CN-122006541-A - Multistage high-low temperature gas blender based on Y-shaped separation structure

CN122006541ACN 122006541 ACN122006541 ACN 122006541ACN-122006541-A

Abstract

The invention provides a multistage high-low temperature gas blender based on a Y-shaped separation structure, and belongs to the technical field of aeroengine test equipment. The blender comprises at least two stages of blending units which are sequentially connected along the airflow direction, wherein each stage of unit comprises a secondary flow cavity cone, a main flow diffusion section cone and a secondary flow pipe orifice which are coaxially arranged in the secondary flow cavity cone. Adjacent units are connected through a Y-shaped separation structure, and the structure comprises a first cone section, a second cone section, a root partition plate for connecting the first cone section and the second cone section and an inner cone ring. An axial thermal expansion gap is reserved between the main stream diffusion section cone and the inner side cone ring. The multi-stage mixing unit is matched with the Y-shaped separation structure, so that the gas wide-temperature-range and high-uniformity mixing is realized, the problem of structural thermal stress under the working condition of large temperature difference is effectively solved, and the multi-stage mixing device has the advantages of compact structure, high reliability, strong expandability and the like.

Inventors

WANG HAOYU
WU XUEWEI
ZHOU QUAN
CAO HAOBO
YU FENG

Assignees

中科航星科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260225

Claims (10)

1. The multistage high-temperature and low-temperature gas blender based on the Y-shaped separation structure is characterized by comprising at least two stages of blending units, a blending gas outlet cylinder (9) and a blending gas pipe orifice (10), wherein the at least two stages of blending units are sequentially connected along the airflow direction, and the blending gas outlet cylinder (9) and the blending gas pipe orifice (10) are positioned at the downstream of the at least two stages of blending units; Each stage of the at least two stages of mixing units comprises a secondary flow cavity cone, a main flow diffusion section cone coaxially arranged in the secondary flow cavity cone and a secondary flow pipe opening arranged on the secondary flow cavity cone and used for introducing secondary flow, wherein the wall of the main flow diffusion section cone is provided with a mixing hole; The two adjacent stages of mixing units are connected through a Y-shaped separation structure (5), wherein the Y-shaped separation structure (5) comprises a first cone part (51) facing the upstream side of the airflow, a second cone part (52) facing the downstream side of the airflow, a root baffle (53) for connecting the first cone part and the second cone part and an inner cone ring (54) positioned on the inner side of the second cone part; the secondary flow cavity cone of the upstream side mixing unit is connected with the first cone part (51) of the Y-shaped separation structure (5), and the secondary flow cavity cone of the downstream side mixing unit is connected with the second cone part (52) of the Y-shaped separation structure (5); Axial gaps for compensating thermal expansion of the structure are reserved between the tail end of the main flow diffusion section cone of the upstream side mixing unit and the inner side cone ring (54) and between the starting end of the main flow diffusion section cone of the downstream side mixing unit and the inner side cone ring (54).
2. The multi-stage high temperature and low temperature gas blender based on a Y-type separation structure according to claim 1, wherein the at least two stages of blending units comprise a first stage blending unit and a second stage blending unit; the first-stage mixing unit comprises a secondary flow I cavity cone (2), a main flow diffusion section cone I (3) coaxially arranged in the secondary flow I cavity cone (2) and a secondary flow I pipe orifice (4); The second-stage mixing unit comprises a secondary flow II cavity cone (8), a main flow diffusion section cone (7) coaxially arranged in the secondary flow II cavity cone (8) and a secondary flow II pipe orifice (6); The Y-shaped separation structure (5) is connected between the secondary flow I cavity cone (2) and the secondary flow II cavity cone (8).
3. The multi-stage high-temperature and low-temperature gas blender based on a Y-type separation structure according to claim 1, wherein the axial gap has a width of 2-5 mm.
4. The multi-stage high temperature and low temperature gas blender based on a Y-separation structure of claim 1 wherein the root partition of the Y-separation structure (5) is the only solid connection connecting its first and second tapered barrel portions such that structural loads are transferred between the first and second tapered barrel portions through the root partition.
5. The multistage high-temperature and low-temperature gas blender based on the Y-shaped separation structure according to claim 1, wherein the secondary flow cavity cone, the Y-shaped separation structure (5) and the blending gas outlet cylinder (9) jointly form a continuous pressure-bearing shell of the blender, and the main flow diffusion section cone is suspended in the pressure-bearing shell and is not rigidly fixed with the pressure-bearing shell.
6. The multi-stage high temperature and low temperature gas blender based on a Y-type separation structure according to claim 1, further comprising a main flow nozzle (1) located at the most upstream side, wherein the main flow nozzle (1) is in communication with the main flow diffuser cone of the most upstream side blending unit.
7. The multi-stage high-temperature and low-temperature gas blender based on the Y-shaped separation structure according to claim 1, wherein the number of the at least two stages of blending units is three or more, and adjacent blending units are connected through one Y-shaped separation structure (5).
8. A method of gas blending using the multi-stage high and low temperature gas blender based on a Y-type separation structure as claimed in any one of claims 1 to 7, comprising the steps of: Introducing a main stream of main stream gas into the main stream diffusion section cone at the most upstream side through a main stream pipe orifice (1); at least two secondary flow gases with the temperature different from that of the primary flow gases are respectively introduced into the corresponding secondary flow cavity cone through the corresponding secondary flow pipe ports; when flowing through the corresponding secondary flow cavity cone, each strand of secondary flow gas passes through the blending holes on the wall of the corresponding main flow diffusion section cone and sequentially merges into the main flow gas flowing through the inside of the main flow diffusion section cone in multiple stages for blending; the uniform mixed gas formed after multi-stage blending is output through the orifice (10) of the blending gas.
9. The method according to claim 8, wherein the root partition and the inner cone ring of the Y-shaped separation structure (5) are capable of thermal deformation when the gas temperatures in adjacent secondary flow chamber cones are different, and the axial gap provides compensation space for the relative thermal expansion between the connected primary flow diffuser cone and inner cone ring.
10. The method according to claim 8, wherein the at least two secondary streams include at least one high temperature gas and at least one low temperature gas, and wherein the wide range of adjustment of the temperature of the mixed gas output from the gas mixing nozzle (10) is achieved by independently adjusting the flow rate of each secondary stream.

Description

Multistage high-low temperature gas blender based on Y-shaped separation structure Technical Field The invention relates to the technical field of aeroengine test equipment, in particular to a multistage high-temperature and low-temperature gas blender based on a Y-shaped separation structure. Background The test bed of the aeroengine is a key ground simulation device for researching aerodynamic and thermal characteristics of each engine. In order to simulate the air inlet conditions under different flying heights and speeds, the test bed is required to mix air flows with different temperatures through a blender so as to accurately adjust and homogenize the air inlet temperature field entering the engine. At present, the main flow mixing structure mainly comprises a pipeline direct mixing structure which can realize multi-path airflow mixing and wide temperature regulation, but has poor temperature uniformity after mixing, long straight pipe sections are often required for improving uniformity, and the occupied space is large, and the main flow mixing structure is a double-layer cavity mixing structure which has good mixing uniformity and is limited by matching of temperature limits and flow rates of main flow and secondary flow, the temperature regulation range in a single test process is narrow, and the wider air inlet working condition simulation requirement of a modern advanced engine is difficult to meet. Therefore, how to design a blender, which can simultaneously consider a wide temperature adjusting range and high blending uniformity, has a compact and reliable structure, can adapt to the thermal stress environment under a large temperature difference, and is a technical problem to be solved in the field. Disclosure of Invention The invention provides a multistage high-low temperature gas blender based on a Y-shaped separation structure, which is used for solving the technical problems that the wide temperature range adjustment and the high-uniformity blending are difficult to realize simultaneously in the prior art, and the thermal stress concentration of the structure is high under the working condition of large temperature difference. In one aspect, the invention provides a multi-stage high-temperature and low-temperature gas blender based on a Y-shaped separation structure, which comprises at least two stages of blending units, a blending gas outlet cylinder and a blending gas pipe orifice, wherein the at least two stages of blending units are sequentially connected along the airflow direction; Each stage of the at least two stages of mixing units comprises a secondary flow cavity cone, a main flow diffusion section cone coaxially arranged in the secondary flow cavity cone and a secondary flow pipe opening arranged on the secondary flow cavity cone and used for introducing secondary flow, wherein the wall of the main flow diffusion section cone is provided with a mixing hole; The two adjacent stages of mixing units are connected through a Y-shaped separation structure, wherein the Y-shaped separation structure comprises a first cone part facing the upstream side of the airflow, a second cone part facing the downstream side of the airflow, a root partition plate for connecting the first cone part and the second cone part and an inner cone ring positioned at the inner side of the second cone part; The secondary flow cavity cone of the upstream side mixing unit is connected with the first cone part of the Y-shaped separation structure, and the secondary flow cavity cone of the downstream side mixing unit is connected with the second cone part of the Y-shaped separation structure; Axial gaps for compensating the thermal expansion of the structure are reserved between the tail end of the main flow diffusion section cone of the upstream side mixing unit and the inner side cone ring, and between the starting end of the main flow diffusion section cone of the downstream side mixing unit and the inner side cone ring. According to the multi-stage high-temperature and low-temperature gas blender based on the Y-shaped separation structure, the at least two stages of blending units comprise a first stage of blending unit and a second stage of blending unit; The first-stage mixing unit comprises a secondary flow I cavity cone, a main flow diffusion section cone I coaxially arranged in the secondary flow I cavity cone and a secondary flow I pipe orifice; the second-stage mixing unit comprises a secondary flow II cavity cone, a main flow diffusion section cone II coaxially arranged in the secondary flow II cavity cone and a secondary flow II pipe orifice; The Y-shaped separation structure is connected between the secondary flow I cavity cone and the secondary flow II cavity cone. According to the multistage high-temperature and low-temperature gas blender based on the Y-shaped separation structure, the width of the axial gap is 2-5 mm. According to the multistage high-low temperature gas blender based on the Y-