Torque balance momentum law experimental device

Abstract

The invention discloses a torque balance momentum law experimental device. The experimental device comprises a water storage tank and a working water tank arranged over the water storage tank, wherein the bottom opening of the working water tank is communicated with the water storage tank; the side wall of the working water tank is provided with a nozzle, a speed-adjustable water pump is arrangedin the water storage tank; the outlet end of the speed-adjustable water pump is connected with the nozzle by a water pipeline; the water pipeline is provided with a flowmeter; a fulcrum is arranged over the working water tank, an L-shaped lever is arranged on the fulcrum; a corner end of the L-shaped lever extends into the working water tank; the head of the corner end of the L-shaped lever is provided with a striking plate corresponding to the nozzle; the other end of the L-shaped lever is connected with one end of a support bar by an adjustable nut; a level bubble is arranged on the L-shaped lever, the other end of the support rod presses an electronic scale, and the striking plate is a flat or a spindle shell or a hemispherical shell. In the invention, a self-circulation water system is utilized, a method of lever torque balance is initiated, and a high precision electronic scale is initially adopted to directly measure the momentum force, thereby the torque balance momentum law experimental device is visual and intuitive. The invention is convenient to teach without the influence of the external force, and the data is more actual and reliable.

Description

technical field [0001] The invention relates to an experimental measuring instrument, in particular to a torque balance momentum 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 fluid flow velocity u on the flow section is generally difficult to determine, in order to simplify the research, in engineering p...

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Problems solved by technology

[0004] At present, the experimental teaching of the law of momentum based on fluid mechanics has relatively few experimental devices, both domestically and internationally, and some of the experimental devices are unreasonable, especially the use of manual or mechanical force measurement methods. The disadvantages of the experimental device are as follows: first, the method is not intuitive enough, and the experimental operation is cumbersome and time-consuming, and the adjustment of the device is cumbersome and difficult to be accurate, which does not directly help the understanding of the concept of conservation of momentum; The device takes a long time to balance, it is extremely difficult to stabilize, and the accuracy is greatly disturbed by human factors; third, the mechanical force measurement device is used, and there is inevitably friction between the mechanical force transmission mechanisms, and the mechanism is subject to wear for a long time, or other external forces. Affecting the accuracy of the experiment, most of the experimental equipment can neither quantitatively verify the law of momentum, nor measure the value of the momentum correction factor β of the jet

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