Self-circulation electrical momentum law experimental instrument

Abstract

The invention discloses an auto-cycle electric surveying momentum rule laboratory apparatus. It comprises an auto-cycle water provider, a water pump inside the auto-cycle water provider, wherein the auto-cycle water provider is connected with the low port of the constant voltage water tank by up water pipe and low water pipe; it arranges an unsteady water overflow plate, a water stable plate and a working plate in the constant voltage water tank; it opens a water stable hole on the flank of the water stable plate; it arranges a flow exit pipe jet on the working plate; it divides the overflow area, the water stable area, the constant voltage area and the water returning area in the constant voltage water tank; it fixes the impact plane on the flank of the constant voltage water tank; the impact plane is connected with the relay sensor and the electric measurer.

Description

technical field [0001] The invention relates to an experimental measuring instrument, in particular to a self-circulating electric measuring momentum law experimental instrument. Background technique [0002] The law of momentum is one of the basic theories of fluid mechanics and hydraulics, and its momentum equation is the mathematical expression of the law of momentum in theoretical mechanics in fluid mechanics and hydraulics. It reflects the relationship between the momentum change and the force of the fluid motion. Its characteristic is that it is not necessary to know the flow process inside the flow range, but only need to know the flow conditions on its boundary. The interaction force problem between fluid and boundary surface. Therefore, the experiment of the law of momentum is an indispensable content in the teaching process. [0003] Since the distribution of the flow velocity u of the fluid on the cross-flow section is generally difficult to determine, in order ...

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Problems solved by technology

However, the traditional momentum tester has certain disadvantages: first, in order to have a constant pressure water level, a relatively large water supply system and overflow system must be installed, which occupies a large area; It takes a long time and it is difficult to be stable; thirdly, there is inevitably friction between mechanical force measurement and mechanical force transmission mechanisms, or other external force influences, which affect the accuracy of the experiment. Most of the experimental equipment can neither quantitatively verify the law of momentum, nor measure The momentum correction coefficient of the jet; Fourth, the experimental operation is cumbersome and time-consuming, and requires a high water head (5 to 10 meters or more), a large water demand, and high energy consumption

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