广西大学学报（自然科学版）
廣西大學學報（自然科學版）
엄서대학학보（자연과학판）
JOURNAL OF GUANGXI UNIVERSITY （NATURAL SCIENCE EDITION）
2013年
3期
657-662
,共6页
自旋扭带%压降%数值模拟
自鏇扭帶%壓降%數值模擬
자선뉴대%압강%수치모의
self-rotating twisted tape%pressure drop%numerical simulation
为了直观地描述内置自旋扭带圆管内压降的特性，采用RNG k-ε湍流模型对内置静止扭带、自旋扭带圆管及空管的压降特性进行数值模拟研究，并进行了内置3种型号自旋扭带圆管压降特性的数值模拟和试验研究。研究表明：自旋扭带管的压力降约为空管的2倍，而静止扭带管的压力降差不多达到空管的3倍；在含有自旋扭带或静止扭带的管段内，压力沿轴线方向线性变化，与理论分析趋势一致；扭带压降（流体与自旋扭带的摩擦力引起的压力降）的理论计算值、数值结果均与试验结果比较一致；影响扭带压降的因素是流体轴向流速、扭带宽度及扭带节距；流体轴向流速增大，扭带压降也增大；扭带宽度增大，扭带压降也增大；扭带节距增大，扭带压降略有下降。
為瞭直觀地描述內置自鏇扭帶圓管內壓降的特性，採用RNG k-ε湍流模型對內置靜止扭帶、自鏇扭帶圓管及空管的壓降特性進行數值模擬研究，併進行瞭內置3種型號自鏇扭帶圓管壓降特性的數值模擬和試驗研究。研究錶明：自鏇扭帶管的壓力降約為空管的2倍，而靜止扭帶管的壓力降差不多達到空管的3倍；在含有自鏇扭帶或靜止扭帶的管段內，壓力沿軸線方嚮線性變化，與理論分析趨勢一緻；扭帶壓降（流體與自鏇扭帶的摩抆力引起的壓力降）的理論計算值、數值結果均與試驗結果比較一緻；影響扭帶壓降的因素是流體軸嚮流速、扭帶寬度及扭帶節距；流體軸嚮流速增大，扭帶壓降也增大；扭帶寬度增大，扭帶壓降也增大；扭帶節距增大，扭帶壓降略有下降。
위료직관지묘술내치자선뉴대원관내압강적특성，채용RNG k-ε단류모형대내치정지뉴대、자선뉴대원관급공관적압강특성진행수치모의연구，병진행료내치3충형호자선뉴대원관압강특성적수치모의화시험연구。연구표명：자선뉴대관적압력강약위공관적2배，이정지뉴대관적압력강차불다체도공관적3배；재함유자선뉴대혹정지뉴대적관단내，압력연축선방향선성변화，여이론분석추세일치；뉴대압강（류체여자선뉴대적마찰력인기적압력강）적이론계산치、수치결과균여시험결과비교일치；영향뉴대압강적인소시류체축향류속、뉴대관도급뉴대절거；류체축향류속증대，뉴대압강야증대；뉴대관도증대，뉴대압강야증대；뉴대절거증대，뉴대압강략유하강。
In order to visually describe the pressure drop characteristics in a circular tube with self-rotating twisted tape inserts , the RNG k-ε turbulent model was used to simulate the pressure drop characteristics in a circular tube with self-rotating twisted tape , static twisted tape or none inserts . The numerical simulation and experimental study of pressure drop characteristics in a circular tube with 3 types of self-rotating twisted tape inserts were presented .The results indicated that the pres-sure drop of the tube with self-rotating twisted tape is about twice of the empty tube and the pressure drop of the tube with static twisted tape is nearly three times of the empty tube .In the section of tube with self-rotating twisted tape or static twisted tape inserts , the pressure shows a linear variation along the axial direction , which is consistent with the theoretical analysis .The theoretical and nu-merical results of pressure drop caused by friction resistance between the fluid and the twisted tape are consistent with the experimental results .The flow axial velocity , the width and the half-pitch of twisted tape are the factors to the pressure drop of twisted tape .The faster the flow axial velocity , the larger the pressure drops of the twisted tape .The larger the width of the twisted tape , the larger the pressure drop of the twisted tape .With the half-pitch of the twisted tape increasing , the pressure drop of the twisted tape decreases slightly .
