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

A Jet Experimental Device for Simulation of Turbine Tip Leakage Flow

An experimental device and turbine technology, applied in the field of turbines, can solve problems such as inability to apply high-precision calculation methods and lack of data support, and achieve simple geometry and boundary conditions, flexible and changeable experimental conditions, and easy realization

Active Publication Date: 2020-06-26
BEIHANG UNIV
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the existing computing power, research can only be carried out by means of Reynolds averaging (RANS), but cannot be applied to high-precision computing methods such as DNS and LES
This has led to the lack of necessary data support in the mechanism research of tip leakage flow, which has brought many problems to turbine flow simulation and design optimization.

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
  • A Jet Experimental Device for Simulation of Turbine Tip Leakage Flow
  • A Jet Experimental Device for Simulation of Turbine Tip Leakage Flow
  • A Jet Experimental Device for Simulation of Turbine Tip Leakage Flow

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] When in use, the entrance of the main channel 1 is connected with a wind tunnel device, and the jet nozzle 3 is introduced into the jet fluid by another set of devices, and the direction of the jet flow is perpendicular to the direction of the main flow or at a certain angle. After the jet enters the main flow, it shears with the main flow and is restricted by the upper wall and the opposite wall to form a flow direction vortex. Cooperating with measuring devices, such as PIV, LDV, hot wire, probe, etc., the flow field in the channel can be obtained, so as to study the shear mechanism, flow structure, turbulence mechanism, etc. in the leakage vortex.

[0025] Such as Figure 4 , Figure 6 As shown, the numerical simulation results show that after the fluid injected from the slit enters the main flow, it forms a rushing vortex and develops downstream with the main flow, which is consistent with Figure 5 , Figure 7 The flow field of the tip leakage flow of the real r...

Embodiment 2

[0027] This embodiment is basically the same as Embodiment 1, except that the working medium of this embodiment is liquid, and when in use, a water pump and other devices are connected to the inlet of the main channel 1 .

Embodiment 3

[0029] This embodiment is basically the same as Embodiment 1, except that the flow channel of this embodiment is an expanded flow channel. When in use, the change of the flow channel area causes a reverse pressure gradient, which can be used to study the effect of the reverse pressure gradient on the leakage vortex. influences.

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 belongs to the turbine technical field and provides a jet flow experimental device for simulating turbine blade tip leakage flow. According to the experimental device, an experimental section main flow channel is a square cavity; a slit is formed at the top end of the side surface of the middle of the square cavity; the slit is externally connected with a jet flow device; jet flow is perpendicular to or forms a certain angle with main flow; after entering the main flow, the jet flow is mixed with and sheared with the main flow so as to form a streamwise vortex due to the wall surface of the main flow channel, and the streamwise vortex develops downstream with the main flow, and therefore, the formation and development mechanism of a turbine blade tip leakage vortex can be simulated; and by means of the cooperation of measuring instruments, a flow phenomenon in an experiment can be studied. According to the jet flow experimental device of the invention, simple flow is constructed, irrelevant factors are eliminated, and therefore, a user can concentrate on and research a jet flow-main flow shear mechanism in the leakage flow. The jet flow experimental device of the invention has the advantages of easiness in implementation and low cost. Experimental conditions are flexible, experiments can be carried out for flow of different Reynolds number; and geometric and boundary conditions are simple, and therefore, conditions can be provided for high-precision calculation.

Description

technical field [0001] The invention relates to the technical field of turbo machines, and provides a jet flow experimental device for simulating the leakage flow of the tip of the turbo machine. Background technique [0002] Due to the deformation caused by the centrifugal force when the aero-engine rotates at high speed, the deformation of the rotor stator caused by the temperature change during operation, the free bearing, aerodynamic load, processing and assembly technology and other factors, it is necessary to reserve enough blades between the engine rotor and the casing. point clearance so that they do not rub against each other during normal operation. Due to the pressure difference between the pressure surface and the suction surface of the blade and the existence of the tip clearance, there will be a tip leakage flow in the turbine, and the leakage flow interacts with the cross flow of the impeller channel, resulting in leakage loss, the impeller’s working ability i...

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 Patents(China)
IPC IPC(8): G01M10/00
CPCG01M10/00
Inventor 柳阳威高雁飞陆利蓬
Owner BEIHANG UNIV