Rain suction device for aeroengine tests and aeroengine rain suction test system

Abstract

The present invention discloses a rain suction device for aeroengine tests and an engine rain suction test system, including: an installation bracket vertically erected, a rain suction device arranged on the installation bracket, and a plurality of nozzles for jetting liquid water out in a swirling manner. The rain suction device is also connected with a rainwater supply device to supply liquid water meeting the requirements of flow rate, water quality and pressure to the rain suction device. The nozzles are connected to the rain suction device and are evenly spaced along the median line of the engine intake section, so that the liquid water is evenly sprayed into the intake section. The rain suction device of the present invention has strong versatility and convenient operation. By replacing different rain suction devices and nozzles, it can meet the rain suction airworthiness verification requirements of different types of engines, including turboshaft engines with a power front output structure. The present invention has been applied to the whole-machine rain suction airworthiness scientific research test of a certain civil turboshaft engine with a power front output structure. The inhaled rain is evenly distributed on the intake duct plane, and the test results meet the requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of rain ingestion verification for rotary-wing aircraft engines. In particular, it relates to a rain ingestion device for aviation engine tests. In addition, the present invention also relates to an engine rain ingestion test system having a rain ingestion device for aviation engine tests. Background Art

[0002] In order to ensure that the engine can operate reliably in rainy weather without having an adverse impact on the engine's operation, the Civil Aviation Administration of China's airworthiness regulations, "Airworthiness Regulations for Aeroengines" (CCAR-33-R2), clearly stipulate the requirements for rain ingestion of aeroengines. Article 33.78(b) thereof details the uniformity of rain ingestion for rotary-wing aircraft engines: the inhaled rain is evenly distributed on the intake plane.

[0003] Currently, there is no domestically independently innovated civil aeroengine that has obtained an airworthiness certificate, and there is relatively little publicly available information on rain ingestion airworthiness compliance verification technology. Especially for an aero-turboshaft engine with a front power output structure, since the intake plane is an annular surface, compared with other engines for the uniform distribution of rainwater, the design of the rain ingestion device is more difficult. Therefore, innovatively designing a rain ingestion device applicable to civil aero-turboshaft engines that meets airworthiness requirements is the prerequisite and key for the rain ingestion airworthiness compliance verification work of civil rotary-wing aircraft engines.

[0004] There are limited similar foreign devices and methods for reference, and most are non-adjustable and temporarily fabricated parts. Due to non-adjustability, there are problems of poor adaptability and inconvenient operation. Summary of the Invention

[0005] The present invention provides a rain ingestion device for aviation engine tests and an engine rain ingestion test system to solve the technical problems of relatively little publicly available information on rain ingestion airworthiness compliance verification technology at home and abroad and the great design difficulty of the rain ingestion device.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A rain ingestion device for aviation engine tests includes: a mounting bracket vertically erected, a rain collector disposed on the mounting bracket, and a plurality of nozzles for ejecting liquid water outward in a swirling manner; the rain collector is also connected to a rainwater supply device to supply liquid water meeting the requirements of flow rate, water quality, and pressure to the rain collector; the nozzles are connected to the rain collector and are evenly spaced along the median line of the engine intake section so that the liquid water is evenly sprayed into the intake section.

[0008] Further, the rain absorber includes a hollow annular rain absorption ring and a plurality of nozzle mounting pipes respectively corresponding to a plurality of nozzles; the median diameter of the inner ring cavity of the rain absorption ring is equal to the median diameter of the air intake cross-sectional ring surface; the plurality of nozzle mounting pipes are located on the first side of the rain absorption ring and are evenly spaced along the median diameter line of the inner ring cavity of the rain absorption ring, and each nozzle mounting pipe is vertically communicated with the rain absorption ring; the nozzles are detachably connected to the correspondingly arranged nozzle mounting pipes.

[0009] Further, the rain absorption ring includes a left rain absorption half ring and a right rain absorption half ring arranged in an arc tube; the first ends and the second ends of the left rain absorption half ring and the right rain absorption half ring are respectively detachably connected into a ring through a guiding connection structure therebetween.

[0010] Further, the nozzle mounting pipe is a hollow pipe, its first end is perpendicular to the rain absorption ring and is fixedly welded to the rain absorption ring, and its opposite second end is processed with internal threads; the correspondingly arranged nozzles are threadedly connected to the second ends of the nozzle mounting pipes.

[0011] Further, the nozzle includes a nozzle head, a nozzle connection pipe coaxially communicated with the nozzle head, a sealing piece sleeved on the outer circle of the nozzle connection pipe, and a cyclone arranged in the nozzle head; external threads are processed on the outer circle of the nozzle connection pipe, and the nozzle is detachably fixed to the nozzle mounting pipe through the connection of its external threads and the internal threads of the nozzle mounting pipe; the sealing piece is pressed between the end of the nozzle head and the end face of the nozzle mounting pipe.

[0012] Further, the rain absorber further includes a plurality of water inlet pipes vertically connected to the second side surface of the rain absorption ring, a joint body connected to the water inlet end of each water inlet pipe, and a connecting screw rod vertically connected to each water inlet pipe; the joint body is used to be connected to a rainwater supply device through a connecting hose connected thereto; the connecting screw rod is used to be detachably connected to a mounting bracket.

[0013] Further, the mounting bracket includes a group of bracket rods respectively corresponding to a plurality of water inlet pipes, and a plurality of adjusting rod groups used to connect and lock the group of bracket rods; the length of the group of bracket rods is adjustable along its length direction, and the upper end of the group of bracket rods is detachably connected to the correspondingly arranged connecting screw rod; the plurality of adjusting rod groups are sequentially arranged along the length direction of the group of bracket rods, and each adjusting rod group sequentially connects the group of bracket rods.

[0014] Further, the group of bracket rods includes an upper support rod and a lower support rod which are hollowly arranged, a fixing nut fixed to the top end of the upper support rod, a locking nut sleeved on the outer circle of the connecting screw rod, and a support foot; the upper support rod and the lower support rod are sequentially arranged along the axial direction and are detachably connected through a threaded connection structure therebetween; the support foot is connected to the outer periphery of the bottom end of the lower support rod so that the group of bracket rods stably supports on the test ground; internal threads are provided inside the upper end of the upper support rod, and the correspondingly arranged connecting screw rod is inserted downward into the upper support rod and is threadedly connected to its internal threads, and is fastened through the cooperation of the fixing nut and the locking nut.

[0015] Further, through holes vertically penetrating the rod bodies are also formed in the upper support rod and the lower support rod; the adjusting rod group includes an adjusting rod and a fastening nut threadedly connected to the outer circumference of the adjusting rod; the adjusting rod sequentially passes through the through holes at the same height position on multiple upper support rods or lower support rods and then extends out; the fastening nut is located at the extended end of the adjusting rod for fastening multiple groups of support rod groups together as a whole.

[0016] According to another aspect of the present invention, an engine rain ingestion test system is further provided, including: an engine to be tested connected to a test bench, a rain ingestion device as described in any one of the above disposed at the front end of the engine air intake, a control system and a power absorption and measurement system connected to the engine, a test system respectively connected to the engine and the equipment on the test bench, and a monitoring system connected to the control system.

[0017] The present invention has the following beneficial effects:

[0018] Aiming at the requirements for rotorcraft engine rain ingestion verification in Article 33.78(b) of the "Airworthiness Regulations for Aeroengines" (CCAR-33-R2) and combining the characteristics of civil aviation turboshaft engines, the present invention innovatively designs a suitable rain ingestion device to simulate that the engine suddenly encounters rain that meets the certification requirements, that is, rain evenly distributed on the intake plane, so as to meet the requirements of ground test verification; the rain ingestion device of the present invention, by adopting multiple nozzles with the functions of swirl and uniform rain droplets, and matching with the rain collector and the rainwater supply equipment, and a special setting method of multiple nozzles, that is, evenly spaced along the median line of the engine intake section, realizes the uniform distribution of rainwater on the engine intake section, solves the problems existing in the prior art, and the rain ingestion device of the present invention has strong versatility and convenient operation. By replacing different rain collectors and nozzles, it can meet the rain ingestion airworthiness verification requirements of different models of engines including turboshaft engines with a front power output structure; the present invention has been applied to the whole-machine rain ingestion airworthiness scientific research test of a certain civil turboshaft engine with a front power output structure, and the inhaled rain is evenly distributed on the intake plane, and the test results meet the requirements.

[0019] In addition to the purposes, features and advantages described above, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0021] Figure 1 is a schematic spatial structure diagram of the rain ingestion device for aeroengine test in a preferred embodiment of the present invention;

[0022] Figure 2 is Figure 1 Partial sectional structure schematic diagram of the rain absorber in the middle;

[0023] Figure 3 is Figure 1 Exploded schematic diagram of the rain absorption ring in the middle;

[0024] Figure 4 is Figure 1 Right view structure schematic diagram of the rain absorber in the middle;

[0025] Figure 5 is Figure 1 Front view structure schematic diagram of the support rod group in the middle;

[0026] Figure 6 is Figure 1 Spatial structure schematic diagram of the nozzle in the middle;

[0027] Figure 7 is Figure 6 Sectional front view structure schematic diagram of;

[0028] Figure 8 Schematic diagram of the rain absorption test system structure of the preferred embodiment of the present invention for an engine.

[0029] Legend description

[0030] 10. Installation bracket; 11. Support rod group; 111. Upper support rod; 112. Lower support rod; 113. Fixed nut; 114. Threaded connection structure; 115. Foot support; 12. Adjusting rod group; 121. Adjusting rod; 122. Tightening nut; 20. Rain absorber; 21. Rain absorption ring; 211. Left half rain absorption ring; 212. Right half rain absorption ring; 22. Nozzle installation pipe; 23. Water inlet pipe; 24. Connector body; 25. Connecting screw; 30. Nozzle; 31. Nozzle head; 32. Nozzle connecting pipe; 33. Sealing piece; 34. Cyclone. Detailed implementation manners

[0031] The following will describe in detail the embodiments of the present invention with reference to the accompanying drawings, but the present invention can be implemented in many different ways defined and covered by the following.

[0032] Referring to Figure 1 , the preferred embodiment of the present invention provides a rain absorption device for an aero-engine test, including: an installation bracket 10 vertically erected, a rain absorber 20 disposed on the installation bracket 10, and a plurality of nozzles 30 for jetting liquid water outward in a swirling manner. The rain absorber 20 is also connected to a rainwater supply device to supply liquid water that meets the requirements of flow rate, water quality, and pressure to the rain absorber 20. The nozzles 30 are connected to the rain absorber 20 and are evenly spaced along the median line of the engine intake section, so that the liquid water is evenly sprayed into the intake section.

[0033] In response to the requirements for rain ingestion verification of rotorcraft engines in Article 33.78(b) of the "Airworthiness Regulations for Aero-engines" (CCAR-33-R2), and in combination with the characteristics of civil aviation turboshaft engines, the present invention innovatively designs an applicable rain ingestion device, which is used to simulate the rain that the engine suddenly encounters and meets the certification requirements, that is, the rain evenly distributed on the intake plane, so as to meet the requirements of ground test verification; the rain ingestion device of the present invention realizes the even distribution of rain on the engine intake section by adopting a plurality of nozzles 30 with swirling and uniform raindrop effects, and matching with the rain ingestion device and the rain supply equipment, and a special setting method of the plurality of nozzles 30, that is, evenly spaced along the median line of the engine intake section, so as to solve the problems existing in the prior art. Moreover, the rain ingestion device of the present invention has strong versatility and convenient operation. By replacing different rain ingestion devices 20 and nozzles 30, it can meet the rain ingestion airworthiness verification requirements of different types of engines, including turboshaft engines with a front power output structure; the present invention has been applied to the rain ingestion airworthiness scientific research test of a certain civil turboshaft engine with a front power output structure, and the inhaled rain is evenly distributed on the intake plane, and the test results meet the requirements.

[0034] Optionally, as Figure 1 and Figure 2 shown, the rain ingestion device 20 includes a hollow annular rain ingestion ring 21 and a plurality of nozzle mounting pipes 22 corresponding to the plurality of nozzles 30 one by one. The median diameter of the inner ring cavity of the rain ingestion ring 21 is equal to the median diameter of the intake section ring surface. The plurality of nozzle mounting pipes 22 are located on the first side of the rain ingestion ring 21 and are evenly spaced along the median line of the inner ring cavity of the rain ingestion ring 21, and each nozzle mounting pipe 22 is vertically connected to the rain ingestion ring 21. The nozzle 30 is detachably connected to the corresponding nozzle mounting pipe 22. In this optional solution, for a turboshaft engine with a front power output structure, the median diameter of the inner ring cavity of the rain ingestion ring 21 is made consistent with the median diameter of the engine intake section ring surface, and the nozzle mounting pipe 22 is located on the median diameter of the rain ingestion ring 21, so as to ensure that the nozzle 30 is located on the median diameter of the engine intake section ring surface; for non-annular intake engines, the nozzle 30 can be directly arranged on the median diameter of the entire intake section.

[0035] In actual design, since the intake section of the front power output turboshaft engine is a ring surface, in the present invention, the rain ingestion device adopts a hollow annular rain ingestion ring 21 and is combined with the structural setting of a plurality of nozzle mounting pipes 22 to make the inhaled rain evenly distributed on the intake plane; when the intake section of the engine is non-annular, it is only necessary to ensure that the nozzles 30 are evenly spaced along the median line of the engine intake section, so that the inhaled rain can be evenly distributed on the intake plane. Therefore, the device of the present invention has strong adaptability.

[0036] In this optional solution, as Figure 3As shown in the figure, the rain suction ring 21 includes a left half rain suction ring 211 and a right half rain suction ring 212 arranged in an arc-shaped tube. The first ends and the second ends of both the left half rain suction ring 211 and the right half rain suction ring 212 are detachably connected into a ring through a guiding connection structure therebetween. The rain suction ring 21 of the rain suction device of the present invention adopts a replaceable half-ring structure, which has strong versatility and is suitable for matching the inlet sizes of engines of different models. At the same time, for a turboshaft engine with a front power output structure, by disassembling the rain suction ring 21 into the left half rain suction ring 211 and the right half rain suction ring 212, it is possible to achieve quick installation and removal without removing the connecting shaft, and the operation is simple and efficient. In the specific implementation manner of this optional solution, an inner guiding groove is machined along the circumferential direction at the first end of the left half rain suction ring 211. At the same time, a connecting outer convex guiding head extending along the circumferential direction is provided at the first end of the right half rain suction ring 212. Thus, after the right half rain suction ring 212 is inserted into the inner guiding groove of the left half rain suction ring 211 through the connecting outer convex guiding head, it is connected to the left half rain suction ring 211, thereby realizing the quick installation and disassembly of the two; similarly, the second end of the left half rain suction ring 211 and the second end of the right half rain suction ring 212 also adopt this connection method.

[0037] In this optional solution, as Figure 2 shown, the nozzle installation pipe 22 is a hollow pipe. Its first end is perpendicular to the rain suction ring 21 and is fixedly welded to the rain suction ring 21, and its opposite second end is machined with an internal thread. The correspondingly arranged nozzle 30 is threadedly connected to the second end of the nozzle installation pipe 22, so that the nozzle 30 can be quickly installed and disassembled. The device of the present invention has simple operation and is adjustable. By replacing the rain suction ring 21 and the nozzle 30, it is possible to match the inlet sizes of different models of aeroengines, and the applicability is strong; the device of the present invention also has the functions of swirling and evenly distributing raindrops, and can meet the rain suction test requirements of different models of engines including turboshaft engines with a front power output structure.

[0038] Furthermore, in combination with Figure 6 and Figure 7As shown, the nozzle 30 includes a nozzle head 31, a nozzle connecting pipe 32 coaxially communicating with the nozzle head 31, a sealing piece 33 sleeved on the outer circumference of the nozzle connecting pipe 32, and a swirler 34 arranged in the nozzle head 31. An external thread is machined on the outer circumference of the nozzle connecting pipe 32, and the nozzle 30 is detachably fixed to the nozzle mounting pipe 22 through the connection of its external thread with the internal thread of the nozzle mounting pipe 22. The sealing piece 33 is pressed between the end of the nozzle head 31 and the end face of the nozzle mounting pipe 22. In the nozzle 30 of the present invention, a swirler 34 is provided inside, which has the functions of swirling and making the raindrops uniform, and is matched with the rain absorption ring 21 and the rainwater supply device; the greater the water supply pressure, the greater the flow rate, and the greater the spray cone angle of the nozzle 30. On the premise of meeting the rain absorption flow rate, the nozzle size, the structure of the swirler, and the number of nozzles need to ensure that the raindrops are evenly distributed circumferentially and radially on the plane of the engine intake duct; if a single rain absorption ring 21 cannot meet the requirements, a multi-ring coaxial nested structure can be adopted, that is, multiple rain absorption rings 21 with different outer diameters are nested in sequence; the rain absorption nozzle 30 is easy to replace and can be replaced according to different requirements to adapt to the matching of the uniformity of different models of engines.

[0039] Optionally, as Figure 4 shown, the rain absorber 20 further includes a plurality of water inlet pipes 23 vertically connected to the second side surface of the rain absorption ring 21, a joint body 24 connected to the water inlet ends of the water inlet pipes 23, and a connecting screw 25 vertically connecting the water inlet pipes 23. The joint body 24 is used to be connected to the rainwater supply device through a connecting hose connected thereto. The connecting screw 25 is used to be detachably connected to the mounting bracket 10. In the present invention, the structure of the rain absorber 20 is simply arranged, easy to machine and prepare, and has a low preparation cost.

[0040] Optionally, as Figure 1 shown, the mounting bracket 10 includes a group of support rods 11 corresponding to the plurality of water inlet pipes 23 one by one, and a group of adjusting rods 12 for connecting and locking the group of support rods 11. The length of the group of support rods 11 is adjustable along its length direction, and the upper end of the group of support rods 11 is detachably connected to the corresponding connecting screw 25. The group of adjusting rods 12 are arranged in sequence along the length direction of the group of support rods 11, and each group of adjusting rods 12 connects the group of support rods 11 in sequence.

[0041] In this alternative solution, as Figure 1 and Figure 5As shown in the figure, the support rod group 11 includes an upper support rod 111 and a lower support rod 112 that are hollow, a fixing nut 113 fixed to the top end of the upper support rod 111, a locking nut sleeved on the outer circumference of the connecting screw rod 25, and a foot support 115. The upper support rod 111 and the lower support rod 112 are arranged in sequence along the axial direction, and are detachably connected through a threaded connection structure 114 provided therebetween; in the specific implementation manner of this alternative solution, the threaded connection structure 114 includes a threaded inner rod connected to the top end of the lower support rod 112, a locking nut sleeved on the outer circumference of the threaded inner rod, a fixing nut fixed to the bottom end of the upper support rod 111, and an internal thread provided inside the lower end of the upper support rod 111; after the threaded inner rod is inserted upward into the upper support rod 111, it is threadedly connected with the internal thread of the upper support rod 111, and is fastened in cooperation with the fixing nut and the locking nut, so as to realize the detachable connection between the lower support rod 112 and the upper support rod 111, and by rotating the lower support rod 112, the length of the support rod group 11 along the axial direction can be adjusted, that is, the height of the mounting bracket 10, to match the inlet heights of different models of aero-engines, and the operation is simple and the adjustment range is large. The foot support 115 is connected to the outer circumference of the bottom end of the lower support rod 112, so that the support rod group 11 is stably supported on the test ground. An internal thread is provided inside the upper end of the upper support rod 111, and the correspondingly arranged connecting screw rod 25 is inserted downward into the upper support rod 111 and is threadedly connected with its internal thread, and is fastened in cooperation with the fixing nut 113 and the locking nut. By rotating the upper support rod 111, the height of the support rod group 11 can also be adjusted.

[0042] In this alternative solution, as Figure 1 shown, through holes vertically penetrating the rod bodies are also provided on the upper support rod 111 and the lower support rod 112. The adjusting rod group 12 includes an adjusting rod 121 and a fastening nut 122 threadedly connected to the outer circumference of the adjusting rod 121. The adjusting rod 121 sequentially passes through the through holes at the same position and height on multiple upper support rods 111 or lower support rods 112 and then extends out. The fastening nut 122 is located at the outer extending end of the adjusting rod 121 to be used for connecting and fastening multiple groups of support rod groups 11 into one body. During actual operation, after the height of the support rod group 11 is adjusted, the adjusting rod 121 is installed at the corresponding positions of two groups of support rod groups 11 and is locked by the fastening nut 122. This structure has simple operation and a large adjustment range, and can be suitable for the height matching of different models of engines.

[0043] Referring to Figure 8 , a preferred embodiment of the present invention further provides an engine rain suction test system, including: an engine to be tested connected to a test bench, a rain suction device as described in any one of the above provided at the front end of the engine air inlet, and a control system, a power absorption and measurement system connected to the engine, a test system respectively connected to the engine and the equipment on the test bench, and a monitoring system connected to the control system.

[0044] During the test, a rain absorption device is used to introduce liquid water accounting for a specified proportion of the engine intake air volume into the engine inlet to simulate the engine suddenly encountering rain that meets the airworthiness certification requirements. All the liquid water enters the engine and is evenly distributed at the intake section. The schematic diagram of the test is shown in Figure 8 : Before the test, the rain absorption device is installed at the front end of the engine intake port. During the test process, liquid water that meets the requirements of flow rate, water quality, and pressure matching the rain absorption device is supplied by the rainwater supply equipment. After swirling and being made uniform by the nozzles of the rain absorption device, the rainwater is evenly distributed at the engine intake section; the monitoring system is used to monitor the rain absorption situation of the engine; the power absorption and measurement system is used to absorb and measure the output shaft power of the engine; the test system is used to monitor and record all parameters of the engine and the test bench equipment throughout the process; the control system is used to change the working state of the engine. The engine rain absorption test system of the present invention can meet the requirements of ground test verification, and this system has strong applicability, convenient operation, and can be used for the rain absorption verification needs of different models of civil aviation engines.

[0045] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A rain suction device for aero-engine tests, characterized in that, Comprising: An installation bracket (10) vertically installed, a rain absorber (20) arranged on the installation bracket (10), and a plurality of nozzles (30) for ejecting liquid water outward in a swirling manner; The rain absorber (20) is further connected with a rainwater supply device to supply liquid water meeting the requirements of flow rate, water quality and pressure to the rain absorber (20); The nozzles (30) are connected to the rain absorber (20) and are evenly spaced along the median line of the engine intake cross-section, so that the liquid water is evenly sprayed into the intake cross-section.

2. The rain absorption device for aero-engine test according to claim 1, characterized in that The rain absorber (20) includes a hollow ring-shaped rain absorption ring (21) and a plurality of nozzle mounting pipes (22) provided corresponding to the plurality of nozzles (30); The median diameter of the inner ring cavity of the rain absorption ring (21) is equal to the median diameter of the ring surface of the intake cross-section; The plurality of nozzle mounting pipes (22) are located on the first side of the rain absorption ring (21) and are evenly spaced along the median line of the inner ring cavity of the rain absorption ring (21), and each nozzle mounting pipe (22) is vertically communicated with the rain absorption ring (21); The nozzles (30) are detachably connected to the corresponding nozzle mounting pipes (22).

3. The rain absorption device for aero-engine test according to claim 2, characterized in that The rain absorption ring (21) includes a rain absorption left half ring (211) and a rain absorption right half ring (212) arranged as arc-shaped pipes; The first ends and the second ends of the rain absorption left half ring (211) and the rain absorption right half ring (212) are respectively detachably connected into a ring through a guiding connection structure therebetween.

4. The rain absorption device for aero-engine test according to claim 2, characterized in that The nozzle mounting pipe (22) is a hollow pipe, its first end is perpendicular to the rain absorption ring (21) and is fixedly welded to the rain absorption ring (21), and its opposite second end is processed with internal threads; The correspondingly arranged nozzles (30) are threadedly connected to the second end of the nozzle mounting pipe (22).

5. The rain absorption device for aero-engine test according to claim 4, characterized in that The nozzle (30) includes a nozzle head (31), a nozzle connecting pipe (32) coaxially communicated with the nozzle head (31), a sealing piece (33) sleeved on the outer circumference of the nozzle connecting pipe (32), and a swirler (34) arranged in the nozzle head (31); External threads are processed on the outer circumference of the nozzle connecting pipe (32), and the nozzle (30) is detachably fixed to the nozzle mounting pipe (22) through the connection of its external threads and the internal threads of the nozzle mounting pipe (22); The sealing piece (33) is pressed between the end of the nozzle head (31) and the end face of the nozzle mounting pipe (22).

6. The rain absorption device for aero-engine test according to claim 1, characterized in that The rain absorber (20) further includes a plurality of water inlet pipes (23) vertically connected to the second side surface of the rain absorption ring (21), a joint body (24) connected to the water inlet end of each water inlet pipe (23), and a connecting screw (25) vertically connecting each water inlet pipe (23); The joint body (24) is used to be connected with the rainwater supply device through a connecting hose connected thereto; The connecting screw (25) is used to be detachably connected to the installation bracket (10).

7. The rain suction device for aero-engine test according to claim 6, characterized in that the mounting bracket (10) includes a bracket rod group (11) provided corresponding to each of the plurality of water inlet pipes (23), and a plurality of adjusting rod groups (12) for connecting and locking the plurality of bracket rod groups (11); the length of the bracket rod group (11) is adjustable along its length direction, and the upper end of the bracket rod group (11) is detachably connected to the corresponding connecting screw (25); the plurality of adjusting rod groups (12) are arranged in sequence along the length direction of the bracket rod group (11), and each adjusting rod group (12) is sequentially connected to the plurality of bracket rod groups (11).

8. The rain suction device for aero-engine test according to claim 7, characterized in that the bracket rod group (11) includes an upper support rod (111) and a lower support rod (112) which are hollow, a fixing nut (113) fixed to the top end of the upper support rod (111), a locking nut sleeved on the outer circle of the connecting screw (25), and a support leg (115); the upper support rod (111) and the lower support rod (112) are arranged axially in sequence, and are detachably connected through a threaded connection structure (114) provided therebetween; the support leg (115) is connected to the outer periphery of the bottom end of the lower support rod (112) so that the bracket rod group (11) is stably supported on the test ground; the upper end of the upper support rod (111) is internally provided with an internal thread, the corresponding connecting screw (25) is inserted downward into the upper support rod (111) and is threadedly connected to its internal thread, and is fastened by the cooperation of the fixing nut (113) and the locking nut.

9. The rain suction device for aero-engine test according to claim 8, characterized in that through holes vertically penetrating the rod bodies are further formed in the upper support rod (111) and the lower support rod (112); the adjusting rod group (12) includes an adjusting rod (121) and a fastening nut (122) threadedly connected to the outer circle of the adjusting rod (121); the adjusting rod (121) sequentially passes through the through holes at the same position and height on the plurality of upper support rods (111) or lower support rods (112) and then extends out; the fastening nut (122) is located at the outer extending end of the adjusting rod (121) for connecting and fastening the plurality of bracket rod groups (11) into one body.

10. An engine rain suction test system, characterized in that, It includes: a rain suction device as described in any one of claims 1-9 connected to the engine to be tested on the test bench and arranged at the front end of the engine air inlet, an operating system and a power absorption and measurement system connected to the engine, a test system connected to the engine and the equipment on the test bench respectively, and a monitoring system connected to the operating system.

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