Nearly all the precipitation that falls on the earth results from the cooling of rising air . 几乎落到地球上的所有降水都是由于上升空气的冷却。
Ventilation for buildings - performance testing of components products for residential ventilation - externally and internally mounted air transfer devices 建筑物通风.住宅通风用部件产品的性能检验.外部和内部上升空气传送设备
Numerical simulation by cfd was carried out to understand the hot current behavior in a tunnel with longitudinal ventilation . it becomes clear that fire source modeling is very important because the hot current behavior is strongly affected by the fire source position and is sensitive to methods in the modeling of the fire source . the flame area which has developed from the fire source is an area of chemical reaction caused by combustion . even if grids in the vicinity of the fire source are made fine , it was difficult to simulate the heat generation area with consideration to this chemical reaction through using a method for setting the heat release rate simply on the fire source surface . therefore , we proposed a method adopting the knowledge on flame shape under the longitudinal ventilation and incorporating it into numerical simulation and it showed a good agreement with the experimental results . it was shown through experiments in a tunnel with longitudinal ventilation that the hot current developed toward the tunnel center downwind from the fire source near a wall . the cause was investigated by numerical simulation and it became clear from the results that the spiral air by the fire plume created a vortex in the crevice between the wall and the plume 运用cfd进行数字模拟,以了解纵向通风隧道内热烟气流的特性.通过模拟发现对火源进行模拟非常重要,热烟气流特性受火源位置的影响很大,并且对火源模拟方法很敏感.火源生成的火焰区是燃烧引起的化学反应区域.即使火源附近的木垛排列完好,也很难在考虑这些化学反应条件下模拟热生成区域.建议考虑纵向通风隧道内火焰形状并对它进行数字模拟.模拟结果与试验结果非常吻合.试验证明,在纵向通风隧道内,热烟气流从靠近墙体火源处顺风向隧道中心蔓延.数字模拟结果发现,火灾羽流造成的螺旋上升空气会在墙体和羽流之间形成一个涡流区
Abstract : numerical simulation by cfd was carried out to understand the hot current behavior in a tunnel with longitudinal ventilation . it becomes clear that fire source modeling is very important because the hot current behavior is strongly affected by the fire source position and is sensitive to methods in the modeling of the fire source . the flame area which has developed from the fire source is an area of chemical reaction caused by combustion . even if grids in the vicinity of the fire source are made fine , it was difficult to simulate the heat generation area with consideration to this chemical reaction through using a method for setting the heat release rate simply on the fire source surface . therefore , we proposed a method adopting the knowledge on flame shape under the longitudinal ventilation and incorporating it into numerical simulation and it showed a good agreement with the experimental results . it was shown through experiments in a tunnel with longitudinal ventilation that the hot current developed toward the tunnel center downwind from the fire source near a wall . the cause was investigated by numerical simulation and it became clear from the results that the spiral air by the fire plume created a vortex in the crevice between the wall and the plume 文摘:运用cfd进行数字模拟,以了解纵向通风隧道内热烟气流的特性.通过模拟发现对火源进行模拟非常重要,热烟气流特性受火源位置的影响很大,并且对火源模拟方法很敏感.火源生成的火焰区是燃烧引起的化学反应区域.即使火源附近的木垛排列完好,也很难在考虑这些化学反应条件下模拟热生成区域.建议考虑纵向通风隧道内火焰形状并对它进行数字模拟.模拟结果与试验结果非常吻合.试验证明,在纵向通风隧道内,热烟气流从靠近墙体火源处顺风向隧道中心蔓延.数字模拟结果发现,火灾羽流造成的螺旋上升空气会在墙体和羽流之间形成一个涡流区
上升: rise; go up; ascend空气: air; atmosphere上升空气流: ascending air上升(升空): go up上升空间: climbing space; upside potential提升空气: lift air提升空气流率: lift air rate升空: lift-off; levitation◇升空弹射器 launching catapult空气上升道: air uptake升空号: ariel上升: rise; go up; ascend 气温上升。 the temperature is going up. 他的成绩上升到全班第一名。 he has climbed to the head of his class. 我们的生产稳步上升。 our production goes steadily up. 这个行动制止了英镑的下跌, 但是未能使比价有很大上升。 the move stopped the pound's decline but failed to bring about a significant rally.; 上升点 rising point; 上升动作 vertical motion; 上升功率 ascending power; 上升花序 ascending inflorescence; 上升角 [航空] angle of climb; 上升力 climbing power; 上升螺旋桨 lifting airscrew; 上升气流 anaflow; up-ward current; upflow; ascending air; up currnet; 上升失速 [航空] advance stall; 上升速度 rate of climb; rate of upward gradient; ascensional velocity; 上升运动 ascending motion; 上升转弯 [航空] pull-up turn; 上升状态 propradation发射升空: liftoff; blastoff; take off紧急升空: scramble离地升空: lift-off升空弹射器: launching catapult升空高飞: hi-fly升空命令: airborne order使飞机升空: render the aircraft airborne; take the aircraft into flight升空的战斗机: put-up fighter用气球升空的: balloon borne; balloon carried; balloon-borne; balloon-carried上升;坡度;上升的: uphill高升空中的烟羽: lofting plume升空型菌丝组织: aerial mycelium空气: 1.(大气) air; atmosphere 呼吸新鲜空气 breathe fresh air; 放进空气 admit air; 空气寒冷刺骨。 there is a nip in the air. 苹果花使空气充满香味。 the apple blossoms fills the air with their fragrance.2.(气氛) atmosphere 制造紧张空气 create a tense atmosphere3.(气闸) air brake4.pneum-; pneumo-; pneumat-; pneumatio-; atm-; atmo-; physo-; aer-; aero-; 空气按摩法 pneumomassage; 空气饱和 saturation of the air; 空气爆破 [工业] airblasting; airbreaking; 空气泵 air pump; 空气层 air layer; 空气冲击 [采矿工程] air blast; 空气抽出器 [机械工程] air ejector; 空气出口 air outlet slit; 空气除尘 air cleaning; 空气除湿 air dewetting; 空气储存量 air storage capacity; 空气处理 air treatment; 空气传导 air conduction; 空气锤 air forging hammer; air hammer; pheumatic hammer; 空气带 [机械工程] air belt; 空气弹道学 [力学] aeroballistics; 空气当量 [核子] air equivalent; 空气挡板 air register;空气道 air channel; 空气动力舵 aerodynamic rudder; 空气动力飞行器 [航空] aerodynamic vehicle; 空气动力学 aerodynamics; airmechanics; air-flow mechanics; 空气发动机 [工业] air engine; 空气阀 [机械工程] air valve; pressure lock; 空气浮力 aerostatic buoyancy; 空气 (气动力)负荷 airload; 空气干燥 air drying; 空气干燥器[机] air drier; air dryer; atmospheric drier; 空气管 air tube; 空气混合室 air mixing chamber; 空气静力学 aerostatics; 空气力学 [流] aeromechanics; air mechanics; 空气疗法 aerotherapy; aerotherapeutics; 空气流 [流] air current; airflow; airstream; 空气流动 air flow; 空气流量 [航空] air mass flow; 空气流量表 [航空] airflow meter; 空气流速计 airmeter; airometer; 空气流体动力学 aerohydrodynamics; 空气囊 air bag; 空气凝汽器 [机械工程] air condenser; 空气喷管 air lance; 空气喷气动力装置 air-breathing power plant; 空气喷气发动机 air breathing jet engine; thermojet; aerojet engine; atmospheric jet; aeroresonator; aeropulse (脉动式); 空气喷射 aerojet; air injection; air jet; 空气喷射泵 air ejector; 空气喷射喷嘴 air injection nozzle; 空气喷射器 air ejector; 空气喷嘴 air nozzle; blow nozzle; skelp blower; 空气热力学 aerothermodynamics; 空气散热片 air-cooling fin; 空气散热器 air radiator; 空气扇 [机械工程] air propeller; 空气射流 air-spray; airstream; air jet; 空气声学 aeroacoustics; 空气水压机 air hydraulic press; 空气弹簧 [机械工程] air spring; pneumatic spring; 空气消声器 air silencer; 空气消音器 air silencer; 空气效应 air effect; 空气循环 [机械工程] air circulation; air cycle; 空气氧化 air oxidation; 空气制动 air damping; air brake; 空气制动器 [机械工程] air brake; 空气阻力 [航空] air drag; air friction; air reaction; air resistance 上升矿液: ascending mineralizing solution上升卷门关闭器: overhead door closer