Abstract
One of the objectives of the CleanSky-2 project is to develop an Environmentally Friendly Fire Protection (EFFP) system to substitute halon for the aircraft cargo hold. For this, an aircraft demonstrator including the cargo hold was equipped with a nitrogen-based fire suppression system. The demonstrator is located in the Flight Test Facility (FTF) low-pressure vessel and can thus be subjected to realistic cruise pressure conditions and take-off and descent pressure profiles. As a design tool, a zonally refined simulation model to predict the local oxygen and nitrogen concentration distribution in the cargo hold has been developed using the Indoor Environment Simulation Suite (IESS). The model allows for fast transient simulations of the suppression system operation. This paper presents a model validation case of knockdown during cruising, followed by a holding phase and descent.
Highlights
IntroductionThe system must be adequate to maintain a safe fire suppressive atmosphere inside the cargo hold for the specified diversion time
Validation of a Homogeneous and efficient fire suppression agent distribution inside an aircraft cargo hold is the key for protecting the aircraft from a cargo hold fire and for achieving the fire protection goals
Test and Results tion from 750 hPa to ground pressure. This repressurization is performed by supplying ambient air through the pressure management system (PMS)
Summary
The system must be adequate to maintain a safe fire suppressive atmosphere inside the cargo hold for the specified diversion time. The aircraft cargo fire suppression system has two major phases, a knockdown phase that diminishes fire either by cooling the fire or reducing the oxygen concentration as described in the Minimum Performance Standard (MPS) [1], followed by the holding phase to maintain a fire suppressive environment inside the cargo hold throughout the flight and landing phase. The cargo door seal is subjected to the gradient between the pressurized fuselage and ambient conditions at cruising and leaks air. This air is replaced with fresh air aspired through the Pressure
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