Matching calculation method for centrifugal impeller and diffuser under pre-swirl air intake condition

A technology of centrifugal impeller and matching calculation, which is applied in the fields of calculation, instrument, special data processing application, etc., can solve the problems of matching research between centrifugal impeller and diffuser, etc., and achieve the effect of wide stable working condition range and high entropy efficiency.

Active Publication Date: 2018-09-28
TIANJIN UNIV
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above research results are only for the specific situation of axial intake, and there is no relevant report on the matching of centrifugal impeller and diffuser under the condition of any pre-swirl intake angle (including axial intake)

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Matching calculation method for centrifugal impeller and diffuser under pre-swirl air intake condition
  • Matching calculation method for centrifugal impeller and diffuser under pre-swirl air intake condition
  • Matching calculation method for centrifugal impeller and diffuser under pre-swirl air intake condition

Examples

Experimental program
Comparison scheme
Effect test

specific example

[0065] This example combines the design and matching process of an industrial pressure-sonic centrifugal compressor to demonstrate the matching calculation method of the centrifugal impeller and the diffuser under the pre-rotation air intake:

[0066] 1) Given air medium characteristic parameters: adiabatic index γ=1.4, gas constant R=287J / (kg k); given centrifugal impeller design parameters: centrifugal impeller inlet pre-rotation angle α 1 =30deg, the relative axial airflow angle β of the centrifugal impeller inlet wheel cover 1s =39.8deg, the relative Mach number M of the inlet wheel cover of the centrifugal impeller w1 =0.5114, the total pressure ratio ε=2.0

[0067] 2) Calculate the normalized impeller blocking flow according to the formula (1) of the present invention

[0068]

[0069] Normalized impeller blocking flow It is a function of the local machine Mach number Mu, which essentially reflects that the area of ​​the blocked throat of the centrifugal impeller changes along...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a matching calculation method for a centrifugal impeller and a diffuser under a pre-swirl air intake condition. The method comprises the steps of giving air medium characteristic parameters including an adiabatic exponent and a gas constant; giving centrifugal impeller design parameters including a centrifugal impeller inlet pre-swirl angle, a centrifugal impeller inlet wheel cap relative axial airflow angle, a centrifugal impeller inlet wheel cap relative Mach number and a total pressure ratio; calculating normalized diffuser blockage flow; calculating normalized diffuser blockage flow; calculating a ratio of a diffuser blockage throat area to a centrifugal impeller blockage throat area when the centrifugal impeller is completely matched with the diffuser; giving centrifugal impeller inlet total parameters including an inlet total temperature, an inlet total pressure and given designed blockage flow; calculating centrifugal impeller inlet total density and inlet stagnation sound velocity; calculating the diffuser blockage throat area when the centrifugal impeller is completely matched with the diffuser; and calculating a change law of the centrifugal impeller blockage throat area along with a flow position when the centrifugal impeller is completely matched with the diffuser. A centrifugal air compressor manufactured by the method has higher isentropicefficiency and a wider stable working condition range.

Description

Technical field [0001] The invention relates to a design of the flow channel area of ​​a centrifugal compressor. In particular, it relates to a calculation method for matching a centrifugal impeller and a diffuser under pre-swirl air intake. Background technique [0002] Centrifugal compressors are widely used in aero engines, ground gas turbines, automotive and marine turbochargers, petrochemical compressors, and play an irreplaceable role in national defense, civil industry and other fields. The core components of a centrifugal compressor include a centrifugal impeller, a diffuser, etc. The design methods of each individual component are becoming more mature and the design results are satisfactory, but there are few studies on the matching of the centrifugal impeller and the diffuser. Practical experience shows that a single impeller has a higher efficiency and pressure ratio and a wide range of stable operating conditions. Once matched with a diffuser, its efficiency and pres...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G06F17/50
CPCG06F30/17
Inventor 李孝检刘正先
Owner TIANJIN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap