Experimental study on characteristics of the jet flow from an aircraft gasper

Modeling of gasper-induced jet flow and its impact on cabin air quality

“…12(a). This trend agrees with the results illustrated in Dai et al [8], and the rea- son might be that under the same initial velocity, a larger opening size led to greater fluid momentum from the gasper inlet, which pushed the merging point forward. Meanwhile, due to greater momentum at larger opening, maximum axial velocity was also found to be larger as opening increased.…”

“…The general trends of the profiles are very similar. The results also show that, with the same gasper geometry, the peak locations under various initial velocities are very close to each other, which agrees with the experiments in Dai et al [8]. Furthermore, a plot of normalized centerline velocity U c /U max versus normalized axial location (z − z peak )/D ( Fig.…”

“…To model the case measured by Dai et al [8], this study placed the gasper model (nozzle diameter D = 12.6 mm) into a cylindrical calculation domain with a diameter of 500 mm (40D) and a length of 600 mm (48D), as shown in Fig. 3.…”

“…Before the peak velocity location, a cubic function was used to describe the velocity profile, which increases dramatically at first, and then gradually becomes slower as the location becomes closer to the peak location. Experimental data [8] was used for curve fitting, which yielded the normalized velocity profile Uc Umax = g(z) = 1.49z 3 + 2.31z 2 + 1.19z + 1.18, wherez = z − z peak /D. The centerline velocity starts to decay after the flow has reached its peak centerline velocity.…”

Predicting airflow distribution and contaminant transport in aircraft cabins with a simplified gasper model

“…Dai et al (2015) measured the flow field of a gasper-induced isothermal jet with a high-precision hotwire anemometer. You et al (2016) used a particle imaging velocimetry (PIV) technique to measure the interactions among the gasper-induced flow, the main flow in *Corresponding author.…”