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Jet pump design method based on theoretical model and CFD correction

A technology of theoretical model and design method, applied in the field of jet pump, to achieve the effect of shortening the design cycle, reducing the design cost and improving the consistency

Inactive Publication Date: 2021-10-22
NANJING VOCATIONAL UNIV OF IND TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a jet pump design method to solve the existing defects in the design process

Method used

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  • Jet pump design method based on theoretical model and CFD correction
  • Jet pump design method based on theoretical model and CFD correction
  • Jet pump design method based on theoretical model and CFD correction

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Embodiment Construction

[0047] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0048] 1. Technical indicators. The jet pump mainly relies on the high-pressure working fluid to transfer energy to the low-pressure ejection fluid, and finally discharges it with a certain pressure. Therefore, its main performance indicators include pressure ratio and pressure ratio h as:

[0049]

[0050] The jet ratio q is:

[0051]

[0052] where P p ,P s ,P c Respectively represent the inlet, suction, outlet pressure, Pa; Q S , Q P It is the flow rate of the suction port and the mass flow rate of the working fluid, in kg / s.

[0053] Therefore, the goal of jet pump design is to obtain a higher jet ratio with a lower pressure ratio, which saves a lot of energy. figure 2 It is a schematic representation of each parameter in the je...

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Abstract

The invention discloses a jet pump design method based on a theoretical model and CFD correction, and relates to the technical field of jet pumps, and the jet pump design method comprises the steps of S1, calculating the pressure ratio h and the jet ratio q of a jet pump, S2, calculating the sectional area of a nozzle, S3, calculating the area ratio m, S4, calculating the distance S between the nozzle and a mixing chamber, and S5, calculating other parameters according to given parameters and the size of a three-end interface of the jet pump, and S6, adopting numerical simulation is to further optimize the structure parameters of the jet pump. A theoretical model and a test coefficient method are adopted to determine a parameter model for the main structure parameters influencing the jet pump, meanwhile, a computational fluid mechanics simulation analysis method is adopted to capture an internal flow field of the jet pump, and according to design input of the pressure ratio, the jet ratio is calculated in a simulation mode. And compared with a design value, the method has good coincidence, the design period is greatly shortened, and the design cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of jet pumps, and in particular relates to a jet pump design method based on theoretical models and CFD correction. Background technique [0002] The jet pump mainly includes jet nozzle 3, receiving chamber 1, diffusion pipe 4 and suction pipe 2, and the flow path of the diffusion pipe is divided into mixing chamber 4-1 and diffusion chamber 4-2 ( figure 1 shown). The Venturi principle is mainly adopted, the high-pressure fluid is ejected through the nozzle at a high speed, and the air in the receiving chamber is sucked away to create a vacuum, and the low-pressure liquid is sucked into the receiving chamber under the action of atmospheric pressure, and is evenly mixed with the high-pressure fluid in the mixing chamber And after boosted by the diffusion tube, it enters the downstream pipeline or is discharged. [0003] The structure of the jet pump is simple, but its internal fluid phase change and flow fi...

Claims

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Application Information

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IPC IPC(8): G06F30/18G06F30/28G06F111/10G06F113/08G06F113/14G06F119/14
CPCG06F30/18G06F30/28G06F2111/10G06F2113/08G06F2113/14G06F2119/14
Inventor 周良富朱楠楠周彬彬施琦
Owner NANJING VOCATIONAL UNIV OF IND TECH