This paper is a condensed version of a chapter in the forthcoming Next Generation Program (NGP) final report edited by the authors. It summarizes the research conducted during the NGP program on fluid dispensing and dispersion within aircraft engine nacelles by various principal investigators, including the authors. Fire-suppression systems for protecting aircraft engines typically consist of a suppressant storage bottle(s), a piping system connecting the bottle(s) to the discharge port(s), and the discharge nozzle(s). In some cases, nozzles are not used; the fluid simply discharges from the pipe-end. Fluid dispensing addresses the multi-component, two-phase flow of the fire suppressant through the piping before it is discharged. Fluid dispensing includes the initial conditions for agent discharge that affect the subsequent dispersion of the suppressant. The fluid dispensing aspects will be discussed in the Fluid Storage and Fluid Transport through Piping sections. The aspects of fluid storage are related to the determination of the thermodynamic state of the fluid in the bottle and the sizing of the bottle required to accommodate sufficient agent required for fire suppression without compromising the bottle's structural integrity. The discussion of fluid transport through piping describes the flow of fire suppressant through various piping configurations (straight pipes, bends, tees, etc.). The two-phase computer code was derived from a code widely used in the nuclear industries. This program was benchmarked against transient experimental data available in the literature as well as experiments conducted in the NGP.
and Keyser, D.
Fluid Dispensing and Dispersion, Halon Options Technical Working Conference, Albuquerque, NM, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=100934
(Accessed September 26, 2023)