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Two-dimensional support plate integrated structure design method for ejector

A structural design and ejector technology, applied in computer-aided design, instrumentation, calculation, etc., can solve the problems of incapable of ejecting airflow contact and mixing, pipeline vibration, uneven distribution, etc., to achieve small vibration, reduce flow loss, Reasonable effect of force method

Active Publication Date: 2018-08-17
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most of the nozzles used in the technology of multi-nozzle ejectors at home and abroad are "L" type axisymmetric nozzles, and the multi-group nozzles in the ejector are evenly distributed in the flow channel in a single or multi-layer circumferential direction. , these nozzles are fixed at one end, and when the pipe is long, it is easy to generate vibration during work
The ejected air flow will cause a large pressure loss when it flows through the outer walls of multiple groups of nozzles in the channel, and there are defects such as uneven distribution and inability to fully contact and mix with the ejected air flow.

Method used

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  • Two-dimensional support plate integrated structure design method for ejector
  • Two-dimensional support plate integrated structure design method for ejector
  • Two-dimensional support plate integrated structure design method for ejector

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Embodiment 1

[0032] as attached figure 1 with 3 As shown, the present invention proposes an integrated structural design of a two-dimensional support plate for the ejector, the two-dimensional support plate is arranged inside the ejector, and the upper end of the two-dimensional support plate is provided with an upper block Plate 3, the lower end of the two-dimensional support plate is provided with a lower blocking plate 5, and the inside of the two-dimensional support plate is provided with a nozzle air guide chamber 6 for stably supplying the ejected airflow, and the nozzle air guide chamber 6 It is conductively connected with the air inlet 2 of the nozzle air guide chamber for introducing the ejection airflow and the two-dimensional Laval nozzle 4 for deriving the ejection airflow, and the ejection airflow enters from the air inlet 2 of the nozzle air guide chamber into the nozzle air guide chamber 6, then from the nozzle air guide chamber 6 into the nozzle air inlet 7, and flow out a...

Embodiment 2

[0045] as attached figure 1 with 3 As shown, the present invention proposes an integrated structural design of a two-dimensional support plate for the ejector, and the design steps of the two-dimensional support plate are as follows:

[0046] S1, parameter setting of two-dimensional support plate;

[0047] Determine the input parameters of the two-dimensional support plate design according to the structure design parameters of the ejector, the thickness of the two-dimensional support plate is δ=30mm, the height of the two-dimensional support plate is H=350mm, and the Laval nozzle is set The Mach number of the ejected air flow of the pipe 4 is Ma=4, the pressure is P=3MPa, and the Mach number of the ejected air flow of the ejector is set to be 0.4;

[0048] S2, 4-parameter design of the 2D Laval nozzle inside the 2D strut;

[0049] Determine that the thickness of both side walls of the gas outlet of the Laval nozzle 4 is δ o =4mm, determine that the air outlet width of Lava...

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Abstract

The invention provides a two-dimensional support plate integrated structure design method for an ejector, and belongs to the technical field of ejector application. The method adopts an integrated design, and integrates a nozzle air guiding cavity for introducing injection airflow, a two-dimensional Laval nozzle for accelerating the injection airflow and a front end flow guiding section for split-flow of injected airflow into a two-dimensional support plate, and the structure of the two-dimensional support plate is simple, compact and easy to process; the outer contour of the two-dimensional support plate is streamline-shaped, the flow guiding section is arranged at the front end, which can reduce the flow loss when the injected airflow passes through the support plate, and the nozzle airguiding cavity can ensure the stable supply of the ejection airflow; the two ends of the two-dimensional support plate are fixed on the wall surface of the ejector, the force mode is reasonable, the vibration is small during the ejector working process, and the reliability is high.

Description

technical field [0001] The invention belongs to the technical field of ejector structures, and in particular relates to a method for designing a two-dimensional support plate integrated structure for an ejector. Background technique [0002] An ejector is a gas machine that pressurizes a low total pressure airflow by means of a high total pressure airflow. Mechanistically, the ejector transmits the kinetic energy of the ejected airflow to the ejected airflow through the transport of turbulent flow in the mixed layer in contact between the ejected airflow and the ejected airflow to increase the total pressure of the ejected airflow. Effect. Therefore, enhancing the mixing between the ejected airflow and the ejected airflow is a main way to improve the performance of the ejector. There are two ways to enhance the mixing: increasing the mixing area between the ejected airflow and the ejected airflow, and designing the outlet of the special-shaped nozzle to enhance the disturb...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/17G06F2119/06
Inventor 叶伟徐万武李平张富强
Owner NAT UNIV OF DEFENSE TECH
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