There are two types of flow we talk about: turbulent flow and laminar flow. To change turbulent to laminar, we need a way to disperse or spread out the flow.
A cheap and fairly effective method for this is to use a foam block in front of the outflow. This will reduce flow as well as disperse it. If you want to keep the flow rate but disperse, you'll have to get creative with a spray bar type attachment or something.