Plume Trajectory Analysis Services

The trajectory of an exhaust plume is dependent on several factors:

• The velocity of the gas when it exits the exhaust stack;

• The velocity of the surrounding air; and

• The temperature of the gas relative to the ambient temperature.

It is important to understand the behavior of exhaust plumes as all these factors are varied in order to correctly specify the performance of a plume cooling system. Davis has experience in conducting plume trajectory analyses and recommending Plume Cooling System requirements.

Plume Cooling Systems are used on ships in order to:

• Reduce the impingement heating of ship surfaces from engine exhaust gasses; and/or

• Provide a safe environment for the crew.

Many ship antennae malfunction if their temperatures increase above 100-150 degrees C. The exhaust system of a ship must be designed to ensure that impingement temperatures on the ship mast are within the limits of for each antenna. Also, in cases where the exhaust exits at the side or stern of the ship, there is a danger that the plume can travel up to decks that are occupied by crew.

Ejector and SWI Plume Cooling Systems

Davis designs and supplies two types of Plume Cooling Systems:

• Air-to-air Ejectors for vertical uptakes; and

• Sea Water Injection (SWI) systems for horizontal side-exhaust systems.