CN-122016222-A - Air leakage rate measurement test device and method for low-altitude wind tunnel spraying and ice crystal system

CN122016222ACN 122016222 ACN122016222 ACN 122016222ACN-122016222-A

Abstract

The invention provides a device and a method for measuring and testing the air leakage rate of a low-altitude wind tunnel spray and ice crystal system, and belongs to the technical field of wind tunnel tests. The method aims at solving the problem that the spraying and ice crystal system cannot directly measure the quantity value of gas sprayed into the wind tunnel in the prior art. The invention discloses a wind tunnel body, a wind tunnel test section and a wind tunnel power section, which are sequentially connected, wherein a vacuum system and a refrigerating system are arranged on the wind tunnel body, three pressure transmitters and three temperature transmitters are arranged on the wind tunnel test section along an axis, wherein a second pressure transmitter and a second temperature transmitter are arranged at the middle point of the wind tunnel test section, a first pressure transmitter, a third pressure transmitter and the second pressure transmitter, a first temperature transmitter and a third temperature transmitter are arranged at equal intervals, and a spraying and ice crystal system is arranged between the second temperature transmitter and the third temperature transmitter. The invention solves the problem that the spraying and ice crystal system cannot directly measure the gas spraying quantity value into the wind tunnel in the prior art.

Inventors

QIN WANGSHU
ZHANG YUE
WANG YUNXIANG
MA ZHANYUAN

Assignees

中国航空工业集团公司哈尔滨空气动力研究所

Dates

Publication Date: 20260512
Application Date: 20260410

Claims (6)

1. The device for measuring and testing the leakage rate of the low-altitude wind tunnel spraying and ice crystal system is characterized by comprising a wind tunnel body (1), a wind tunnel test section (11), a wind tunnel power section (12), a spraying and ice crystal system (7), a vacuum system (13) and a refrigerating system (15); The wind tunnel body (1), the wind tunnel test section (11) and the wind tunnel power section (12) are sequentially connected, and a vacuum system (13) and a refrigerating system (15) are arranged on the wind tunnel body (1); The wind tunnel test section (11) is provided with a first pressure transmitter (2), a second pressure transmitter (3), a third pressure transmitter (4), a first temperature transmitter (5), a second temperature transmitter (6) and a third temperature transmitter (9) along the axis, wherein the second pressure transmitter (3) and the second temperature transmitter (6) are arranged at the midpoint of the wind tunnel test section (11), the first pressure transmitter (2), the third pressure transmitter (4) and the second pressure transmitter (3) are arranged at equal intervals, and the first temperature transmitter (5), the third temperature transmitter (9) and the second temperature transmitter (6) are arranged at equal intervals; The spraying and ice crystal system (7) is arranged between the second temperature transmitter (6) and the third temperature transmitter (9).
2. The device for measuring and testing the air leakage rate of the low-altitude wind tunnel spraying and ice crystal system according to claim 1, wherein an air inlet switch valve (8) is arranged between the spraying and ice crystal system (7) and the wind tunnel test section (11).
3. The device for measuring and testing the air leakage rate of the low-altitude wind tunnel spraying and ice crystal system according to claim 2, wherein a high-pressure air regulating valve (10) is arranged between the spraying and ice crystal system (7) and the air inlet switch valve (8).
4. A low-altitude wind tunnel spray and ice crystal system air leakage rate measurement test device according to claim 3, wherein an air extraction regulating valve (14) is arranged between the wind tunnel body (1) and the vacuum system (13).
5. The device for measuring and testing the air leakage rate of the low-altitude wind tunnel spraying and ice crystal system according to claim 1, wherein the first pressure transmitter (2) and the third temperature transmitter (9), the second pressure transmitter (3) and the second temperature transmitter (6), and the third pressure transmitter (4) and the first temperature transmitter (5) are respectively arranged oppositely.
6. The test method of the low-altitude wind tunnel spray and ice crystal system air leakage rate measurement test device according to claim 4, which is characterized by comprising the following steps: S1, starting a fan of a wind tunnel power section (12), enabling a wind tunnel body (1) and a wind tunnel test section (11) to generate air flow, then starting a refrigerating system (15), pulling down the temperature of the air flow in the wind tunnel, measuring the ambient temperature of the wind tunnel test section (11) through a first temperature transmitter (5), a second temperature transmitter (6) and a third temperature transmitter (9) after the temperature is stable, wherein the measured temperatures are T 1 、T 2 and T 3 respectively, and the wind tunnel temperature T wind tunnel =（T 1 +T 2 +T 3 )/3 are the values measured by the wind tunnel test section (11) when the wind tunnel is subjected to the ambient test; S2, establishing a vacuum environment, namely vacuumizing the wind tunnel body (1) through a vacuum system (13) and an air extraction regulating valve (14), and measuring the target pressure P through a first pressure transmitter (2), a second pressure transmitter (3) and a third pressure transmitter (4) according to a formula P=P 0 ×(1-2.25577×10 -5 ×h) 5.25588 , wherein P 0 =101325 Pa, and P is an atmospheric pressure value when the altitude is h; The values measured by the first pressure transmitter (2), the second pressure transmitter (3) and the third pressure transmitter (4) are respectively P 1 、P 2 、P 3 , and then P= (P 1 +P 2 +P 3 )/3; s3, performing pressure maintaining test on the wind tunnel, and simultaneously measuring the air leakage of the wind tunnel at different altitudes in real time, wherein the temperature and the corresponding air density in the wind tunnel at different altitudes are measured in real time, and the calculation process is as follows: ρ Air-conditioner =1.293×（P/P 0 ）×（273.15/K Actual absolute ） ①; K Actual absolute =T wind tunnel +273.15 ②; Wherein ρ Air-conditioner is the air density, P is the barometric pressure value at altitude h, P 0 is the standard physical barometric pressure, and K Actual absolute is the actual absolute temperature; The calculation formula of the air leakage of the wind tunnel is delta m wind tunnel =（ρ 2 -ρ 1 ）V Wind tunnel volume ③; Wherein ρ 1 is the air density of the first sampling, ρ 2 is the air density of the second sampling, V Wind tunnel volume is the wind tunnel volume, Δm wind tunnel is the air leakage rate of the wind tunnel in real time for maintaining pressure; S4, measuring the air leakage rate of the spraying and ice crystal system (7), namely repeating the step S3, starting the spraying and ice crystal system (7) when pressure maintaining is carried out, and adjusting the air inlet rate of the spraying and ice crystal system (7) by opening an air inlet switch valve (8) and a high-pressure air adjusting valve (10), wherein the air quantity delta m Mixing mixed with the spraying and ice crystal system (7) is measured in real time at the moment, and the calculation method is the same as the delta m wind tunnel method; s5, calculating the air leakage rate delta m Spray and ice crystals of the spraying and ice crystal system (7); △m Spray and ice crystals =△m Mixing -△m wind tunnel ④。

Description

Air leakage rate measurement test device and method for low-altitude wind tunnel spraying and ice crystal system Technical Field The invention belongs to the technical field of wind tunnel tests, and particularly relates to a device and a method for measuring and testing the air leakage rate of a low-altitude wind tunnel spray and ice crystal system. Background With the rapid development of aerospace technology, high-altitude extreme environment research is increasingly in progress, wherein the research of high-altitude spray supercooled water drops and ice crystals on the icing of aircraft engines has become an important attack direction in the aviation field of various countries. The low-pressure wind tunnel is used as a core test facility for simulating high-altitude low-temperature low-pressure icing environment, is a key platform for developing such researches, and the stability of the test environment directly determines the reliability of test data. The spraying and ice crystal system can continuously spray a large amount of gas into the low-pressure wind tunnel in the test process, and the quantity of the gas sprayed into the wind tunnel cannot be directly measured due to the characteristics of the design of the spraying and ice crystal system, so that the vacuum system cannot give an optimal matching unit and matching opening degree, and further the control difficulty is increased and unnecessary energy waste is caused In view of the above, there is a need to design a device and a method for measuring and testing the leakage rate of a low-altitude wind tunnel spray and an ice crystal system, which solve the problem that the amount of gas sprayed into the wind tunnel by the spray and ice crystal system cannot be directly measured in the prior art. Disclosure of Invention The following presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. It should be understood that this summary is not an exhaustive overview of the invention. It is not intended to identify key or critical elements of the invention or to delineate the scope of the invention. Its purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is discussed later. In view of this, in order to solve the problem that the magnitude of gas sprayed into a wind tunnel by a spraying and ice crystal system cannot be directly measured in the prior art, the invention provides a device and a method for measuring and testing the leakage rate of the spraying and ice crystal system in a low-altitude wind tunnel. The device comprises a wind tunnel body, a wind tunnel test section, a wind tunnel power section, a spraying and ice crystal system, a vacuum system and a refrigerating system; The wind tunnel body, the wind tunnel test section and the wind tunnel power section are sequentially connected, and a vacuum system and a refrigerating system are arranged on the wind tunnel body; The wind tunnel test section is provided with a first pressure transmitter, a second pressure transmitter, a third pressure transmitter, a first temperature transmitter, a second temperature transmitter and a third temperature transmitter along the axis, wherein the second pressure transmitter and the second temperature transmitter are arranged at the midpoint of the wind tunnel test section, the first pressure transmitter and the third pressure transmitter are arranged at equal intervals with the second pressure transmitter, and the first temperature transmitter and the third temperature transmitter are arranged at equal intervals with the second temperature transmitter; the spray and ice crystal system is disposed between the second temperature transmitter and the third temperature transmitter. Further, an air inlet switch valve is arranged between the spraying and ice crystal system and the wind tunnel test section. Further, a high-pressure air regulating valve is arranged between the spraying and ice crystal system and the air inlet switch valve. Further, an air extraction regulating valve is arranged between the wind tunnel body and the vacuum system. Further, the first pressure transmitter and the third temperature transmitter, the second pressure transmitter and the second temperature transmitter, and the third pressure transmitter and the first temperature transmitter are respectively and oppositely arranged. The second scheme is a test method for measuring the air leakage rate of a low-altitude environment wind tunnel spray and ice crystal system, which is realized by the air leakage rate measurement test device according to the first scheme, and specifically comprises the following steps: S1, starting a fan of a wind tunnel power section to enable a wind tunnel body and a wind tunnel test section to generate air flow, starting a refrigerating system, pulling down the temperature of the air flow in the wind tunnel, measuring the ambient temperature of the