CN-121994554-A - Aeroengine combustion chamber outlet sample gas sampler

CN121994554ACN 121994554 ACN121994554 ACN 121994554ACN-121994554-A

Abstract

The application belongs to the field of measurement of parameters of an outlet of a combustion chamber of an aeroengine, and particularly relates to a sample gas sampler of the outlet of the combustion chamber of the aeroengine, which adopts a local impingement cooling heat exchange structure, improves the temperature resistance of the windward side of the sampler, and can prolong the service life of the sampler in the process of measuring complex parameters of the outlet of the combustion chamber; the cooling water flow rate is greatly improved, the cooling capacity of the whole structure is improved, the cavity of the mounting seat is designed to cool the mounting seat, and the possibility that the mounting seat is ablated in a high-temperature state is reduced.

Inventors

ZHANG MENG
ZHANG YUGUANG
GAO HONGDA
XIAO TIANMING
HAN YONGYONG
WU ZHENDONG
LI SIMENG
XING ZENGLIANG

Assignees

中国航发沈阳发动机研究所

Dates

Publication Date: 20260508
Application Date: 20260210

Claims (6)

1. The aero-engine combustion chamber outlet sample gas sampler is characterized by comprising a mounting seat (1), a head (2) and a sampling tube (7); the mounting seat (1) comprises a mounting plate and a connecting rod vertically connected to the lower surface of the mounting plate; The mounting seat (1) is internally provided with a cooling water inlet cavity (A) and a cooling water return cavity (B), wherein the cooling water inlet cavity (A) and the cooling water return cavity (B) form openings on the upper surface of the mounting plate, and two cooling water inlet cavities (A) are arranged; The side wall of the connecting rod is connected with a cooling water inlet pipe (3) and a cooling water return pipe (4), wherein two cooling water inlet pipes (3) are communicated with two cooling water inlet cavities (A), and the cooling water return pipe (4) is communicated with a cooling water return cavity (B); the bottom of the head (2) is connected to the upper surface of the mounting plate; The head (2) is of a hollow structure, two water-stop plates (5) are arranged in the head, a cooling flow guide cavity (C) is formed between the two water-stop plates (5) and the side walls at two sides of the head (2), and a cooling reflux cavity (D) is formed between the two water-stop plates (5); The two cooling flow guide cavities (C) are communicated with the cooling reflux cavity (D) through openings at the front position of the head part (2), and the two cooling flow guide cavities (C) form openings at the bottom of the head part (2) and are communicated with openings formed by the two cooling water inlet cavities (A) on the upper surface of the mounting plate; A plurality of guide plates (6) are arranged in the two cooling guide cavities (C), two sides of each guide plate (6) are connected with the water stop plate (5) and the side wall of the head (2), the front end extends to the position of the communication part between the cooling guide cavity (C) and the cooling reflux cavity (D), the rear end extends to the position of the opening part of the cooling guide cavity (C) formed at the bottom of the head (2), and the front end and the rear end are in bending transition; the front windward side of the head (2) is provided with a sampling hole, the front end of the sampling tube (7) is communicated with the sampling hole, and the rear end of the sampling tube passes through the cooling reflux cavity (D) and the cooling reflux cavity (B) to pass out from the end part of the lower end of the connecting rod.
2. The aero-engine combustion chamber outlet sample gas sampler of claim 1, wherein the upper end of the connecting rod is a cylindrical section, and the lower end of the connecting rod is a flat plate section; Two cooling water inlet pipes (3) are connected to the end face of the lower end of the cylindrical section and distributed on two sides of the flat section, and cooling water return pipes (4) are connected to the side wall of one side of the flat section.
3. The aero-engine combustion chamber outlet sample gas sampler according to claim 2, wherein there are a plurality of sampling tubes (7) and their corresponding sampling holes.
4. An aero-engine combustion chamber outlet sample gas sampler according to claim 3, characterized in that the individual sampling tubes (7) are equally diametrically and equally spaced or equally annularly distributed.
5. An aero-engine combustion chamber outlet sample gas sampler according to claim 3 in which each sampling aperture is vertically distributed.
6. The aero-engine combustion chamber outlet sample gas sampler according to claim 5, wherein the cooling water inlet pipe (3) is a phi 10 water pipe, and the cooling water return pipe (4) is a phi 14 water pipe.

Description

Aeroengine combustion chamber outlet sample gas sampler Technical Field The application belongs to the field of measurement of parameters of an outlet of an aero-engine combustion chamber, and particularly relates to an aero-engine combustion chamber outlet sample gas sampler. Background Aero-engines develop in the direction of high temperature rise and high thrust, and the demands for measuring the outlet parameters of combustion chambers are increasing. The average temperature of the combustion chamber outlet of the advanced engine is up to 2000K, and the traditional thermocouple and probe measurement mode is difficult to adapt to the measurement requirement of the combustion chamber outlet parameters. In recent years, the gas analysis measurement method is gradually applied to the measurement of the outlet parameters of the combustion chamber of the aero-engine, and the technology is basically mature. The gas analysis and measurement method adopts a high-temperature and high-pressure resistant sampler to collect the sample gas at the outlet of the combustion chamber, and obtains the data of the outlet temperature of the combustion chamber, pollutant emission, soot and the like by analyzing CO, CO2, NOx and UHC (unburned hydrocarbon) in the sample gas. The current sample gas sampler for analyzing and measuring the parameter gas of the combustion chamber of the aeroengine has the following defects: The forced convection heat exchange cooling mode is adopted, a plurality of partition boards are arranged in the cavity to guide cooling water to circulate, and as the number of the partition boards is large, the cooling water can generate a backflow area at a large turning angle position, the flow speed of the cooling water in the backflow area is small, the heat exchange effect is poor, the overheat ablation is easy to occur, the mounting seat is lack of a cooling structure, the mounting seat is easy to be ablated and damaged, the test is easy to be stopped, and the test efficiency is affected; the diameter of a cooling water pipeline in the sampler is small due to size limitation, the cooling water flow is small, the integral cooling requirement cannot be met, the local cooling effect is poor, the local temperature is high, and the service life is short; The internal structure is complex, all materials are high-temperature alloy, the machining difficulty is high, the cost is high, and the problems of bulge deformation and the like are easy to occur. The present application has been made in view of the above-described technical drawbacks. Disclosure of Invention It is an object of the present application to provide an aeroengine combustion chamber outlet sample gas sampler that overcomes or alleviates at least one of the known technical drawbacks. The technical scheme of the application is as follows: An aeroengine combustion chamber outlet sample gas sampler comprises a mounting seat, a head part and a sampling tube; the mounting seat comprises a mounting plate and a connecting rod vertically connected to the lower surface of the mounting plate; The mounting seat is internally provided with a cooling water inlet cavity and a cooling water return cavity, and the cooling water inlet cavity and the cooling water return cavity form openings on the upper surface of the mounting plate, wherein two cooling water inlet cavities are arranged; The side wall of the connecting rod is connected with two cooling water inlet pipes and two cooling water return pipes, wherein the two cooling water inlet pipes are communicated with the two cooling water inlet cavities; the bottom of the head is connected to the upper surface of the mounting plate; the head part is of a hollow structure, two water-stop plates are arranged in the head part, a cooling flow guide cavity is formed between the two water-stop plates and the side walls on two sides of the head part, and a cooling reflux cavity is formed between the two water-stop plates; the two cooling flow guide cavities are communicated with the cooling reflux cavity at the front position of the head through openings, and the two cooling flow guide cavities form openings at the bottom of the head and are communicated with openings formed by the two cooling water inlet cavities on the upper surface of the mounting plate; A plurality of guide plates are arranged in the two cooling guide cavities, two sides of each guide plate are connected with a water stop plate and the side wall of the head, the front end of each guide plate extends to a communication part between the cooling guide cavity and the cooling reflux cavity, the rear end of each guide plate extends to an opening part formed at the bottom of the head of the cooling guide cavity, and the front end and the rear end of each guide plate are in bending transition; The front windward side of the head is provided with a sampling hole, the front end of the sampling tube is communicated with the sampling hole, and the rear end of