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A hierarchical optimization method for multi-stage multi-nozzle ejectors

An optimization method and an ejector technology, which are applied in the ejection field, can solve the problems that the ejector design method cannot be considered, the ejection efficiency is low, and the prediction accuracy is not high, and the development cost is saved, the ejection efficiency is high, and the The effect of bias

Active Publication Date: 2020-04-10
CHINA ACAD OF AEROSPACE AERODYNAMICS
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Problems solved by technology

[0006] The technical problem solved by the present invention is: to overcome the disadvantages that the existing ejector design method cannot consider the shape and layout of the nozzle, the prediction accuracy is not high, and the ejection efficiency is low, and a multi-stage multi-nozzle ejector layered Optimization

Method used

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  • A hierarchical optimization method for multi-stage multi-nozzle ejectors
  • A hierarchical optimization method for multi-stage multi-nozzle ejectors
  • A hierarchical optimization method for multi-stage multi-nozzle ejectors

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Embodiment

[0072] Design conditions: a hypersonic wind tunnel operates with a Mach number of 5-8, the total pressure of the front chamber is 0.8-8.5MPa, the total temperature is 375-750K, and the outlet diameter of the wind tunnel nozzle is 100mm. It is required to design an ejector that meets the operating conditions of the wind tunnel.

[0073] (1) Optimization of the overall parameters of the ejector

[0074] (1.1) Calculate the total boost ratio

[0075] When the wind tunnel Mach number M=5-8, the total pressure of the ejected airflow P 01 It can be estimated according to the formula: P 01 =P 0 σ s / 1.8, where P 0 is the total pressure in the antechamber of the wind tunnel, σ s is the ratio of the total pressure after the normal shock wave to the total pressure before the normal shock wave at the corresponding wind tunnel Mach number, and 1.8 is an empirical coefficient considering various losses. Calculate the total pressure of the ejected airflow and the flow rate of the ejec...

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Abstract

The invention relates to a layered optimization method for a multistage multi-spraying-pipe ejector. The method comprises the following steps: (1) optimizing overall parameters of an ejector: calculating a total pressure ratio; confirming ejection stage quantity and single-stage pressure ratio; assuming a series of ejection area ratio alpha and ejection mach number M'; calculating ejection performance and optimally confirming the ejection parameters; (2) optimizing the ejection nozzle layout: designing the nozzle layout in different nozzle amount and distribution forms, performing numerical simulation and optimally confirming nozzle layout parameters; (3) optimizing the parameters of enhanced mixing ejection spraying pipes: designing the ejection spraying pipes with different tooth amount and invading angles, performing numerical simulation and optimally confirming the nozzle shape parameter. The method disclosed by the invention overcomes the defect of the present ejector design method that the shape and structure layout of the ejection spraying pipes are not considered, can obviously reduce the deviation of the theoretical design and the engineering commissioning, can reduce the technical risk and can save the development and running cost of the ejector system.

Description

technical field [0001] The invention relates to the technical field of ejection, in particular to a layered optimization method for a multi-stage multi-nozzle ejector. Background technique [0002] An ejector is a mechanical device that uses fluid jet mixing for mass and energy transfer. The ejector has no mechanical parts and is easy to use and maintain. It has important application value in military and civilian fields such as wind tunnel drive devices, engine high-altitude test benches, high-energy chemical laser pressure recovery systems, refrigeration equipment, oil and gas transmission, and gas energy conservation. [0003] When the ejector is used for pumping vacuum, the main performance index is the static pressure of the blind cavity; when it is used for pumping low-pressure ejected airflow, the main performance index is the ejection efficiency and pressurization ratio. [0004] The structure of the center ejector is simple, but the mixing chamber is long, the effi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/17
CPCG06F30/17
Inventor 陈培李素循倪招勇刘耀峰
Owner CHINA ACAD OF AEROSPACE AERODYNAMICS
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