Structure Optimization Design and Airflow Numerical Simulation for Negative Pressure Isolated Cabin

摘要

Structure optimization design of negative-pressure isolated cabin and numerical simulation for airflow are preformed by using CFD method, and trace of expiration contamination by patient are studied. Results show that when area of outlet setting as 4235mm~2, the negative pressure in cabin reached -31.96 Pa meeting to the design requirements. And air flow rate near the head of the body are 0.14m/s, which is comfort for human and closing to test value(0.11m/s). Flow rate and pressure in the cabin distributed evenly in the most of the space.of cabin, by which bio-safety and comfort was assured . Results also show that fresh air, after fully spreading, formed airflow to the feet above chest which can drive contaminants expelling from the mouth forming one-way flow to the feet direction, which can ensure maximum exhaust to discharge from cabin and air quality in the cabin improved.