고체 가연물 주위의 유동과 열적 두께의 변화가 열방출률 특성에 미치는영향에 관한 실험적 연구

Experimental Study on the Effect of Flow around Solid Combustibles and Thermal Thickness on Heat Release Rate Characteristics

고체 가연물 주위의 유동과 열적 두께의 변화가 열방출률 특성에 미치는 영향을 고찰해보기 위해 ISO 5660-1 콘칼로리미터 실험을 수행하였다. 고체 가연물로는 연소반응 중 Char를 발생시키지 않는 Polymethyl methacrylate(PMMA)를 선정하였고 열침투깊이를 계산하여 PMMA의 열적 두께를 구분하였다. 콘 칼로리미터의 덕트 유동을 12,24, 40 L/s로 설정하여 가연물 주위에 강제 유동을 발생시킨 뒤 PMMA의 연소 시 측정된 열방출률을 측정함으로써열분해 특성을 분석하였다. 열적으로 얇은 가연물의 열방출률은 주위의 유동 변화에 크게 영향을 받지 않았지만, 열적으로 두꺼운 가연물은 유량의 변화에 따라 열방출률이 크게 영향 받는 것을 확인하였다.

In this study, an ISO 5660-1 cone calorimeter experiment was conducted to examine the effects of changes in flow andthermal thickness around solid combustibles on heat release rate characteristics. Polymethyl methacrylate (PMMA) is a solidcombustible material that does not generate char during the combustion reaction. Hence, it was selected for the experiment,and the thermal penetration depth was calculated to distinguish the thermal thickness of PMMA. Furthermore, the thermaldecomposition characteristics were analyzed by measuring the heat release rate measured during the combustion of PMMA. This was performed after generating the forced flow around the combustibles by setting the duct flow of the conecalorimeter to 12, 24, and 40 L/s. The results confirmed that the thermal release rate of the thermally thin combustiblematerial was not significantly affected by the change in the surrounding flow. Hence, the thermally thick combustiblematerial was significantly affected by the change in the flow rate.