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在矩形管道阻力计算中,我国现行的流体力学设计计算方法是采用流速当量直径及流量当量直径换算单位长度摩擦阻力的方法。已有学者证明:对于同一设计条件下的矩形管道,在分别采用流速当量直径和流量当量直径计算管道单位长度摩擦阻力时结论不同。这影响了基于此结论的其他设计结果的最优化。动量当量直径的引入有利于相关领域标准的统一与方便工程上的应用。
In the calculation of rectangular pipe resistance, the current hydrodynamic design and calculation method in our country is a method of converting the frictional resistance per unit length by using the flow equivalent diameter and the flow equivalent diameter. It has been proved by scholars that for rectangular pipes under the same design conditions, the conclusions are different when calculating the frictional resistance per unit length of pipe using flow equivalent diameter and flow equivalent diameter, respectively. This affects the optimization of other design results based on this conclusion. The introduction of momentum equivalent diameter is conducive to the relevant standards in the field of unified and convenient engineering applications.