Gas flow guiding device for horizontal engine test bed

Abstract

This invention relates to engine testing equipment, specifically to a gas flow guiding device for a horizontal engine test stand. To address the shortcomings of existing engine test stand gas flow guiding devices that cannot simultaneously meet the requirements of ground testing and high-performance testing, the gas flow guiding device for a horizontal engine test stand of this invention includes a gas flow guiding cylinder, a cooling unit, and a mounting bracket disposed below the gas flow guiding cylinder. The gas flow guiding cylinder includes a horizontal section and an inclined section connected in sequence, and the horizontal and inclined sections are detachably connected. The cooling unit delivers cooling water to multiple spray pipes disposed on the inner wall of the gas flow guiding cylinder, forming a protective water film through the spray pipes, and supplies water to a cooling water tank at the bottom of the inclined section, where water is sprayed onto the upper surface of the cooling water tank to cool the gas.

Description

Technical Field

[0001] This invention relates to engine testing equipment, specifically to a gas flow guiding device for a horizontal engine testing stand. Background Technology

[0002] Horizontal engine test stands are core ground facilities for conducting ground performance evaluation and reliability verification of liquid rocket engines. One of their core functions is to safely and effectively handle the high-temperature, high-speed exhaust streams of thousands of degrees Celsius ejected during engine ignition tests. Improper handling of these exhaust streams can cause severe ablation, erosion, and vibration damage to the test stand's floor, foundation structure, and surrounding equipment, directly threatening test safety and the facility's lifespan. Therefore, a highly efficient and reliable exhaust flow and cooling unit is an indispensable and critical component of any modern horizontal test stand.

[0003] With the rapid development of aerospace propulsion technology, the research and iteration of new engine models place higher demands on the comprehensive testing capabilities of test stands. Traditional fixed flow guidance devices have significant limitations: First, their structure and function are fixed, making it difficult to simultaneously optimize and balance the requirements of strong gas flow guidance and noise reduction for ground testing, as well as the aerodynamic environment construction required for high-mode testing, resulting in contradictions in flow field organization. Second, building two independent flow guidance systems for the two testing modes would lead to a significant increase in construction costs, huge land resource consumption, and a long switching cycle, failing to meet the needs of efficient and flexible scientific research testing. Therefore, developing a flow guidance system that can meet the current high-intensity ground testing requirements while smoothly transitioning to future high-mode testing has become an urgent and highly valuable engineering project. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing engine test bench gas diversion devices, which cannot simultaneously meet the requirements of ground testing and high-model testing, and to provide a horizontal engine test bench gas diversion device.

[0005] To achieve the above objectives, the technical solution provided by this invention is as follows:

[0006] A gas flow guiding device for a horizontal engine test stand is characterized by comprising a gas flow guiding cylinder, a cooling unit, and a mounting bracket disposed below the gas flow guiding cylinder. The gas flow guiding cylinder includes a horizontal section and an inclined section connected sequentially, which are detachably connected. A drain outlet is provided at the bottom of the horizontal section, and the inlet of the horizontal section corresponds to the engine outlet. The inclined section is inclined upwards to guide the gas flow. The cooling unit includes multiple spray pipes disposed along the inner walls of the horizontal and inclined sections, and multiple cooling water tanks disposed at the bottom of the inclined section. The spray pipes and cooling water tanks are connected to a cooling water source. Multiple water spray holes, communicating with the interior of the inclined section, are evenly distributed on the upper surface of the multiple cooling water tanks and are inclined towards the outlet of the inclined section. The mounting bracket is located below the horizontal and inclined sections for fixing and supporting them.

[0007] Furthermore, the spray pipes are arranged axially along the horizontal and inclined sections, and a plurality of the spray pipes are evenly distributed circumferentially along the horizontal and inclined sections, respectively.

[0008] Multiple water spray points are spaced apart along the axial direction on the spray pipe. Each water spray point includes at least three spray holes arranged around the circumference of the spray pipe. The spray hole located in the middle position is arranged towards the central axis of the horizontal or inclined section, and the two outermost spray holes are arranged towards the side wall of the adjacent horizontal or inclined section, respectively, for spraying water onto the inner side wall to form a water film for protection.

[0009] Furthermore, the cooling unit also includes a spray ring arranged circumferentially around the inlet of the horizontal section, and the spray ring is evenly provided with a plurality of spray holes facing the inlet of the horizontal section.

[0010] Furthermore, in each spray point on the spray pipe, the diameter of the spray hole located in the middle position is larger than the diameter of the spray holes on both sides.

[0011] Furthermore, the number of spray pipes in the horizontal section and the inclined section are 4 each, and they are respectively set on the upper and lower sides of the horizontal section and the inclined section.

[0012] The distance between adjacent spray points on the horizontal section of the spray pipe is 100mm.

[0013] The interval between adjacent spray points on the inclined section of the spray pipe is 80mm.

[0014] Furthermore, the upper surface of the cooling water tank near the outlet of the inclined section is defined as the core area, and the upper surface of the cooling water tank away from the outlet is defined as the diffusion area. The core area is the area directly impacted by the combustion gas. The number and diameter of the water spray holes on the upper surface of the cooling water tank in the core area are greater than the number and diameter of the water spray holes in the diffusion area.

[0015] Furthermore, the water spray volume of the water spray nozzles of the cooling water tank located far from the outlet of the inclined section is less than that of the other cooling water tanks;

[0016] The cooling water tank is equipped with drain pipes at its lowest point to drain the cooling water.

[0017] Furthermore, there are four cooling water tanks, which are arranged sequentially along the central axis at the bottom of the inclined section near the outlet, corresponding to the gas impact area;

[0018] The total length of the four cooling water tanks along the central axis is 4 / 5 of the inclined section.

[0019] Furthermore, the bottom of the horizontal section is sloped, with the lowest point near the middle section. The drain outlet is located at the lowest point, and multiple guide plates are installed on the drain outlet.

[0020] Furthermore, the outer wall of the gas guide tube is provided with a reinforcing rib plate made of Q235B material, and the surface of the reinforcing rib plate is correspondingly provided with square steel made of Q235B material.

[0021] The gas flow guide tube has a rectangular cross-section and is formed by welding Q235B steel plates;

[0022] The upper surface of the cooling water tank is made of Q245R, and the rest is made of Q235B.

[0023] The beneficial effects of this invention are:

[0024] 1. This invention is used to guide high-temperature combustion gases along the thrust axis and discharge them at an upward angle, effectively avoiding direct impact and ablation of the combustion gases on the test stand foundation. Furthermore, the horizontal and inclined sections of this invention adopt a detachable modular design, allowing for convenient removal of some components during high-mode testing. This provides a clear interface and physical space for installing an "air-venting diffuser," enabling a single test stand platform to perform two different types of testing tasks. This significantly improves facility utilization and strategic value, avoids redundant construction, achieves optimal cost-effectiveness throughout its lifecycle, and realizes the platform's multifunctionality and long-term economic benefits.

[0025] 2. The invention incorporates a high-strength cooling unit to ensure the structural integrity and long-term operational reliability of the gas guide tube under extreme heat loads, providing reliable protection and guaranteeing test safety and facility integrity. This is a fundamental prerequisite for the safe conduct of test missions.

[0026] 3. The water spray points provided on the spray pipe of the present invention include at least three spray holes arranged along the circumference of the spray pipe, with the two outermost spray holes respectively facing the adjacent side wall, thereby forming a water film protection on the inner side wall.

[0027] 4. The present invention provides water spray holes on the cooling water tank for water spraying and cooling. At the same time, the water flow in the cooling water tank forms a cooling jacket, which effectively ensures the cooling effect of the core area of ​​the inclined section. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the present invention (the serrated structure of the inclined section outlet is not shown).

[0029] Figure 2 This is a schematic diagram of the overall layout of an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the internal structure of the cooling water tank in an embodiment of the present invention;

[0031] Figure 4 This is a three-dimensional structural diagram of the mounting bracket in an embodiment of the present invention;

[0032] Figure 5 This is a top view of the mounting bracket in an embodiment of the present invention;

[0033] Figure 6 This is a connection diagram of the cooling unit in an embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of the spray point location in an embodiment of the present invention;

[0035] Figure 8 This is a schematic diagram of the structure of the guide plate in an embodiment of the present invention;

[0036] Figure 9 This is a schematic diagram of the heat load on the upper surface of the cooling water tank in an embodiment of the present invention.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1-Gas flow guide tube, 11-Flow guide plate, 12-Horizontal section, 13-Inclined section, 14-Spray pipe, 15-Cooling water tank, 2-Reinforcing rib plate, 3-Mounting bracket, 31-First base plate, 32-Second base plate, 33-Support rod, 34-Reinforcing rib, 4-Electromagnetic flow meter, 41-Orifice plate. Detailed Implementation

[0039] The gas guiding device for the horizontal engine test stand of this invention is mainly used for guiding the high-temperature gas generated during engine testing. It is arranged along the thrust axis on the test stand and has the functions of guiding and cooling the gas, ultimately causing the gas to be sprayed upwards at an angle. The gas guiding device for the horizontal engine test stand includes a gas guiding cylinder 1, a cooling unit, and a mounting bracket 3. The cooling unit is used to cool the gas guiding cylinder 1 through spray heat exchange.

[0040] The gas diversion cylinder 1 is constructed from welded steel plates with a thickness of 25mm. The cross-section of the gas diversion cylinder 1 is a 4×4m square. Reinforcing ribs and reinforcing square tubes are arranged on the outer side of the cylinder body. The structure is as follows: Figure 1 As shown, the gas flow guide tube 1 includes a horizontal section 12 and an inclined section 13 connected in sequence. The two sections are detachably connected. The inclined section 13 is inclined upwards, forming an angle of 15° with the horizontal section 12. The two sections are connected by a flange. The inclination angle of the inclined section 13 can be determined based on the flow field simulation analysis results. The mounting bracket 3 is set below the gas flow guide tube 1 to support it. Figure 2 This is a general layout diagram of the gas flow guiding device for the horizontal engine test stand of the present invention. The inlet of the horizontal section 12 is 1.5m away from the engine outlet plane, and the central axis of the gas flow guiding device is 2.4m away from the ground.

[0041] The horizontal section 12 of the gas diversion cylinder 1 has a total length of 10m. The cylinder body is made of Q235B steel. A 400mm wide, 25mm thick reinforcing rib plate 2 and a reinforcing square tube (200mm×10mm) are arranged on the outer side of the cylinder body. The reinforcing rib plate 2 and the square tube are also made of Q235B steel. The bottom of the horizontal section 12 is sloped so that the lowest point is near the middle section, and a drain outlet is correspondingly provided. To prevent gas leakage, multiple guide plates 11 are installed on the drain outlet, which serve to guide cooling water. Figure 8 As shown. A water trough is provided on the external mounting base corresponding to the guide plate 11 to collect the cooling water discharged from the gas guide cylinder 1. The water trough is 400mm lower than the inlet of the horizontal section 12. One end of the water trough (4×1.5×1m) is connected to the collection tank through a water channel (1.5×1m). At a water flow rate of 2t / s, the flow velocity in the water channel is about 1.3m / s, which can smoothly discharge the water.

[0042] The inclined section 13 is 10m long and made of Q245R steel, with reinforcing ribs 2 and square tubing on the outside. The bottom of the inclined section 13 is subjected to combustion gas impact, with the highest temperature at the impact point reaching 1290K. Therefore, the bottom of the inclined section 13, from the end near the horizontal section 12 to the outlet, consists of a 4m*2m steel plate with a thickness of 25mm and four "box-shaped" cooling water tanks 15. Each cooling water tank 15 measures 4m*2m*0.3m and is constructed from 25mm thick steel plates welded together (the upper surface of the cooling water tank 15 is made of Q245R, and the rest is made of Q235B). The structure of the cooling water tank 15 is as follows... Figure 3As shown, the cooling water tank 15 is reinforced internally with 25mm thick reinforcing ribs. A 100mm diameter connecting hole is opened on the reinforcing rib 2 to ensure the flow of cooling water inside the tank. The internal space of the cooling water tank 15 is interconnected, forming a cooling interlayer. Water spray holes, communicating with the inclined section 13, are evenly distributed on the upper surface of the cooling water tank 15. The spray holes are inclined towards the outlet of the inclined section 13. The appropriate hole diameter and number are selected according to the cooling water volume and flow rate. In this embodiment, a total of 7000 spray holes are provided, including 1000 holes with a diameter of Φ2.5mm and 6000 holes with a diameter of Φ3.5mm. The water spray holes on the upper surface of the cooling water tank 15 spray water to cool the gas, while ensuring that the bottom of the inclined section 13 is not ablated. The cooling water generated by the inclined section 13 flows through the guide plate 11 at the drain outlet to the external water tank, and then through the water channel along the side of the gas guide cylinder 1 to the collection tank. The two side walls of the inclined section 13 at the exit are designed with a sawtooth structure, which has the effect of reducing noise.

[0043] Reinforcing ribs 2 and square tubes are installed on the outer sides of the horizontal section 12 and inclined section 13 of the gas diversion cylinder 1 to improve structural strength, such as Figure 1 As shown, all square steel is 200mm square steel, and the thickness of the reinforcing ribs 2 is 25mm. Details are as follows:

[0044] ① On the top and outer walls of the horizontal section 12 of the gas diversion tube 1, axial reinforcing ribs 2 of 7600*400*25mm are laid in sections. Perpendicular to the direction of the corresponding axial reinforcing ribs 2, multiple transverse reinforcing ribs 2 of 400*40*25mm are laid. The axial reinforcing ribs 2 are laid in sections between the transverse reinforcing ribs 2. In this embodiment, the interval between adjacent transverse reinforcing ribs 2 is 1800mm, and a total of 6 transverse reinforcing ribs 2 are laid. The transverse reinforcing ribs 2 on the top and outer walls of the sides are respectively set.

[0045] ② The outer wall of the horizontal section 12 of the gas flow guide tube 1 is located above the axial stiffening plate 2 and the transverse stiffening plate 2. Square steel is laid along its length. The length of the square steel corresponding to the axial stiffening plate 2 is 7600mm, and the length of the square steel corresponding to the transverse stiffening plate 2 is 400mm.

[0046] ③ Axial reinforcing ribs 2 are laid in sections on the top and outer side walls of the inclined section 13 of the gas diversion tube 1, corresponding to the axial reinforcing ribs 2 of the horizontal section 12. Transverse reinforcing ribs 2 with specifications of 400*40*25mm are laid at intervals of 1800mm on the outer side wall of the inclined section 13, perpendicular to the corresponding axial reinforcing ribs 2. The axial reinforcing ribs 2 are laid in sections between the transverse reinforcing ribs 2. In this embodiment, a total of 4 reinforcing ribs 2 are laid. The specifications of the axial reinforcing ribs 2 are set according to the length of the corresponding position on the side wall of the inclined section 13, with the top set at 4400*400*25mm and the sides at 6400*400*25mm.

[0047] ④ Above the inclined section 13 of the gas guide tube 1, axial reinforcing ribs 2 and transverse reinforcing ribs 2, 200 square steel bars are also provided along their length direction, with the length of the square steel bars corresponding to the reinforcing ribs 2.

[0048] Specifically, the bottom of the gas diversion cylinder 1 is horizontally equipped with 11 square steel bars, each with a length of 4450mm. Among them, 6 bars are set in the inclined section 13 and 5 bars are set in the horizontal section 12. In the inclined section 13, the reinforcing ribs 2 of the 4 square steel bars in the middle are spaced 1800mm apart, the reinforcing ribs of the 2 square steel bars near the outlet are spaced 1124mm apart, and the reinforcing ribs of the 2 square steel bars far from the outlet are spaced 1862mm apart. The square steel bars in the horizontal section 12 are spaced 1800mm apart, and there are no square steel bars at the drain outlet.

[0049] ⑤ The outlet of the inclined section 13 of the gas guide tube 1 faces upward, and the plane where the outlet is located forms a certain angle with the central axis. An additional reinforcing rib plate 2 is provided on the outer periphery of the outlet, and square steel is correspondingly provided on the reinforcing rib plate 2. The length of the square steel on both sides of the outlet is 3700mm.

[0050] Mounting bracket 3 Figure 4 and Figure 5 As shown, the details are as follows:

[0051] ⑥ Includes a first base plate 31 and a second base plate 32 arranged in parallel, multiple support rods 33 correspondingly arranged on the first base plate 31 and the second base plate 32, and a bottom reinforcing rib plate 2 and a bottom square steel located between the corresponding support rods 33. The bottom reinforcing rib plate 2 is arranged on the upper end of the support rod 33, and its upper surface is fixedly connected to the bottom of the gas guide tube 1 at the corresponding position. At the same time, it reinforces the bottom outer wall of the gas guide tube 1. The bottom square steel is arranged on the lower surface of the bottom reinforcing rib plate 2. The bottom reinforcing rib plate 2 is respectively arranged corresponding to the transverse reinforcing rib plates 2 on the outer walls on both sides of the gas guide tube 1. The support rod 33 is arranged corresponding to each bottom reinforcing rib plate 2, and its upper end is fixedly connected to the end of the bottom reinforcing rib plate 2 at the corresponding position. The part of the mounting bracket 3 corresponding to the horizontal section 12 is defined as the first box bottom support, and the part corresponding to the inclined section 13 is defined as the second box bottom support.

[0052] ⑦ To ensure the stability of the bottom support, the first box bottom support also includes two axial channel steels located on the surface of the square steel from the middle of the horizontal section 12 to near the inclined section 13, with a spacing of 1400mm and a laying length of 4600mm.

[0053] ⑧ Two axial channel steels are laid below horizontal section 12 near the entrance, spaced 1400mm apart, with a laying length of 2320mm;

[0054] ⑨ Below the horizontal section 12, near the drain outlet, three channel steels are laid parallel to the central axis. The three channel steels are 1000mm long on the side of the drain outlet near the inclined section 13, and the channel steels on both sides correspond to the two axial channel steels in ⑦. The three channel steels are 495mm long on the side of the drain outlet near the inlet of the horizontal section 12, and the channel steels on both sides correspond to the two axial channel steels in ⑧.

[0055] ⑩ Reinforcing channel steel is laid on both sides of the drain outlet along the axial direction. The channel steel is 4000mm long and the two ends are connected to the first base plate 31 and the second base plate 32 respectively. The bottom reinforcing rib plate 2 is set to avoid the drain outlet.

[0056] ⑪ A reinforcing rib 34 is provided on the support rod 33 at the outlet of the inclined section 13. The two ends of the reinforcing rib 34 are respectively connected to the upper end of the support rod 33 at the outlet and the end of the first base plate 31 or the second base plate 32. Square steel is provided between the reinforcing ribs 34 and between the two sets of corresponding support rods 33 near the outlet of the inclined section 13. The height of the square steel from the external mounting base is 1300mm and the length is 4000mm.

[0057] ⑫ Axial reinforcement of inclined section 13: A square steel bar with a length of 2100mm is laid below the square steel bar at the bottom of inclined section 13 near the outlet position along the central axis.

[0058] ⑬ All support rods 33 are square steel. In the second box bottom support, the heights of the support rods 33 from the initial opening of the inclined section 13 to the inlet of the horizontal section 12 are 2600mm, 2278mm, 1820mm, 1350mm, 880mm, and 870mm respectively. In the first box bottom support, the height of the support rods 33 is 500mm.

[0059] The first box bottom support is fixed to the T-shaped channel steel rail pre-embedded on the mounting base by T-bolts. The total weight of the horizontal section 12 of the gas diverter is about 30 tons, and the total weight of the inclined section 13 is about 60 tons. The second box bottom support is fixed to the T-shaped channel steel rail pre-embedded on the mounting base of the civil engineering concrete structure by T-bolts.

[0060] The cooling unit includes a cooling water source, four spray pipes 14 evenly distributed circumferentially along the inner wall of the horizontal section 12 of the gas guide tube 1, a spray ring located at the inlet of the gas guide tube 1, four spray pipes 14 evenly distributed circumferentially along the inner wall of the inclined section 13 of the gas guide tube 1, a cooling water tank 15 located at the bottom of the inclined section 13, and a piping module connecting the cooling water source, the spray pipes 14, the spray ring, and the cooling water tank 15. The piping module is arranged as follows: Figure 6 As shown, the cooling water source is connected to the cooling water source between the water valves through a DN600 manifold. A DN600 manual valve is installed on the manifold to control the on / off state. The manifold is connected to the cooling water source through three DN400 connecting pipes. A DN400 cylindrical shut-off valve is installed on each of the three DN400 connecting pipes, which can be opened as needed to control the flow rate of the manifold. The underground collection pipe leads to the gas diversion device. After emerging from the ground, it splits into three lines: a first supply line and a second supply line with a diameter of DN300, and a third supply line with a diameter of DN400. The outlet of the first supply line is equipped with four DN150 cooling water pipes and one DN100 cooling water pipe, which connect to four spray pipes 14 and a spray ring located in the horizontal section 12 of the gas diversion cylinder 1. The outlet of the second supply line is also equipped with four DN150 cooling water pipes, connecting to four spray pipes 14 located in the inclined section 13. Electromagnetic flow meters 4 and orifice plates 41 are installed on the first and second supply lines, respectively. The third supply line, through three DN200 cooling water pipes and one DN150 cooling water pipe, connects to four cooling water tanks 15. Electromagnetic flow meters 4 and orifice plates 41 are installed on the four cooling water pipes connecting to the cooling water tanks 15. Each cooling water tank 15 is equipped with a DN32 drain pipe at its lowest point, which flows into a DN50 collection pipe. A pneumatic shut-off valve is installed to drain the liquid after the test run to prevent water accumulation in the tank plate and pipeline.

[0061] In this embodiment, a total of 13 cooling water pipes are provided, including 8 spray pipes, 1 spray ring, and 4 cooling water pipes connected to the cooling water tank. The spray pipes 14 of the horizontal section 12 and the inclined section 13 are DN150 and are respectively arranged axially at the four corners of the horizontal section 12 and the inclined section 13 of the gas guide tube 1. The spray pipes 14 of the horizontal section 12 are arranged with a spray point every 100mm axially. Each spray point includes 4 Φ2.5mm spray holes (1600 in total) and 1 Φ5mm spray hole (400 in total) arranged circumferentially along the spray pipe 14. Figure 7As shown, the Φ5mm spray holes are oriented towards the central axis, and four Φ2.5mm spray holes are respectively located on both sides of the Φ5mm spray hole. The two outermost Φ2.5mm spray holes are oriented towards the inner wall of the adjacent horizontal section 12 or inclined section 13 to spray water onto the inner wall, forming a water film protection to ensure that the cylinder wall is not ablated under the action of gas. A water spray point is arranged every 80mm on the water pipe of the inclined section 13, with four Φ2.5mm spray holes (1300 in total) and one Φ5mm spray hole (325 in total) at each point. The spray ring is rectangular and is set corresponding to the inlet of the gas guide cylinder 1. One Φ5mm spray hole (200 in total) is arranged on the spray ring every 80mm. The spray holes spray water into the inlet of the horizontal section 12, forming an ejector effect to prevent water droplets inside the cylinder from splashing and affecting the engine. According to calculations, in this embodiment, the water flow rate of each spray pipe 14 in the horizontal section 12 is 0.113 m³ / s, the water flow rate of each spray pipe 14 in the inclined section 13 is 0.09 m³ / s, and the water flow rate of the spray ring is 0.1 m³ / s. 3 / s, total cooling water flow rate is 0.9m³ / s. 3 / s. The minimum outlet velocity of the spray nozzles on spray pipe 14 is 28.8 m / s.

[0062] Based on the erosion and heat load of the gas guide tube 1 under various test conditions, the upper surface of the cooling water tank 15 of the inclined section 13 is divided into a core area and a diffusion area, such as... Figure 9 As shown, the core area (areas B, C, and D) is the region directly impacted by the combustion gases during fixed-point testing; the diffusion area (area A) is the region not directly impacted by the combustion gases. Under the same cooling conditions, the core area experiences the most severe ablation, while the diffusion area, with its shorter flame scouring time and greater distance from the core area, exhibits virtually no ablation. Therefore, the size, layout, and orientation of the corresponding water jet holes were organized according to the cooling requirements of different areas. The geometric parameters of the water jet holes are detailed in Table 1.

[0063] Table 1 Geometric parameters of the water jet orifice

[0064]

[0065] Table 2 shows the nozzle arrangement scheme for different ablation zones of cooling water tank 15. Based on calculations, the required cooling water volume for the core area is 1.16 m³. 3 / s, the required cooling water volume for the diffusion zone is 0.11 m³ / s. 3 / s, the total cooling water flow rate is 1.27m³ / s. 3 / s. The angle between the water spray nozzle of the coolant tank 15 and its central axis is 30°. After installation, the water spray angle with the vertical direction is 15°, and the direction is towards the gas outlet to prevent water mist from returning to the engine.

[0066] Table 2 Cooling water tank spray holes and inlet pipes

[0067]

[0068] Table 3 Main Technical Specifications of Cooling Unit

[0069]

[0070] The total cooling water flow rate of cooling water tank 15 is 1.27 m³ / s. 3 / s, the core area requires 1.16 m³ of cooling water. 3 / s, the required cooling water volume for the diffusion zone is 0.11 m³ / s. 3 / s. The total flow rate of the cooling water pipes is 0.9m. 3 / s, horizontal section 12 single pipe water flow rate 0.113m³ / s 3 / s, single pipe flow rate of inclined section 13: 0.09m³ / s 3 / s, water circulation volume 0.1m 3 / s, as shown in Table 3.

Claims

1. A gas flow guiding device for a horizontal engine test stand, characterized in that: It includes a gas flow guide tube (1), a cooling unit, and a mounting bracket (3) located below the gas flow guide tube (1). The gas guide tube (1) includes a horizontal section (12) and an inclined section (13) connected in sequence. The horizontal section (12) and the inclined section (13) are detachably connected, so that some components can be easily removed when conducting high-mode tests, providing a clear interface and physical space for installing an air-venting diffuser, and enabling a single test bench platform to perform two different types of test tasks. The bottom of the horizontal section (12) is provided with a drain outlet, and the inlet of the horizontal section (12) is set to correspond to the engine outlet; the inclined section (13) is inclined upward to guide the gas. The cooling unit includes multiple spray pipes (14) arranged along the inner walls of the horizontal section (12) and the inclined section (13), and multiple cooling water tanks (15) arranged at the bottom of the inclined section (13); the spray pipes (14) and the cooling water tanks (15) are respectively connected to a cooling water source; Multiple water spray holes are uniformly arranged on the upper surface of the multiple cooling water tanks (15) and communicate with the inclined section (13), and the water spray holes are inclined towards the outlet of the inclined section (13); The mounting bracket (3) is located below the horizontal section (12) and the inclined section (13) and is used to fix and support them.

2. The gas flow guiding device for a horizontal engine test stand according to claim 1, characterized in that: The spray pipe (14) is arranged along the axial direction of the horizontal section (12) and the inclined section (13), and the plurality of spray pipes (14) are evenly distributed along the circumference of the horizontal section (12) and the inclined section (13); Multiple water spray points are spaced apart along the axial direction on the spray pipe (14). Each water spray point includes at least three spray holes arranged circumferentially along the spray pipe (14). The spray hole located in the middle position is arranged facing the central axis of the horizontal section (12) or the inclined section (13). The two outermost spray holes are arranged facing the side wall of the adjacent horizontal section (12) or the inclined section (13) respectively, for spraying water onto the inner side wall to form a water film for protection.

3. The gas flow guiding device for a horizontal engine test stand according to claim 2, characterized in that: The cooling unit also includes a spray ring circumferentially arranged at the inlet of the horizontal section (12), and the spray ring is evenly provided with multiple spray holes facing the inlet of the horizontal section (12).

4. The gas flow guiding device for a horizontal engine test stand according to claim 3, characterized in that: In each spray point on the spray pipe (14), the diameter of the spray hole in the middle position is larger than the diameter of the spray holes on both sides.

5. The gas flow guiding device for a horizontal engine test stand according to claim 4, characterized in that: The number of spray pipes (14) in the horizontal section (12) and the inclined section (13) are 4 each, and they are respectively set on the upper and lower sides of the horizontal section (12) and the inclined section (13); The spray points on the spray pipe (14) of the horizontal section (12) are spaced 100mm apart; The spray points on the spray pipe (14) of the inclined section (13) are spaced 80 mm apart.

6. The gas flow guiding device for a horizontal engine test stand according to claim 1, characterized in that: By definition, the upper surface of the cooling water tank (15) near the outlet of the inclined section (13) is the core area, and the upper surface of the cooling water tank (15) away from the outlet is the diffusion area. The core area is the area directly impacted by the gas. The number and diameter of the water spray holes on the upper surface of the cooling water tank (15) in the core area are greater than the number and diameter of the water spray holes in the diffusion area.

7. The gas flow guiding device for a horizontal engine test stand according to claim 6, characterized in that: The water spray volume of the water jet of the cooling water tank (15) located away from the outlet of the inclined section (13) is less than that of the other cooling water tanks (15); The cooling water tank (15) is equipped with a drain pipe at its lowest point for draining the cooling water.

8. The gas flow guiding device for a horizontal engine test stand according to claim 7, characterized in that: The number of cooling water tanks (15) is four, which are arranged in sequence along the central axis direction at the bottom of the inclined section (13) near the outlet position, corresponding to the gas impact area; The total length of the four cooling water tanks (15) along the central axis is 4 / 5 of the inclined section (13).

9. The gas flow guiding device for a horizontal engine test stand according to claim 1, characterized in that: The bottom of the horizontal section (12) is sloped, and the low point is near the middle section. The drain outlet is located at the low point, and multiple guide plates (11) are provided on the drain outlet.

10. A gas flow guiding device for a horizontal engine test stand according to any one of claims 1-9, characterized in that: The outer wall of the gas guide tube (1) is provided with a reinforcing rib plate (2) made of Q235B material, and the surface of the reinforcing rib plate (2) is provided with square steel made of Q235B material. The gas guide tube (1) has a rectangular cross-section and is formed by welding Q235B steel plates; The upper surface of the cooling water tank (15) is made of Q245R, and the rest is made of Q235B.

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