Using experimental and numerical results, this paper describes the effects of tabs on the flow characteristics of a plane jet at comparatively low Reynolds numbers while focusing on the velocity field and the vortical structure. The flow visualization and velocity measurements were respectively carried out using laser Doppler velocimetry (LDV) and particle image velocimetry (PIV). In addition, three-dimensional (3D) numerical simulations of a plane jet were performed using ANSYS Fluent, a commercially available computational fluid dynamics (CFD) software application. We found that the spreads of jets perturbed by large delta tabs and round tabs are larger than those produced by the other tabs tested. Additionally, it was determined that a plane jet with square tabs has the smallest jet spread downstream, and the jet’s centerline velocity is maintained in comparison with those of jets perturbed by the other tabs. It was also observed that the spanwise large-scale vortical structure of a plane jet with tabs disappears completely. Good agreement is found between the experimental and numerical simulation velocity profiles in the area near the nozzle exit when the laminar flow model is used. However, we also found that large eddy simulation (LES) is better at predicting the developing flow field of a plane jet than the laminar and the standard k-ε turbulence models.