The above mentioned information is taken from: http://en.wikipedia.org/wiki/Destin-Fort_Walton_Beach_Airport.
The most common type of cascade type thrust reverser system in use today for an aircraft fan gas turbine jet engine employs a forward fixed cowl portion and a translating sleeve which carries a plurality of circumferentially arranged blocker doors on its inner skin surface.
The previous answers pretty much explain the complete reason behind the installation of strakes on an engine cowling. But let me give you an elaborated explanation and a useful reference. Strakes, in brief, help in increasing the stall AoA of an aircraft. The airflow from the engine nacelle affects the main flow over the wing, especially when high-lift devices are deployed.