What is the purpose of an aspirator in foam systems?

The purpose of an aspirator in foam systems is to create jet streams of foam solution. Aspirators are designed to mix foam concentrate with water and air, generating a foam solution that can be effectively discharged in a controlled manner. The jet streams facilitate the proper mixing and aeration of the foam, ensuring it achieves the necessary properties for effective firefighting. This is essential for creating the right type of foam that can blanket a fire and suppress flames by cutting off oxygen and cooling the burning material.

Other options such as discharging foam solution as a spray or maintaining constant pressure in pipes do not accurately describe the primary function of an aspirator. While these activities may be related to the operation of a foam system, they do not capture the specific role of an aspirator in generating the foam solution.