In the current study, an experimental setup was built to investigate the gas flow and particle distribution in a normal jet crossflow to a main flow in a confined test section. The experiments were conducted under two test conditions: with $Re_c/Re_{jet}$ of $7.9{ imes}10^4/3.1{ imes}10^4$ and $7.0{ imes}10^4/1.8{ imes}10^4$ Four classes of particles were used in both tests. The planar gas flow field and particle distribution on the symmetric cross-section were measured by a DPIV system. Mean fluid velocity results and transient flow visualization images were used to analyze the jet influence on the gas flow field. The analysis of the time-average particle concentration reveal that the jet control method may set a gas barrier in the flow field, which the tiny particles are able travel around, large particles are able travel through, and only 10-micron-scale particles could be successfully blocked. The results show that the wall jet control method can be applied in inertia particle separator.