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

Turbine blade trailing edge cooling structure based on double-throat pneumatic thrust vectoring nozzle and wake control method of turbine blade trailing edge cooling structure

A technology of turbine blades and vector nozzles, which is applied to blade support components, engine components, climate sustainability, etc., can solve problems affecting the efficiency of air film cooling, the increase of cooling air temperature, and the decrease of trailing edge cooling efficiency , to improve work efficiency and enhance convective heat transfer

Active Publication Date: 2021-07-13
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
View PDF7 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Turbine trailing edge cooling is one of the difficulties in turbine blade cooling design, mainly because the thickness of the turbine blade trailing edge is thin, the heat load is second only to the blade leading edge, and the available internal cooling space is very limited; the cooling air is first used for the blade leading edge The middle area of ​​the chord length, and then flows through the trailing edge to be discharged. At this time, the temperature of the cooling air increases and the cooling efficiency of the trailing edge decreases
At this stage, spoiler columns or cross ribs are usually used to enhance heat transfer on the trailing edge of turbine blades, but this cooling method will greatly enhance the unsteadiness of the wake, thus affecting the efficiency of film cooling

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
  • Turbine blade trailing edge cooling structure based on double-throat pneumatic thrust vectoring nozzle and wake control method of turbine blade trailing edge cooling structure
  • Turbine blade trailing edge cooling structure based on double-throat pneumatic thrust vectoring nozzle and wake control method of turbine blade trailing edge cooling structure
  • Turbine blade trailing edge cooling structure based on double-throat pneumatic thrust vectoring nozzle and wake control method of turbine blade trailing edge cooling structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] See Figure 1 - Figure 3 This embodiment provides a turbine blade tail edge cooling structure based on the double laryngeal air vector nozzle, including the turbine blade body 1, the turbine blade body 1 is integrally an arc shape, has a shake side and a leafless side, a turbine blade body The inner hollow in the blade has a plurality of gas membrane holes on both sides of the turbine blade body 1, forming a sparse gas film hole, the air film hole in the outer portion and the blade, specifically, the turbine blade can be It is also possible to apply to the movable blades.

[0039] At the tail position of the turbine blade body 1, there is also a double throat pneumatic vector nozzle 2, specifically, if the blade is directly stretched by a two-dimensional line, the vector nozzle should also be stretched directly. If the blade is drawn from the two-dimensional line, the vector nozzle should also be drawn along the particular guide, in sum, in the present embodiment, the relati...

Embodiment 2

[0050] See Figure 1 - Figure 3 The present embodiment provides a trace control method of a turbine blade tail edge cooling structure based on a dual-throat air vector nozzle, which is based on the turbine blade tail edge cooling structure provided in Example 1, including the steps of:

[0051] Step S1, first turn off the first valve 201 and the second valve 202, the high-pressure air gas into the blade, the high pressure air gas is discharged, and the inside and outside wall surface of the turbine blade body 1 is discharged, and the other part of the high pressure air is entered into the mainstream. Nozzle import; at this time, the direction of jet is in the axial direction of the nozzle, and the end is not controlled.

[0052] Step S2, open the first valve 201 or open the second valve 202, wherein when the first valve 201 is turned on, the high-pressure air conditioner passes through the secondary passage 7 of the leaf back, and the internal flow channel is exchanged at a throat ...

Embodiment 3

[0056] See Figure 1 - Figure 3 In the basis of the first embodiment, the present embodiment provides a design method of the relative position of the nozzle outlet and the turbine blade outlet section and its geometric parameters, which specifically includes:

[0057] Step S1, according to the overall demand of the avionics, the cooling gas flow of the blade tail is obtained, and then determine the lactal ratio of the nozzle operation according to the total pressure of the cooling gas stream and the ambient pressure in the blade passage, thereby determining a throat 6 area.

[0058] Step S2, determine the area ratio of the nozzle 6 and the nozzle outlet 10 (diprorson) of the nozzle 6 and the nozzle 10 (diprorson), that is, the outlet height can be out of the nozzle outlet 10 according to the required operating state. The area of ​​the area is determined to the ratio of the blade height.

[0059] Step S3, taking into account the size limitation of the leaf tail edge, material attrib...

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 turbine blade trailing edge cooling structure based on a double-throat pneumatic thrust vectoring nozzle. The double-throat pneumatic thrust vectoring nozzle is further arranged in the turbine blade trailing edge position, two secondary flow channels are symmetrically arranged at two sides of one throat of the thrust vectoring nozzle, one secondary flow channel is close to the blade basin side, and the other secondary flow channel is close to the blade back side. The invention further discloses a wake control method of the turbine blade trailing edge cooling structure based on the double-throat pneumatic thrust vectoring nozzle. The wake control method comprises the steps that firstly, a first valve and a second valve are closed, and high-pressure cold air serves as main flow to enter a nozzle inlet; and then, the first valve or the second valve is opened, the jet flow angle of the thrust vectoring nozzle is controlled through the valves, the control effect of different degrees of the wake is achieved, and therefore the influence of the unsteady wake on the blade film cooling efficiency is reduced.

Description

Technical field [0001] The present invention relates to the field of turbine blade tailing edge cooling technology, and more particularly to the turbine blade of the turbine blade based on the double laryngeatic air vector nozzle and its trace control method. Background technique [0002] With the improvement of air gas turbine efficiency, the turbine inlet gas temperature is constantly increasing, the turbine inlet gas temperature of the air gas turbine engine with 10% of the air gas turbine engine has never nearly 2000K, than high pressure turbine blade metal material The melting point is 400K. The cooling of the modern aircraft high-temperature turbine gas-cooled blade is now substantially formed of a blade cooling scheme consisting of internal cooling and external cooling and thermal barrier coating protection. The inner cooling structure of the blade is very complicated. For different cooling parts of the blades, it can be divided into internal surface impact cooling and con...

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): F01D5/18
CPCF01D5/188Y02T50/60
Inventor 曹明磊徐惊雷黄帅俞凯凯潘睿丰张玉琪成前
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS