Experimental Research on the Attenuation Rules of Personalized Air-Conditioning Nozzle Jet Flow in Aircraft Cabins

A full size simulation laboratory aircraft cabin comprising three rows of seats has been built. This represents the Airbus A320 and the China C919 aircraft. Experimental research on the attenuation rule of the individual air-conditioning isothermal jet flow from nozzles positioned above the seats was conducted. The results show that axial air velocity continuously decreases with increasing cross-sectional distance. For a distance x < 0.4 m, (the axis air velocity sharp attenuation area), the velocity of attenuation slows. When 0.7 m < x < 0.9 m, the velocity remains at about 1m.s-1 with the vents fully open, and at about 0.5 m.s-1 with the vents half open. The air velocity distribution of different cross-sections is axisymmetric and basically in line with the circular outlet jet flow rule. Combined with empirical formulae, the turbulent coefficient values of the isothermal jet flow in the airplane cabin was established as 0.1021 with the vents fully open and 0.1776 with the vents half open. The spread angles α of jet flow for these two conditions were found to be 19.14° and 31.12° respectively. The axial velocity attenuation rule was also confirmed. The experimental results align with those anticipated by calculation.