A non-stirred solid-liquid two-phase centrifugal pump internal flow field piv test device

Abstract

The invention discloses an internal flow field PIV (Peak Inverse Voltage) testing device of a stirring-free solid-liquid two-phase centrifugal pump. An outlet pipeline of a test pump is connected with a flushing pipe with a second gate valve and a two-phase circulation pipeline; the tail end of the two-phase circulation pipeline extends into a solid-liquid two-phase energy releaser in a water storage tank; an outlet pipe of the water storage tank is connected with an inlet pipeline of the test pump by virtue of the first gate valve; a primary particle feeding device comprises a sandglass-like particle feeding cup and a conical barrel; the sandglass-like particle feeding cup is arranged at the top of the conical barrel; an inlet pipeline of the primary particle feeding device extends into the sandglass-like particle feeding cup, and an outlet pipeline of the sandglass-like particle feeding cup extends into the conical barrel; The outlet of the conical barrel is communicated with the inlet pipeline of the test pump. The internal flow field PIV testing device is simple in structure, compact in layout, small in noise in an experiment process and less in power consumption, and can be applied to experiments for testing the external characteristics, internal flow field and the like of the pump under a single-phase medium / solid-liquid two-phase flow state, thereby being a multifunctional centrifugal pump PIV experiment testing device applicable to various experiment conditions.

Description

technical field [0001] The invention relates to a centrifugal pump experimental device, in particular to a non-stirring solid-liquid two-phase centrifugal pump internal flow field PIV testing device. Background technique [0002] At present, when the PIV test experiment of the internal flow field of the pump is carried out, the test conditions are complicated, especially when the pump test is carried out under the condition of multiphase flow containing solid particles, the existing experimental device must add a power source to stir in the water storage tank. When the density of the test particles is much larger than the density of the conveying medium, the additional power stirring speed is required to be very high, and the high rotation speed will bring in a large number of bubbles, making the experiment impossible to complete or even fail. Such a device is not only complex in structure, but also has large noise and consumes a lot of electricity during the experiment, an...

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Problems solved by technology

[0002] At present, when conducting the PIV test experiment of the internal flow field of the pump, the test conditions are complicated, especially when the pump test is carried out under the condition of multiphase flow containing solid particles, the existing experimental device must be stirred by an additional power source in the water storage tank The device can make the solid-liquid mix evenly and complete the experiment. When the density of the test particles is much higher than that of the conveying medium, the additional power stirring speed is required to be very high, and the high speed will bring a large number of air bubbles, making the experiment impossible to complete or even fail

Such a device not only has a complex structure, but also has a lot of noise and consumes a lot of power during the experiment, and requires more particles to reach a certain particle volume concentration, which increases the cost of the experiment.

In addition, in the PIV test of the flow field in the pump, it is difficult to ensure that the particle images of the same position and the same flow channel are taken every time. The method of setting the motor speed frequency equal to the shooting frequency often has a large error, because the motor speed It is difficult to stabilize at a fixed value. Even if the motor frequency can be stabilized, it is difficult to obtain particle images of blades at a certain angle every time.

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