Square fractal nozzle based on fractal theory, flow measurement system and heat transfer measurement system

A fractal theory and square technology, applied in the fields of jet devices and fractal geometry, can solve the problems of enhanced mixing performance in the far-field area, limited improvement of entrainment volume and mixing performance in the near-field area, and achieve enhanced turbulence intensity and jet cone angle. Large, stable effect

Pending Publication Date: 2017-08-18
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, only changing the shape of the nozzle within the traditional range can only improve the entrainment capacity and mixing performance in the near-field region, and the enhancement of the entrainment ability in the near-field region does not necessarily enhance the mixing performance in the far-field region.

Method used

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  • Square fractal nozzle based on fractal theory, flow measurement system and heat transfer measurement system
  • Square fractal nozzle based on fractal theory, flow measurement system and heat transfer measurement system
  • Square fractal nozzle based on fractal theory, flow measurement system and heat transfer measurement system

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Effect test

Embodiment 1

[0042] Such as Figure 1-Figure 3 As shown, a square fractal nozzle based on the fractal theory includes a nozzle opening 1 and a fractal frame structure 2, and the fractal frame structure 2 is arranged in an orderly manner according to the square fractal geometric characteristics.

[0043] The part and the whole of the fractal frame structure 2 have self-similarity, the side length ratio of each order of square and the ratio of side length to width of each order are kept constant, L i / L i+1 = 2, L i / L ij =10, where L i Is the side length of the square of order i, L ij Is the width of the side of the i-order square.

[0044] The fractal frame structure 2 includes a square with sizes ranging from 1 to 3 steps;

[0045] In this embodiment, it includes a first-order square 2-1, a second-order square 2-2, and a third-order square 2-3.

[0046] The number of squares of each order is four times the number of squares of the previous order, the side length of each square is one-half of the...

Embodiment 2

[0056] A flow measurement system for a square fractal nozzle based on fractal theory, including an air pump 3 controlled by a frequency converter 8, a honeycomb rectifier 4, a plexiglass gas supply pipeline 5, and a fractal theory-based flow measurement system as described in Example 1. Square fractal nozzle, the horizontal section between the honeycomb rectifier 4 and the air pump 3 is provided with a vortex flowmeter 5-1;

[0057] The flow measurement system also includes a three-dimensional coordinate machine 6, a hot-wire probe 6-1 located on the three-dimensional coordinate machine 6, a hot-wire anemometer 7, a data acquisition card 7-1, and a data processing and controller 9;

[0058] The data processing and controller 9 are respectively electrically connected to the frequency converter 8, the data acquisition card 7-1 and the three-dimensional coordinate instrument 6, the frequency converter 8 is electrically connected to the air pump 3, and the hot wire The probe 6-1 is ele...

Embodiment 3

[0061] A heat exchange measurement system for square fractal nozzles based on fractal theory, which is characterized in that it comprises an air pump 10 controlled by a frequency converter 15, a honeycomb rectifier 11, a plexiglass air supply pipeline 12, and the A square fractal nozzle based on fractal theory, the horizontal section between the honeycomb rectifier 11 and the air pump 10 is provided with a vortex flowmeter 12-1;

[0062] The heat exchange measurement system also includes a three-dimensional coordinate instrument 13, a heat exchange plate 13-1 with a built-in thermocouple temperature probe fixed on the three-dimensional coordinate instrument 13, an Agilent collector 14, a data acquisition card 14-1, and data Processing and controller 16;

[0063] The data processing and controller 16 are respectively electrically connected to the frequency converter 15, the data acquisition card 14-1 and the three-dimensional coordinate instrument 13, the frequency converter 15 is e...

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Abstract

The invention discloses a square fractal nozzle based on a fractal theory, a flow measurement system and a heat transfer measurement system. The square fractal nozzle based on the fractal theory comprises a nozzle mouth and fractal frame structures. The square fractal nozzle is characterized in that the fractal frame structures are arranged in order according to square fractal geometrical characteristics. The flow measurement system adopts a honeycomb steady-flow section having a certain length and a hot-wire anemometer, the heat transfer measurement system adopt a honeycomb steady-flow section having a certain length and a thermocouple collector, and stability of jet itself and accuracy of experiment data can be guaranteed well. Fractal jet formed in the invention has a large jet cone angle, and the turbulent intensity of a fluid and an entrainment ability to surrounding substances are enhanced well. Experiments show that, in an area involved in the fluid, mixing of impact target surface jet can be significantly increased, and a jet heat and mass transfer process is strengthened.

Description

Technical field [0001] The invention relates to the technical field of jet devices and the field of fractal geometry, in particular to a square fractal nozzle, a flow measurement system and a heat exchange measurement system based on fractal theory. Background technique [0002] Among the main energy consumption industries in my country, such as metallurgy, energy, chemical, building materials and other industries, the main form of energy use is industrial boiler combustion. The burner is the main component of power station boilers and industrial boilers. It sends fuel and air required for combustion into the furnace, and organizes a certain airflow structure so that the fuel can catch fire quickly and stably. In terms of enhancing the mixing performance of jet burners, our country is still in its infancy. If certain results are obtained in this area, the structure of the burner injection device can be effectively improved, and the NO in combustion exhaust gas can be reduced. X H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/042G01F1/32G01D21/02F23D14/58
CPCG05B19/042F23D14/58G01D21/02G01F1/32
Inventor 徐敏义薛宇迪陈鹏飞
Owner DALIAN MARITIME UNIVERSITY
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