本文選題：泄爆　切入點：動網格　出處：《熱能動力工程》2017年08期

【摘要】：為研究電除塵器在泄爆過程中流場與泄爆閥的動態(tài)特性,基于動網格技術,建立了泄爆過程中流體與閥體間的耦合關系,對泄爆過程進行了三維瞬態(tài)模擬,對不同爆炸壓力、閥蓋行程、彈簧剛度以及氣體介質溫度對泄爆過程的影響進行了分析。對初始溫度為2 000 K,相對壓力40 kPa的空氣介質,閥蓋行程60 mm泄爆閥在0.152 s內完成泄爆并復位,泄放體積約為2.95 m~3。分析結果表明:隨著內部壓力的增大,泄爆時間隨之呈線性增加;增大閥蓋的行程,閥蓋前期運動情況不變,中后期泄放速率增大,總體泄放時間降低,且降低趨勢逐漸平緩;一定范圍內改變彈簧的剛度對泄爆效果無明顯影響;隨著氣體介質溫度的降低,泄爆時間與泄放速率迅速增加,溫度從2 000 K降低到300 K時,泄爆時間從0.15 s增加到0.35 s,但泄放過程最大馬赫數(shù)基本不變。
[Abstract]:For the study of electrostatic precipitator in the venting process flow and vent valve dynamic characteristics, dynamic grid technology based on the established coupling relationship between the fluid and the venting valve body in the process of venting process of three-dimensional transient simulation of different explosion pressure, valve cover travel, spring stiffness and gas temperature has carried on the analysis to the venting process. The influence of the initial temperature is 2000 K, the relative pressure air medium of 40 kPa, 60 mm stroke valve cover vent valve within 0.152 s venting and reset, discharge volume is about 2.95 m~3. the results show that: with the increase of internal pressure, venting time increase linearly; increase the valve stroke, constant valve cover pre movement, in the late discharge rate increases, the overall discharge time is reduced, and the decreasing trend becomes slower; changing the spring stiffness in a certain range has no obvious effect on the venting effect with gas; When the temperature of the medium decreases, the venting time and the discharge rate increase rapidly. When the temperature decreases from 2000 K to 300 K, the venting time increases from 0.15 s to 0.35 s, but the maximum Maher number in the relief process is basically unchanged.

【作者單位】： 燕山大學機械工程學院;燕山大學國家冷軋板帶裝備及工藝工程技術研究中心;燕山大學環(huán)境與化學工程學院;
【基金】：河北省自然科學基金資助項目(E2015203236) 河北省重大技術創(chuàng)新項目(10273920z)
【分類號】：X932
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本文編號：1718396