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Developing Method Using CFD to Design Hydrogen Isolation Structure with Waterproof and Dustproof Filters

Article of Honda R&D Technical Review Vol.34 No.1

Summary

With a view to still greater compactness and lighter weight in fuel cell systems, a method using computational fluid dynamics was developed to obtain the filter properties necessary to design a hydrogen isolation structure with waterproof and dustproof filters. The filter properties were identified by measuring gas pressure and concentration on both sides of the filter and then using computational fluid dynamics to simulate the measurements to reproduce their content.
The identified properties were confirmed to be versatile and applicable for other initial conditions of gas type, flow, and concentration.
The design method was also validated by comparing the gas concentrations obtained from measurement by a simple testing apparatus to the results of computational fluid dynamics using identified properties. It was confirmed that satisfactory prediction was possible even under conditions of extremely low gas flow.
As a result, a design method using computational fluid dynamics was developed to realize a safer, more compact, and lighter-weight hydrogen isolation structure with filters.

Reference

(1) Kimura, K., Kawasaki, T., Ohmura, T., Atsumi, Y., Shimizu, K.: Development of New Fuel Cell Vehicle CLARITY FUEL CELL, Honda R&D Technical Review, Vol. 28, No. 1, p. 1-8
(2) https://www.nitto.com/jp/ja/products/temish_search/about/
(3) JIS K 7126-1: Plastics - Film and sheeting - Determination of gas-transmission rate - Part 1: Differential-pressure method, (2006)
(4) JIS K 7126-2: Plastics - Film and sheeting - Determination of gas-transmission rate - Part 2: Equal-pressure method, (2006)
(5) ASTM D1434: Standard Test Method for Determining Gas Permeability Characteristics of Plastic Film and Sheeting, (2015)
(6) ISO 15105-1: Plastics - Film and sheeting - Determination of gas-transmission rate - Part 1: Differential-pressure methods, (2007)
(7) JIS P 8117: Paper and board - Determination of air permeance and air resistance (medium range) - Gurley method, (2009)
(8) JIS L 1096: Testing methods for woven and knitted fabrics, (2010)

Author (organization or company)

Kazuya SASAMOTO(Innovative Research Excellence Power Unit & Energy)、Keisuke SUDA(Innovative Research Excellence Power Unit & Energy)