摘要
以压降法、压力脉动法、速度脉动法测定了横肋管中的临界雷诺数Re_C。当峰高k/d为0.01～0.06,间距s/k为7～40时,其值为850～2100。在流动稳定性理论的基础上探讨了峰高、间距及初始扰动等因素对Re_C的影响。
Experimental investigation into the transition from laminar to turbulent flow in traverse ribbed pipes were carried outwithin the range of rib geometry k、d 0.01～0.06, s/k 7～40. The critical Reynolds numbers 850～2100 are determined according to pressure drop law, pressure oscillation phenomenon and velocity fluctuation. The influences of the rib height, spacing and the entering conditions etc on transition are discussed based on flow stability.
基金
国家自然科学基金
关键词
模肋管
压降
压力脉动
临界雷诺数
turbulent flow
laminar flow
pressure drop
velocity fluctuation
critical Reynolds number
oscillation pressure
