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of another system, especially a computer program designed for that purpose
CFD Projects
CAE Projects
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Bangalore International Airport Limited, Cargo Complex
Smoke Ventilation Design
Engineering solution
A mathematical model using CFD can be developed which would simulate the actual behavior of the system. At first the analysis was done without running the jet fans and the velocity contours of the airflow and the contours of smoke concentration at various time steps were determined. Then the second analysis was done with only jet fans operating at normal speed. Further the analysis was done with jet fans operating at 5400 m/s in fire mode.
Figure showing the CO concentration at different
time steps with both exhausts and jet fans operating
Figure showing the velocity at
a different plane section
Result
The following conclusions can be drawn from the results of CFD smoke simulations of ventilation system for “Cargo Complex – BIAL”:
i) The CO concentrations without using jet fans, was found to be much higher than the safe limit for human beings.
ii) The CO concentrations using jet fans, were found to be with in the specified limit as per ASHRAE standard.
iii) Smoke ventilation system was optimally designed to vent out smoke generated by a fire up to 5 MW.
Objective
The Main objective of doing CFD Analysis in “Cargo Complex – BIAL (Bangalore International Airport Limited)” was to optimize the number, location and the configuration of the jet fans to provide efficient ventilation to remove smoke in case of accidents in the cargo complex. The project was done to meet the requirements set by SMOKE exposure limit.
The input of the project was the data and information provided by the consultant in the form of 2-D layout drawing of “Cargo Complex – BIAL”.
Figure showing the wireframe of Cargo complex
Figure showing the finalized jet fans position
Fire representation
Four number of fork lifts were considered each emitting an assumed smoke with mass flow rate of 0.008 kg/sec , and a smoke density of 1.4743 kg/m3 and air density of 1.1614 kg/m3. The fire is represented as a fluid region where source of heat, mass flow rate and smoke were introduced. In the fire region, additional source terms are included in the mass continuity and energy equations.