CAJ | 학술논문

多分支隧道的排烟与补风路径较多，热压与风机动力的竞争可能造成其通风排烟模式具有多解性。针对某一多分支隧道的防排烟工况，利用理论分析建立了各种气流模式的控制方程，通过数学方法获得了理论解。结果证明，在按照预期设计选定通风排烟模式与风机以后，多分支隧道内的排烟气流仍然可能存在多种状态，风机的运行工况点也会随之漂移，导致排烟方向可能与设计预期完全相反。研究还发现，通过改变风机选型能起到抑制排烟气流出现多解的作用。
다분지수도적배연여보풍로경교다，열압여풍궤동력적경쟁가능조성기통풍배연모식구유다해성。침대모일다분지수도적방배연공황，이용이론분석건립료각충기류모식적공제방정，통과수학방법획득료이론해。결과증명，재안조예기설계선정통풍배연모식여풍궤이후，다분지수도내적배연기류잉연가능존재다충상태，풍궤적운행공황점야회수지표이，도치배연방향가능여설계예기완전상반。연구환발현，통과개변풍궤선형능기도억제배연기류출현다해적작용。
The multi‐branch tunnel has multiple routes for smoke extraction and air supply ,consequently its ventilation and smoke control modes could have multiple solutions owing to the competitive effects of buoyancy and fan power .For the smoke control of a multi‐branch tunnel ,the mass and energy balance equations for every possible flow pattern were established ,and the corresponding multiple solutions were obtained using mathematical methods .The results demonstrate that ,even though the exhaust ventilation mode and fan type have been determined in accordance with the anticipation ,multiple states of exhausted flow remain and the operation point of the fans will drift away from the design accordingly .This could cause a totally different direction of smoke route from the anticipated one .It is also shown that the type of fan has significant effects on the existence of multiple solutions .