NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.
Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.
An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Cold Discharge of CF3I in a Simulated Aircraft Engine Nacelle
Published
Author(s)
Jiann C. Yang, Samuel L. Manzello, Marc R. Nyden, M D. Connaghan
Abstract
An aircraft engine nacelle simulator was built to study the dispersion behavior of CF3I, a potential halon 1301 (CF3Br) replacement, at an extremely cold temperature (nominally 40 C). The experimental fixture consists of a simulated engine nacelle with baffles, an agent release port, observation windows, and two measurement locations. The simulator has a configuration and dimensions commensurate with a typical small engine nacelle. The entire facility was placed inside a large environmental test chamber. Agent discharge experiments were conducted at –40 ˚C. The dispersion of CF3I was assessed by measuring the concentration at the two measurement locations in the simulator using fiber-optic-based UV spectrometers. Baseline agent dispersion performance was also established at room temperature. Compared to the measurements obtained at room temperature, there was a significant reduction in the agent concentration in the cold temperature release, and a fire suppression system designed based on room-temperature test data may fail to provide adequate fire protection.
Proceedings Title
Proceedings of the 7th International Symposium- SP 984
Yang, J.
, Manzello, S.
, Nyden, M.
and Connaghan, M.
(2003),
Cold Discharge of CF<sub>3</sub>I in a Simulated Aircraft Engine Nacelle, Proceedings of the 7th International Symposium- SP 984, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=861119
(Accessed October 13, 2025)