This study proposes a new separator based on the Coanda effect to address the issue of low separation efficiency in traditional separators at low gas velocity. The study investigates the impact of inlet velocity on streamlines, pressure drop, and separation efficiency through numerical simulation. Additionally, an experimental platform was constructed to measure the application effect of the new separator using PDPA. Then the following conclusions were drawn: (1) The separation mechanism of WAS is a comprehensive process that utilizes the Coanda effect, supplemented by collision and centrifugation. (2) The inlet gas velocity has little impact on streamlines and droplet attachment, and the mass separation efficiency is 99.9 % when the velocity is between 1–12 m/s. (3) Within the gas velocity range mentioned above, PDPA was used to monitor droplet size information at the outlet. The results showed that droplet sizes were mainly between 0 and 20 μm, with droplets larger than 20 μm being almost completely separated. The droplet size distribution curves at the outlet were consistent, with peak values of 6.5 μm. This results are consistent with the numerical simulation results, verifying the accuracy of the simulation and indicating that WAS has high separation efficiency and a wide range of gas velocities. (4)The main flow loss occurs between the jet nozzle and the outlet of the separation element. At this stage, the total pressure drop accounts for 96 % of the entire process, and the static pressure drop accounting for 56 % of the entire process. Then the correlation formula between pressure drop and inlet velocity was obtained by fitting the experimental results.