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引言流体的动量方程式是针对流道中连续流体的某一界区(这一界区称“控制体”),应用牛顿第二运动定律导出的,其形式为:∑F=PQ(W_2-W_1) 式中: ∑F——是作用在控制体上的合外力; ρ——流体的密度; Q——流体的体积流量; W_2——流体流出控制面的速度; W_1——流体流入控制面的速度。
INTRODUCTION The fluid momentum equation is derived from a Newtonian second law of motion for a boundary region of a continuous flow in a runner (called the “control body”) in the form of ΣF = PQ (W_2-W_1) Where: ΣF - is the combined force acting on the control body; ρ - the density of the fluid; Q - the volume flow of the fluid; W_2 - the velocity of the fluid flowing out of the control plane; W_1 - speed.