CAJ | 학술논문

压入式通风是隧道施工中采用较多的通风方法。为研究瓦斯隧道台阶法施工压入式通风流场及瓦斯分布规律，利用流体力学软件 Fluent 建立隧道三维模型并进行数值模拟，对局扇出风口与下台阶面不同布设距离及布设形式下流场进行对比，分析局扇布设位置对瓦斯浓度、风流速度分布的影响。模拟结果表明：在相同的入口速度条件下，局扇距离下台阶面越远，射流区迎头断面瓦斯浓度越大，回流区中高浓度瓦斯区域范围越小但最高浓度越大；局扇与风管异侧布设能平衡上下台阶区段内瓦斯分布。该研究为提出改善通风效果的途径提供理论依据。
압입식통풍시수도시공중채용교다적통풍방법。위연구와사수도태계법시공압입식통풍류장급와사분포규률，이용류체역학연건 Fluent 건립수도삼유모형병진행수치모의，대국선출풍구여하태계면불동포설거리급포설형식하류장진행대비，분석국선포설위치대와사농도、풍류속도분포적영향。모의결과표명：재상동적입구속도조건하，국선거리하태계면월원，사류구영두단면와사농도월대，회류구중고농도와사구역범위월소단최고농도월대；국선여풍관이측포설능평형상하태계구단내와사분포。해연구위제출개선통풍효과적도경제공이론의거。
The press-in type ventilation is a ventilating method that is more adopted in tunnel construction. In order to research flow fields and gas distribution laws of press-in ventilating in construction with the gas tunnel bench cut method,this paper establishes a three-dimensional model by means of fluid mechanics software Fluent and performs numerical simulation,compares different setting distances from the air outlet of local fans and lower step surfaces and flow fields under the setting forms,and analyzes the influences of setting locations of local fans on distribution of gas concentration and air flow speed.The result of simulation show that under the condition of the same inlet speed,the further the local fans are from lower step surfaces,the more the gas concentration at frontal section of forward flow zone,the smaller the range of high-concentration gas area in recirculation zone,but the more the maximum concentration;and arrangement of local fans and air ducts on opposite sides can balance gas distribution in upper and lower step sections.This research provides a theoretical basis for putting forward the ways of improving ventilating effect.