); with -el (3). Meaning “small spout” is attested by 1680s.
2. Gas mass flowmeter consisting of a smooth rounded inlet section converging to a minimum throat area and then diverging along a pressure recovery section or exit cone.
3. By design, sonic nozzles are a constant volumetric flow meter. However, with the use of a regulated pressure supply, the sonic nozzle becomes a “state-of-the-art” mass flow meter. Considering both the divergent section design and the flow rate, sonic nozzles may operate with an exit pressure as high as 90% of the inlet pressure.

S: 1. OED – https://bit.ly/2xQ3xZa; https://bit.ly/2YVO1qq (last access: 15 July 2019). 2. IATE – https://bit.ly/2YaeGCG (last access: 15 July 2019). 3. FSyst – https://bit.ly/2YVNl4m (last access: 15 July 2019).

SYN: sonic venturi-nozzle

S: GDT – https://bit.ly/2xN7ZIf (last access: 15 July 2019)

CR: actuator, cantilever fan blade.