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目前在求介不稳定流的各种方法中,瞬态法仍是常用的具有实用价值的一种方法。但这类方法为了简化计算,一般多系忽略基本微分方程中的部分或全部惯性项,这样就使方法的应用范围受到了一定的限制。此外对不稳定流的两个基本微分方程在取有限差形式以后,系绘制由连续方程与动力方程两族曲线相交组成的所谓线介图或者性质类似的某种曲线图来求介,在只要求计算少数时段时,绘制上述的线介图,其工作量就显得颇为浩繁。至于也有对两个基本方程完全采用试算求介的办法,其计算程序,亦不免失之繁琐。
Among various methods of seeking unstable flow at present, the transient method is still a commonly used method with practical value. However, in order to simplify the calculation of this kind of method, most systems ignore some or all of the inertial terms in the basic differential equation, which limits the application range of the method. In addition, for the two basic differential equations of instability flow, after taking the finite difference form, we draw the so-called line graph composed of the intersection of two series curves of continuous equation and dynamic equation or some kind of graph with similar properties. When it comes to calculating a few hours, drawing the above linemap takes a lot of work. As for the two basic equations, we have adopted the method of trial calculation completely, and the calculation procedures are also inevitably cumbersome.