Spraying device capable of being used for cooling and purifying tail gas of aero-engine test bed

Abstract

The utility model provides a spraying device capable of being used for cooling and purifying tail gas of an aero-engine test bed. The spraying device comprises a water supply pipe (31), a spraying pipe (32), a connecting base (33) and a hose (34). The spray pipe (32) comprises a connecting flange (35), a straight pipe (36), a plug (37) and a spray head (38); the water supply pipes (31) are arranged in a circle in the circumferential direction of the injection barrel (1), the spraying pipes (32) are directly inserted into the injection barrel (1) through the connecting bases (33), and the six spraying pipes (32) are evenly distributed in the circumferential direction of the injection barrel (1). The straight pipe (36) is connected with the water supply pipe (31) through a hose (34), and a plurality of spray heads (38) are arranged on the straight pipe (36). The exhaust of the test bed is cooled through spraying cooling of the spraying device, so that the influence of high-temperature exhaust on an exhaust structure of the test bed is avoided; by spraying a solution, particulate matters (PM), hydrocarbons (HC) and unburned oil drops in the tail gas are adsorbed, and visible black smoke and peculiar smell in the tail gas are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of tail gas treatment of an aero-engine test bed, and in particular relates to a spray device which can be used for cooling and purifying tail gas of an aero-engine test bed. Background Art

[0002] The exhaust gas of the aircraft engine test bench is mainly produced by the aircraft engine. It has high exhaust temperature and high pollutant concentration. It contains a large amount of particulate matter (PM), hydrocarbons (HC) and unburned oil droplets, which will produce odor and black smoke. The exhaust structure of the test bench cannot withstand the high temperature of the exhaust gas. The exhaust gas of the aircraft engine can be mixed with some air when it is discharged into the exhaust ejector to reduce the exhaust temperature. However, after the engine test, the temperature difference between the inner and outer walls of the ejector due to the high-temperature exhaust gas will still have a great impact on the ejector structure. The exhaust gas needs to be further cooled.

[0003] The exhaust flow rate of aircraft engine test is large, the operating conditions vary complexly, and the exhaust structure of the test bench cannot produce a large exhaust resistance. Traditional exhaust gas treatment methods are unable to treat the exhaust gas of aircraft engine test benches.

[0004] In view of the high temperature and exhaust pollution problems of the exhaust gas from the aircraft engine test bench, a set of practical, simple-to-operate, and low-resistance exhaust gas cooling and purification devices is needed to cool and purify the exhaust gas from the aircraft engine test bench. Utility Model Content

[0005] The utility model provides a spray device which can be used for cooling and purifying the exhaust gas of an aircraft engine test bench. The exhaust gas of the test bench is discharged into an exhaust tower after being mixed with an airflow through an exhaust ejector, and then discharged into the atmosphere by the exhaust tower. The spray device is installed in the exhaust ejector, and sprays a large amount of clean water or solution to cool and purify the exhaust gas discharged by the aircraft engine. The utility model can be applied to an aircraft engine test bench with an exhaust ejector structure.

[0006] The utility model provides a spray device that can be used for cooling and purifying tail gas of an aircraft engine test bench, comprising: a water supply pipe 31, a nozzle 32, a connection seat 33, and a hose 34; the nozzle 32 comprises: a connection flange 35, a straight pipe 36, a plug 37, and a nozzle 38;

[0007] The water supply pipe 31 is arranged outside the exhaust ejector 1 of the aircraft engine test bench and arranged in a circle along the circumference of the exhaust ejector 1. The water supply pipe 31 is used to supply water to the nozzle 32.

[0008] The connection seat 33 is directly fixed on the ejector tube 1, and the nozzle 32 is directly inserted into the exhaust ejector tube 1 through the connection seat 33. Six nozzles 32 form a group and are evenly distributed along the circumference of the ejector tube 1.

[0009] The first end of the straight pipe 36 of the single nozzle 32 is connected to the water supply pipe 31 through a hose 34, and a plug 37 is provided at the second end;

[0010] A connecting flange 35 is provided at the first end of the straight pipe 36, and the connecting flange 35 is connected to the connecting seat 33 by bolts;

[0011] A plurality of nozzles 38 are disposed on the straight pipe 36 .

[0012] Optionally, five nozzles 38 are arranged in the axial direction of each straight pipe 36, so as to evenly divide the cross section of the exhaust ejector tube 1 into five circular rings of equal area;

[0013] After the nozzle 32 is inserted into the exhaust ejector tube 1, the nozzle position is located at the intersection of the center line of each equal-area circular ring and the axial direction of the nozzle.

[0014] Optionally, five nozzles 38 are arranged in the axial direction of each straight tube 36, and the distances from the wall of the exhaust ejector tube 1 are 0.026D, 0.082D, 0.146D, 0.226D, and 0.342D respectively;

[0015] Wherein, D represents the exhaust ejector diameter.

[0016] Optionally, when the diameter of the ejector tube 1 is greater than a preset value, the nozzle 38 uses a wide-angle solid cone nozzle, and when the diameter of the ejector tube 1 is not greater than the preset value, the nozzle 38 uses a standard solid cone nozzle, and the nozzle and the straight pipe 36 are threadedly connected.

[0017] Optionally, two spray devices constitute a spray group;

[0018] The two spray devices of each spray group are arranged front and back, the front spray device is close to the exhaust gas inlet direction and sprays backwards, and the rear spray device is close to the exhaust gas outlet direction and sprays forwards.

[0019] Optionally, two spray groups are arranged on one ejector tube.

[0020] The utility model provides a spray device which can be used for cooling and purifying the tail gas of an aircraft engine test bench. Under the premise of ensuring the normal test of the aircraft engine, the spray device is used for spraying and cooling, so that the tail gas of the test bench is cooled to avoid the influence of the high-temperature tail gas on the exhaust structure of the test bench; by spraying a solution, particulate matter (PM), hydrocarbons (HC) and unburned oil droplets in the tail gas are adsorbed, so that the visible black smoke and odor in the tail gas are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 This is a schematic cross-sectional view of the exhaust portion of the aero-engine test bench of the utility model;

[0023] Figure 2 This is a cross-sectional schematic diagram of the exhaust part after the spray device is installed in the utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the spray device of the utility model;

[0025] Figure 4 This is a schematic diagram of the nozzle structure and nozzle arrangement position of the utility model;

[0026] Description of reference numerals:

[0027] Ejector tube 1, exhaust tower 2, spray device 3, spray device support frame 4;

[0028] Water supply pipe 31 , spray pipe 32 , connection seat 33 , hose 34 , connection flange 35 , straight pipe 36 , plug 37 , spray head 38 . DETAILED DESCRIPTION

[0029] The following is a further introduction to the spray device provided by the utility model and can be used for cooling and purifying the exhaust gas of an aero-engine test bench in conjunction with the accompanying drawings.

[0030] like Figure 1-4 As shown, the exhaust gas of the aircraft engine directly enters the ejector tube 1, enters the exhaust tower 2 along the exhaust structure at the tail of the ejector tube 1, and is directly discharged into the atmosphere from the outlet of the exhaust tower 2.

[0031] A spray device 3 is arranged on the exhaust ejector 1 of the aircraft engine test bench. Spray device support frames 4 are arranged on both sides of the ejector 1. The spray device support frames 4 can be directly fixed on the ground or on a frame for fixing the ejector 1. The spray device support frames 4 are used to support the spray device 3. The spray device 3 is composed of a water supply pipe 31, a nozzle 32, a connecting seat 33, and a hose 34. The nozzle 32 is composed of a connecting flange 35, a straight pipe 36, a plug 37, and a nozzle 38.

[0032] The water supply pipe 31 of the spray device 3 is arranged outside the exhaust ejector tube 1 and arranged in a circle along the circumference of the exhaust ejector tube to supply water to the nozzle 32 .

[0033] The connection seat 33 is directly fixed on the wall of the ejector tube 1, and the nozzle 32 is connected to the ejector tube 1 through the connection seat 33 and directly inserted into the exhaust ejector tube 1. A single nozzle 32 is connected to the water supply pipe 31 through a hose 34. The hose 34 absorbs the vibration of the exhaust ejector tube during the test run and protects the nozzle and the water supply pipe. The nozzle 32 is inserted into the ejector tube 1 perpendicular to the wall of the exhaust ejector tube 1. Six nozzles 32 form a group and are evenly distributed along the circumference. The lower end of the water supply pipe 31 is connected to the liquid supply system pipeline. The spraying solution can cool the exhaust gas of the test bench, absorb particulate matter, hydrocarbons and oil droplets in the exhaust gas, and eliminate the odor of the exhaust gas and visible black smoke.

[0034] The nozzle 32 is composed of a connection flange 35, a straight pipe 36, a plug 37, and a nozzle 38. The connection flange 35 is connected to the connection seat 33 by bolts. The straight pipe 36 passes through the connection flange 35 and the connection seat 33 and is inserted into the ejector tube 1. One end of the straight pipe 36 is connected to the water supply pipe 31 through a hose 34, and the other end inserted into the ejector tube 1 is provided with a plug 37.

[0035] Five nozzles 38 are arranged axially in the straight pipe 36. The arrangement position is determined according to the actual size of the exhaust ejector tube. The cross section of the exhaust ejector tube is evenly divided into five equal-area circular rings. After the nozzle 32 is inserted into the exhaust ejector tube, the nozzle position is located at the intersection of the center line of each equal-area circular ring and the axial direction of the nozzle. The distances between the five nozzles and the wall of the exhaust ejector tube are 0.026D, 0.082D, 0.146D, 0.226D, and 0.342D, respectively, where D represents the diameter of the exhaust ejector tube. This arrangement is conducive to uniform distribution of the spray range.

[0036] The nozzle can be selected according to the exhaust flow rate of the test bench and the diameter of the ejector tube. The large-diameter exhaust ejector tube uses a wide-angle solid cone nozzle with a larger spray diffusion angle, and the small-diameter exhaust ejector tube uses a standard solid cone nozzle. The nozzle and the straight pipe are connected by threads.

[0037] There are two groups of spray devices that can be used for cooling and purifying the exhaust gas of the test bench inside the exhaust ejector. Each group has two spray devices in front and back. The front spray device is close to the exhaust gas inlet direction and sprays backwards, and the rear spray device is close to the exhaust gas outlet direction and sprays forwards. The opposite spray directions can avoid the large resistance of the spray device to the exhaust gas flow due to the spray solution, and will not affect the test of the aircraft engine.

[0038] Each layer of spraying device can be controlled to open and close individually. Before the test run, open the front spraying device first, and then open the rear spraying device after the front spraying device is fully opened. After the test run, close the rear spraying device first, and then close the front spraying device after the rear two layers of spraying devices are fully closed. Avoid the impact of the exhaust backflow of the test bench caused by the spraying water flow on the test workshop.

Claims

1. A spray device that can be used for cooling and purifying tail gas from an aircraft engine test bench, characterized in that: include: A water supply pipe (31), a spray pipe (32), a connecting seat (33), and a hose (34); The nozzle (32) comprises: a connecting flange (35), a straight pipe (36), a plug (37), and a nozzle (38); The water supply pipe (31) is arranged outside the exhaust ejector (1) of the aircraft engine test bench and arranged in a circle along the circumference of the exhaust ejector (1). The water supply pipe (31) is used to supply water to the nozzle (32). The connecting seat (33) is directly fixed on the ejector tube (1), and the nozzle (32) is directly inserted into the exhaust ejector tube (1) through the connecting seat (33). Six nozzles (32) form a group and are evenly distributed along the circumference of the ejector tube (1). The first end of the straight pipe (36) of the single nozzle (32) is connected to the water supply pipe (31) through a hose (34), and a plug (37) is provided at the second end; A connecting flange (35) is provided at the first end of the straight pipe (36), and the connecting flange (35) is connected to the connecting seat (33) by bolts; A plurality of nozzles (38) are arranged on the straight pipe (36).

2. The spray device according to claim 1, characterized in that: Five nozzles (38) are arranged in the axial direction of each straight pipe (36) to evenly divide the cross section of the exhaust ejector tube (1) into five circular rings of equal area; After the nozzle (32) is inserted into the exhaust ejector tube (1), the nozzle head is located at the intersection of the center line of each equal-area circular ring and the axial direction of the nozzle.

3. The spray device according to claim 2, characterized in that: Each straight pipe (36) is provided with five nozzles (38) arranged in the axial direction thereof, and the distances from the wall of the exhaust ejector tube (1) are 0.026D, 0.082D, 0.146D, 0.226D and 0.342D respectively; Wherein, D represents the exhaust ejector diameter.

4. The spray device according to claim 1, characterized in that: When the diameter of the ejector tube (1) is greater than a preset value, the nozzle (38) uses a wide-angle solid cone nozzle; when the diameter of the ejector tube (1) is not greater than the preset value, the nozzle (38) uses a standard solid cone nozzle, and the nozzle and the straight pipe (36) are threadedly connected.

5. The spray device according to claim 1, characterized in that: Two spray devices constitute a spray group; The two spray devices of each spray group are arranged front and back, the front spray device is close to the exhaust gas inlet direction and sprays backwards, and the rear spray device is close to the exhaust gas outlet direction and sprays forwards.

6. The spray device according to claim 4, characterized in that: Two spray groups are arranged on one ejector tube.

Images