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为研究电除尘器在泄爆过程中流场与泄爆阀的动态特性,基于动网格技术,建立了泄爆过程中流体与阀体间的耦合关系,对泄爆过程进行了三维瞬态模拟,对不同爆炸压力、阀盖行程、弹簧刚度以及气体介质温度对泄爆过程的影响进行了分析。对初始温度为2 000 K,相对压力40 kPa的空气介质,阀盖行程60 mm泄爆阀在0.152 s内完成泄爆并复位,泄放体积约为2.95 m~3。分析结果表明:随着内部压力的增大,泄爆时间随之呈线性增加;增大阀盖的行程,阀盖前期运动情况不变,中后期泄放速率增大,总体泄放时间降低,且降低趋势逐渐平缓;一定范围内改变弹簧的刚度对泄爆效果无明显影响;随着气体介质温度的降低,泄爆时间与泄放速率迅速增加,温度从2 000 K降低到300 K时,泄爆时间从0.15 s增加到0.35 s,但泄放过程最大马赫数基本不变。
In order to study the dynamic characteristics of the flow field and the vent valve during the process of venting, the dynamic coupling between the fluid and the valve body during venting was established based on the moving mesh technique. The three-dimensional transient The influence of explosion pressure, cover travel, spring stiffness and gas medium temperature on the process of venting was analyzed. For the air medium with the initial temperature of 2000 K and relative pressure of 40 kPa, the valve cover travel 60 mm vent valve completed venting and reset within 0.152 s, and the venting volume was about 2.95 m ~ 3. The results show that the venting time increases linearly with the increase of the internal pressure. The increase of valve cap stroke, the constant movement of the valve cap in the early stage, the increase of the venting rate in the middle and late stages and the reduction of the overall venting time, And the decreasing trend is gradual and gentle. Changing the stiffness of the spring within a certain range has no obvious effect on the venting effect. With the decreasing of the gas temperature, the venting time and the releasing rate increase rapidly. When the temperature is reduced from 2000 K to 300 K, The vent time increased from 0.15 s to 0.35 s, but the maximum Mach number during the venting process remained unchanged.