대단면 갱내 국부 선풍기의 벤츄리(Venturi) 효과 연구
Venturi Effects Induced by the Local Ventilation Fan in Large-Opening Room-and-Pillar Mining Sites
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참고문헌
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초록
환기제어 시설을 설치하지 않고 모든 공간을 개방한 형태의 대단면 주방식 채굴 작업장에 설치하는국부선풍기의 운전에 따른 기류유동형태는 재순환을 포함하고 있어 복잡하고 정량화가 어렵고 환기효율 또한매우 낮은 편이다. 본 논문에서는 국부선풍기의 운전에 따라 하류편의 기류 운동에너지 증가 및 정압강하 현상인 벤츄리(venturi) 효과로 인접갱도로부터 기류가 유입되어 기류 유동방향으로 환기량이 증가하는 현상을 선풍기 종류 및 설치방법 별로 CFD분석하였다. 분석대상 선풍기는 축류선풍기 1종류 및 프로펠러 선풍기 2종류이며축류선풍기 중심점 설치 위치를 1.0, 1.5, 2.0m로 변경함에 따른 벤츄리 효과의 차이를 분석하였다. 연구결과는공기질 개선을 통한 작업환경 관리를 위한 국부 환기의 경제성 및 효율성을 제고하는데 기여할 것으로 기대된다.
Abstract
In large-opening room-and-pillar mining sites, particularly without the devices for the ventilation control,the airflow pattern created by the local fan operation is too complicated to quantify and also shows low ventilationefficiency. This study aims at performing a series of CFD analysis for the so-called venturi effects of the localfans; the effects of increasing airflow rate along the axis downstream of fan resulting from increased kinetic energyand subsequently decreased static pressure in the downstream. Effects of the fan type and installation height arecompared. 1 vane-axial fan and 2 propeller fans are analyzed for their venturi effects, while the vane-axial fanwas installed at the height of 1.0, 1.5 and 2.0m for comparison. The results can be applied to improve the economyand efficiency of local fans for securing better air quality and work environment management.
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