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变截面管道的使用日益增多,但其摩擦阻力的计算,还缺乏简便正确的方法。过去常用的估算法,其误差值亦未判明。现根据微积分的方法加以分析探讨,可以得出一简便的算式,用来计算变截面风道的摩擦阻力。变截面管道示于附图,管道长l_T;截面小处直径为D_0,截面大处直径为D_1;变截面管道与轴线夹角θ;变截面管道边界线延长与轴线交于0点,0点至小管径处距离为l_0,0点至
The use of variable section pipe is increasing day by day, but the calculation of frictional resistance also lacks the convenient and correct method. The past commonly used estimation method, the error value has not been identified. Now based on the method of calculus analysis and analysis, can be drawn a simple formula, used to calculate the variable section of the air duct frictional resistance. Variable cross-section pipe is shown in the drawings, the pipe length l_T; small cross-section diameter D_0, cross-section diameter D_1; variable section pipe and the axis angle θ; variable section pipe line extension and axis intersect 0:00, 0 To the small diameter of the distance l_0,0 points to