CAJ | 학술논문

针对平板通道内非稳定条件下层流的速度分布特点及阻力特性进行了理论和实验研究。基于非稳态条件下平板通道内的数学模型，分析了初始速度分布、压力梯度变化率、加（减）速时间对瞬时速度分布的影响。结果表明：非稳态层流的速度分布特点与通道尺寸、流体性质、压力梯度变化率和加速时间有关；相同截面平均流速条件下，加速情况下的中心流体速度小于稳态的，且加速流动使沿程流动损失增加，减速流动则恰好相反，实验验证结果与理论分析结果符合良好。
침대평판통도내비은정조건하층류적속도분포특점급조력특성진행료이론화실험연구。기우비은태조건하평판통도내적수학모형，분석료초시속도분포、압력제도변화솔、가（감）속시간대순시속도분포적영향。결과표명：비은태층류적속도분포특점여통도척촌、류체성질、압력제도변화솔화가속시간유관；상동절면평균류속조건하，가속정황하적중심류체속도소우은태적，차가속류동사연정류동손실증가，감속류동칙흡호상반，실험험증결과여이론분석결과부합량호。
T he velocity distribution and resistance characteristics of unsteady laminar flow in plate channels were investigated theoretically and experimentally . Based on mathematical model of unsteady laminar flow , the influences of initial velocity distribution ,pressure gradient rate and duration of acceleration (deceleration ) on the instantaneous velocity distribution were analyzed .The results indicate that the velocity distribution of unsteady laminar flow is affected by channel size , fluid properties , pressure gradient rate and acceleration time . Under accelerated flow condition , the center fluid velocity is less than steady-state center fluid velocity , the flow resistance increases with the acceleration flow ,and the deceleration flow is on the contrary .The results of experimental verification show that experimental data agree well with the result of theoretical analysis .