Experimental Research And Empirical Analysis Of Hydraulic Characteristics Of Swirling Internal Energy Dissipator

Combining with "Research on the Vortex Blocking and Vortex Diffusion within the Strong Shear Two-phase Flow Hydraulic Characteristics Characteristic"(National Natural Science Fund Project),and on the basis of the relevant data model,this paper measures and analyzes the wall pressure, swirl angle, cavity diameter under the change of different upstream and downstream water level and different airflow orifice’s diameter .At the same time,according to the related theory and hypothesis,this paper puts forward the feature sections wall pressure relationship theory expressions,and according to the National Natural Science Foundation and relevant experimental research data, it is sorted into empirical expressions.1. Under different conditions,they present the regular with swirl angle along the decrease,cavity diameter along the remained stable,enter the blocking segment to increase,the cavity eccentricity along the periodic change, the pressure to show the fluctuation before Z/D=2,and the pressure along the decrease after Z/D=2.The numerical value of swirl angle is larger under the condition with greater airflow orifice diameter.The free vortex velocity distribution assumption, radical direction momentum conservation law,angular momentum conservation law and the theory of continuity equation and energy equation basecd on the theory of correlation and expression derived in the previous, further infers the relationship expression of generator’s orifice pressure to its characteristic section pressure (1) and the relationship expression of its characteristic section pressure with each other..2. The vortex blocking and vortex diffusion within the strong shear two-phase flow test data alpplied to the above two kinds of theoretical expressions were compared with the measured value of the theoretical value, choose different downstream water levels, different vent aperture as conditions change, the relationship between the application of the theoretical expression of generator’s orifice section and pressure characteristic section of the pressure characteristics of the section are far from the theoretical value and the actual measured value is smaller; the relationship theoretical expressions and using the feature section pressure between each other, in the theory of larger difference between outlet obstruction and the measured value.3.Because expression of relation between pressure of characteristic section is not suitable for large slope shape, So the model test data of large slope as well as free pouring for the application of swirling energy dissipator in the relation between the generator’s orifice outlet pressure and pressure in the characteristic section by choosing different upstream water level with the same blocking ratio(generator orifice area contraction ratio and blocking orifice area contraction ratio)and the same upstream water level with different blocking ratio as changeable conditions.Under the condition of different upstream water level, the theoretical value of three characteristic sections is closed to the measured value. But under the condition of different blocking ratio, the theoretical value is not near to the measured value.