Direct measurement device for unsteady state force of loading and fixing particle swarm of shock wave

Abstract

The invention discloses a direct measurement device for the unsteady state force of a loading and fixing particle swarm of a shock wave. A high-pressure air source is connected with a shock wave pipe, small holes distributed in an equational manner are processed at a same radial section of a test section, one end of a wire penetrates through the small holes for connecting particle models in series to form a spherical array model which is fixed in the holes of the test section, a fixed base is arranged below the test section, four connecting rods penetrate through an upper cover plate of the fixed base so that a cage-shaped support top cover and a cage-shaped support bottom cover are fixedly connected with each other, one end of a pressure sensor penetrates through the upper cover plate of the fixed base to the cage-shaped support bottom cover, oil is filled among inner holes of the bottom cover, the pressure sensor is connected with a high-speed data collection system, the other end of the wire penetrates through a central hole of the cage-shaped support top cover to be fixed, and a probe of a dynamic dynamometer is connected with one end of the wire by another wire and a ring buckle. The device can be used for directly measuring the unsteady state force of the loading and fixing particle swarm of the shock wave, so that the researches on an interaction mechanism of the shock wave and the particle swarm and two-phase stream features induced by the shock wave are developed.

Description

technical field [0001] The invention relates to an experimental device for measuring force, in particular to a shock wave-loaded fixed particle group unsteady-state force direct measurement device for the interaction between shock wave and particle group and compressible gas-solid two-phase flow. Background technique [0002] The phenomenon of gas-solid two-phase flow in transonic and supersonic airflow involves many important fields such as fluid machinery, safety prevention and control, medical equipment, aerospace, etc., and the establishment of an accurate mathematical model of the particle group force is a problem that the academic community cares about and strives to solve , It is also the basis for the realization of technology research and development and engineering applications in related fields. Supersonic and transonic gas-solid two-phase flows are usually accompanied by shock waves, which involve dynamic issues such as the interaction between shock waves and par...

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Problems solved by technology

There are two main ways to study the particle force at home and abroad. One is to obtain the gas phase flow field parameters based on the particle model combined with theoretical modeling and numerical calculation, and use the integral relationship of force, compressive stress and shear stress to determine the particle force. Due to the limitation of the amount of calculation, it is only applicable to the case of a very small number of particles; the second is to carry out experiments on the particle model to test the particle force. At present, the optical method is mainly used for measurement, that is, based on the moving images of particles (groups) captured by high-speed photography, to obtain Acceleration, and then determine the particle (group) force, this method has the defect that the flow field parameters cannot be stably controlled, and it is difficult to obtain an accurate resistance coefficient relational expression. In addition, the direct force measurement for a single ball ensures the flow field parameters. stable, but the result fails to consider the impact of the mutual interference between the shock wave structure and the wake vortex structure between adjacent particles, and there must be a certain essential deviation when directly applied to the particle group situation

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