【摘要】 对液流通过节流孔的过渡过程进行了数值解析计算。研究了节流孔半径对平均轴速分量w_m、惯性长l、收缩部等效长度δ、流量q_s、再附着点距离Z_ais和时间常数τ_q、τ_z等的影响。对w_m、l、δ、τ_q和τ_s给出简单易算并相当精确的计算式,作出了节流孔半径与w_m、l、δ、q_s、Z_ais、τ_q和τ_x间的关系图。更多还原

【Abstract】 The transient flow through a pipe orifice was studied via numer-ical analysis. Effect of orifice radius on the mean axial velocity componentw_m. the inertial length I, the equivalent length of contraction δ, the flowrate q_x, the distance of reattachment point Z_ais, the time constants τ_q τ_zand so on are discussed. The simple and relatively accurate formulae for w_m,I, δ,τ_q and τ_z are given. The relationships between the orifice radius andw_m, I, δ, q_s, Z_ais, τ_q,τ_z are shown.更多还原