Study On The Simultaneous Transient And Delayed Transient Properties In The Dynamic System In The Pipe

In the fluid dynamic systems of many industries, transient phenomena may occur frequently. So, presently, it is an important task to explore transient properties of the whole systems, find out the reasons that make the transient occur, presenting methods to prevent and control it. Hereby, this paper made experimental imitation in both adjustable and no adjustable operating modes, during which different water levels in the upper reaches, operation flow, and operation lengths in the experimental device were given. After having made experimental researches and theoretical analyses, this paper presented the concepts of transient intensity and the ration of volume factor to inertia factor. The main contents and conclusions are: the systems show the different transient properties when the different flow and pressures in the upper reaches are set. And that, the transient operating mode can be classified as two kinds: strong transient and weak transient. Transient intensity can be denoted by transient intensity coefficient. The inside factor, that is the ratio of ho to qv0 in the systems, is decisive to make the strong transient occur. Moreover, the smaller the ratio, the more intense the transient will be, in which the adjustable operating mode plays an inductive role. The fluid in a great container possesses property; the moving fluid inpipes possesses an inertia property insteadly. In this paper, water level in the upper tank can be seen as capacitive factor, flow in the pipes can be seen as an inertia factor. Furthermore h0/qv0 denotes the ratio of capacitive factor to inertia factor, and it determines the transient intensity. From the experimental researches and analyses, we found that the transient will occur twice at the same time and after a period of time when the no adjustable operating mode occurs, each of which has a different intensity. We name them as simultaneous transient and delayed transient respectively. This new research results will deepen the study on the transient properties and develop the theory of the transient properties. So it possesses science meaning and factual application value. Furthermore, this paper also point out a direction in reducing the transient intensity and those problems which should be studied fatherly.