Unlock instant, AI-driven research and patent intelligence for your innovation.

Coupling type casing design method for improving flow of blade top of gas compressor

A design method and compressor technology, which is applied in the field of turbomachinery, can solve the problems that the blade tip leakage vortex and boundary layer separation cannot be suppressed at the same time, and achieve the effects of increasing stall margin, reducing flow blockage, and improving flow conditions

Pending Publication Date: 2022-05-27
XIAN UNIV OF TECH
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a coupled casing design method for improving the flow at the tip of the compressor blade, which solves the problem that the existing technology cannot simultaneously suppress the leakage vortex of the tip of the blade and the separation of the boundary layer, so that the compressor encounters various intake conditions and the problem that it can effectively expand stability under various working conditions

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
  • Coupling type casing design method for improving flow of blade top of gas compressor
  • Coupling type casing design method for improving flow of blade top of gas compressor
  • Coupling type casing design method for improving flow of blade top of gas compressor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] This embodiment takes the NASArotor37 axial flow compressor as the research object. The designed mass flow of the compressor is 20.19kg / s, the rotational speed is 17188rpm, the design pressure ratio is 2.106, the isentropic efficiency is 0.889, the number of blades is 36, the hub-to-hub ratio is 0.7, the tip axial chord length Ca=28mm, and the tip clearance 0.35mm. The distribution of tip leakage flow and axial reversal region of the compressor under near-stall conditions calculated by NUMECA software is given by Image 6 given. Depend on Image 6 It can be seen that there is a large-area flow blockage on the compressor tip, and the blockage is induced by the fragmentation of the tip leakage vortex.

[0058] The coupled casing is optimally designed for this compressor, and the design results are shown in Table 1.

[0059] Table 1 The optimal structural parameters of the coupled casing in Example 1

[0060]

[0061] Figure 4 The pressure ratio and efficiency ch...

Embodiment 2

[0064] This embodiment takes the isolated rotor of a single-stage axial flow compressor of Northwestern Polytechnical University as the research object.

[0065] The designed mass flow of the compressor is 5.6kg / s, the rotational speed is 15200rpm, the design pressure ratio is 1.249, the isentropic efficiency is 0.905, the number of blades is 30, the hub ratio is 0.61, the axial chord length of the blade tip is Ca=18mm, and the blade tip clearance is 0.61. 0.35mm. The distribution of tip leakage flow and axial reversal region of the compressor under near-stall conditions calculated by NUMECA software is given by Figure 8 given. Depend on Figure 8 It can be seen that the compressor tip has a large area of ​​flow blockage, which is induced by the expansion of the tip leakage vortex.

[0066] The coupled casing is optimally designed for this compressor, and the design results are shown in Table 2.

[0067] Table 2 The optimal structural parameters of the coupled casing in E...

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 coupling type casing design method for improving compressor blade tip flow, which is specifically implemented according to the following steps: step 1, carrying out numerical simulation calculation through fluid mechanics software Numeca, setting a boundary condition inlet to be total temperature and total pressure, setting an outlet to be average static pressure, setting a wall surface to be a heat-insulation non-slip boundary, and setting a heat-insulation non-slip boundary to be heat-insulation non-slip boundary to be heat-insulation non-slip boundary to be heat-insulation non-slip boundary to be heat-insulation non-slip boundary to be heat-insulation non-slip boundary; and flow field flow parameter distribution is obtained. And 2, an experiment design DOE method is adopted for optimization, and optimal structural parameters of a certain specific gas compressor are obtained. The coupling type casing design method for improving the compressor blade top flow is simple in principle, the blade top leakage vortex and boundary layer separation are controlled at the same time through the coupling design of the seam, the groove and the nozzle, the stall margin of the compressor is better improved, therefore, the flow blockage of the blade top is reduced, the flow condition in the compressor is improved, and the service life of the compressor is prolonged. And therefore, the purpose of greatly improving the stall margin of the gas compressor is achieved.

Description

technical field [0001] The invention belongs to the technical field of impeller machinery, and relates to a design method of a coupled casing for improving the flow of a compressor blade tip. Background technique [0002] In aero-engines and gas turbines, the compressor is the core component of aero-engines, and stall is a key factor restricting its performance improvement. Improving the stall margin of the compressor has always been an urgent need for the high-performance design of aero-engines. Once the compressor stalls, it will cause the engine to stop in the air at light, and serious accidents such as aircraft crash and death. Therefore, there is an urgent need to explore new design technologies. In order to improve the stall margin of the compressor and ensure the safe operation of the aero-engine and gas turbine. [0003] Case handling has a good ability to improve compressor stall margin. However, casing treatment can greatly reduce compressor efficiency while impr...

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
Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/28G06F30/17F04D29/42F04D29/66G06F111/10G06F113/08G06F119/14
CPCG06F30/28G06F30/17F04D29/4206F04D29/667G06F2111/10G06F2113/08G06F2119/14Y02T90/00
Inventor 王维阎子阳赵珍张乐福卢金玲罗兴锜
Owner XIAN UNIV OF TECH