A jet impact enhanced heat exchange device for casing heating

Abstract

The present invention discloses a jet impact enhanced heat exchange device for casing heating, comprising a down-conversion stage, a lower air intake section, a test casing section, an upper exhaust section and an up-conversion stage, wherein the test casing section is arranged between the upper exhaust section and the lower air intake section, the upper portion of the upper exhaust section is connected to the up-conversion stage, and the lower portion of the lower air intake section is connected to the down-conversion stage; a jet impact inner sleeve is also installed on the inner wall between the down-conversion stage and the up-conversion stage, the jet impact inner sleeve comprises a pressure-bearing layer, an inner layer, a middle layer, an outer layer and a guide column, and four cavities are formed, namely a reflux cavity formed between the middle layer and the outer layer, an air intake cavity formed between the inner layer and the middle layer, an insulation cavity formed between the pressure-bearing layer and the inner layer, and a jet impact cavity formed between the outer layer and the test casing section, the device is used to achieve uniform heating of the test casing section and reduce the circumferential and axial temperature differences of the test casing section.

Description

Technical Field

[0001] The present invention belongs to the field of heat exchange and heat transfer equipment, and specifically relates to a jet impact enhanced heat exchange device for casing heating, which is used to reduce the circumferential and axial temperature differences of a test casing section during heating. Background Art

[0002] During the operation of an aircraft engine, different casing sections are connected front and back, and the inner wall surfaces together form a complete outer duct airflow wall surface, which is subjected to the erosion of high-temperature and high-speed airflow. The casing must have sufficient rigidity and strength to prevent the casing from deformation and instability under high temperature conditions to ensure that the engine airflow field meets the design requirements. During the operation of the engine casing, the casing load conditions and the complexity of the load-bearing structure make the design and assessment of the casing's structural strength a key issue, and the casing must be subjected to thermal fatigue testing.

[0003] During the heating test of an aircraft engine casing, the casing needs to be heated uniformly to ensure that the casing is heated properly. Currently, commonly used casing heating methods include environmental chamber heating, heating plate heating, and air heating. Compared with environmental chamber heating and heating plate heating, air heating can most realistically simulate the operating state of the casing. However, the current air heating method still has the problem of poor heating temperature uniformity, which is specifically manifested in a large temperature difference between the circumferential and axial directions of the test casing during heating. Summary of the Invention

[0004] The purpose of the present invention is to provide a jet impact enhanced heat exchange device for casing heating, which is used to achieve uniform heating of the test casing section and reduce the circumferential and axial temperature differences of the test casing section, so as to facilitate subsequent verification of the structural strength of the test casing section.

[0005] In order to achieve the above-mentioned objectives, the present invention provides a jet impact enhanced heat exchange device for casing heating, comprising a downward transfer stage, a lower air intake section, a test casing section, an upper exhaust section and an upward transfer stage, wherein the test casing section is arranged between the upper exhaust section and the lower air intake section, the upper part of the upper exhaust section is connected to the upward transfer stage, and the lower part of the lower air intake section is connected to the downward transfer stage; a jet impact inner sleeve is also installed on the inner wall between the downward transfer stage and the upward transfer stage, and the jet impact inner sleeve comprises a pressure-bearing layer, an inner layer, a middle layer, an outer layer and a guide column, the pressure-bearing layer is arranged on the inner side of the inner layer, and the guide column is arranged between the middle layer and the outer layer, and four cavities are formed, namely a reflux chamber formed between the middle layer and the outer layer, an air intake chamber formed between the inner layer and the middle layer, an insulation chamber formed between the pressure-bearing layer and the inner layer, and a jet impact chamber formed between the outer layer and the test casing section; a jet impact hole and a reflux hole are also provided on the outer layer.

[0006] Furthermore, bolts are used to connect the lower rotation stage and the lower air intake section, the lower air intake section and the test casing section, the test casing section and the upper exhaust section, and the upper exhaust section and the upper rotation stage, and sealing gaskets are provided between adjacent connection surfaces.

[0007] Furthermore, a shaft sealing ring is provided between the surface of the pressure-bearing layer and the contact surfaces of the lower rotation stage and the upper rotation stage.

[0008] Furthermore, the lower air intake section is provided with four air inlets, namely lower air intake section air inlet 1, lower air intake section air inlet 2, lower air intake section air inlet 3 and lower air intake section air inlet 4, and a docking flange is provided on each of the four air inlets for docking with an external hot air intake duct to introduce hot air into the test casing section.

[0009] Furthermore, the upper exhaust section is provided with four exhaust ports, namely upper exhaust section exhaust port 1, upper exhaust section exhaust port 2, upper exhaust section exhaust port 3 and upper exhaust section exhaust port 4, and each of the four exhaust ports is provided with a docking flange for docking with an external exhaust air duct to discharge the hot air in the test casing section.

[0010] Furthermore, the lower air inlet section air inlet one, the lower air inlet section air inlet two, the lower air inlet section air inlet three and the lower air inlet section air inlet four are provided with a circle of evenly distributed air inlet holes at the same horizontal plane as the middle layer.

[0011] Furthermore, the upper exhaust section exhaust port 1, the upper exhaust section exhaust port 2, the upper exhaust section exhaust port 3 and the upper exhaust section exhaust port 4, the four exhaust ports are provided with a circle of evenly distributed exhaust holes at the same horizontal plane as the outer layer.

[0012] Furthermore, the total area of ​​the jet impact holes is not greater than the sum of the cross-sectional areas of the four air inlet pipelines: the first air inlet of the lower air inlet section, the second air inlet of the lower air inlet section, the third air inlet of the lower air inlet section, and the fourth air inlet of the lower air inlet section.

[0013] Furthermore, the two ends of the guide column are welded to the middle layer and the outer layer respectively. The guide column is a hollow structure, connecting the air inlet cavity and the jet impact cavity.

[0014] Furthermore, the reflux hole communicates with the reflux chamber and the jet impact chamber.

[0015] Compared with the prior art, the present invention has the following advantages: 1. During heating, hot air enters the air intake cavity through the air intake hole, and then enters the jet impact cavity through the hollow guide column and the jet impact hole, and performs jet impact enhanced heating on the test casing section. Since the total area of ​​the jet impact holes is not larger than the sum of the cross-sectional areas of the four air inlet pipelines of the lower air intake section one, the lower air intake section two, the lower air intake section three and the lower air intake section four, the hot air flowing through the jet impact holes is accelerated, further improving the jet impact enhanced heat exchange effect of the hot air, and ensuring that the mass flow rate of the hot air flowing out of each jet impact hole is equal, ensuring that the test casing section is heated evenly, and reducing the circumferential and axial temperature differences of the test casing section.

[0016] 2. The jet impact inner sleeve includes a pressure-bearing layer, an inner layer, a middle layer, an outer layer and a guide column, forming four cavities, namely the return chamber formed between the middle layer and the outer layer, the air intake chamber formed between the inner layer and the middle layer, the heat preservation chamber formed between the pressure-bearing layer and the inner layer, and the jet impact chamber formed between the outer layer and the test casing section; among them, the air intake chamber completes the introduction of hot air, the heat preservation chamber isolates the air inside the jet impact chamber from direct contact with the cold air outside the test casing section, the hot air in the jet impact chamber is dispersed and rebounded by the inner surface of the test casing section, and after completing the jet impact heat exchange, the return chamber is cooperated to complete the discharge of hot air, so as to achieve the purpose of uniformly heating the test casing section and reducing the circumferential and axial temperature differences of the test casing section.

[0017] 3. The lower rotation stage, lower air intake section, test casing section, upper exhaust section, upper rotation stage and jet impact inner sleeve are all cylindrical structures for easy installation and docking. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a three-dimensional diagram of the casing jet impact enhanced heat exchange device of the present invention;

[0019] Figure 2 This is a three-dimensional diagram of the jet impacting the inner sleeve of the present invention;

[0020] Figure 3 This is a front view of the jet impacting the inner sleeve of the present invention;

[0021] Figure 4 yes Figure 3 A partial enlarged view of point C in the middle;

[0022] Figure 5 yes Figure 3 A-direction sectional view;

[0023] Figure 6 yes Figure 5 A partial enlarged view of point B in the middle;

[0024] Figure 7 This is a cross-sectional view of the assembly of the casing heating jet impact enhanced heat exchange device of the present invention;

[0025] Figure 8 This is a temperature distribution data diagram after the casing jet impact enhanced heat exchange heating of the present invention;

[0026] Among them: 100-downward rotation stage; 200-lower air intake section; 201-lower air intake section air intake 1; 202-lower air intake section air intake 2; 203-lower air intake section air intake 3; 204-lower air intake section air intake 4; 300-test casing section; 400-upper exhaust section; 401-upper exhaust section exhaust 1; 402-upper exhaust section exhaust 2; 403-upper exhaust section exhaust 3; 404-upper exhaust section exhaust 4; 500-upward rotation stage; 600-jet impact inner sleeve; 601-pressure-bearing layer; 602-inner layer; 603-middle layer; 604-outer layer; 605-jet impact hole; 606-return hole; 607-air inlet hole; 608-guide column; 609-return chamber; 610-air inlet chamber; 611-insulation chamber; 612-jet impact chamber; 613-exhaust hole; 701-shaft sealing ring; 702-sealing gasket. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] like Figure 1-7 As shown, a jet impact enhanced heat exchange device for casing heating includes a lower transfer stage 100, a lower air intake section 200, a test casing section 300, an upper exhaust section 400 and an upper transfer stage 500. The test casing section 300 is arranged between the upper exhaust section 400 and the lower air intake section 200. The upper portion of the upper exhaust section 400 is connected to the upper transfer stage 500, and the lower portion of the lower air intake section 200 is connected to the lower transfer stage 100. A jet impact inner sleeve 600 is further installed on the inner wall between the lower transfer stage 100 and the upper transfer stage 500. The jet impact inner sleeve 600 includes a pressure-bearing layer 601, an inner layer 602, The middle layer 603, the outer layer 604 and the guide column 608, the pressure-bearing layer 601 is arranged on the inner side of the inner layer 602, the guide column 608 is arranged between the middle layer 603 and the outer layer 604, and four cavities are formed, namely the reflux cavity 609 formed between the middle layer 603 and the outer layer 604, the air intake cavity 610 formed between the inner layer 602 and the middle layer 603, the heat preservation cavity 611 formed between the pressure-bearing layer 601 and the inner layer 602, and the jet impact cavity 612 formed between the outer layer 604 and the test casing section 300; the outer layer 604 is also provided with a jet impact hole 605 and a reflux hole 606.

[0029] During specific installation: bolts are used to connect the lower rotation stage 100 and the lower air intake section 200, the lower air intake section 200 and the test casing section 300, the test casing section 300 and the upper exhaust section 400, and the upper exhaust section 400 and the upper rotation stage 500, and sealing gaskets 702 are arranged between adjacent connection surfaces. The test casing section 300 is arranged between the lower air intake section 200 and the upper exhaust section 400; the jet impact inner sleeve 600 is floatingly installed between the lower rotation stage 100 and the upper rotation stage 500, and a shaft sealing ring 701 is arranged between the surface of the jet impact inner sleeve 600 and the pressure bearing layer 601 and the contact surface of the lower rotation stage 100 and the upper rotation stage 500. The shaft sealing ring 701 is used for sealing to prevent leakage of hot air.

[0030] The lower transition section 100 is usually installed on a supporting base such as the ground or a load-bearing platform using bolts, thereby fixing the entire casing heating device.

[0031] The lower air intake section 200 is provided with four air intakes, namely lower air intake section air intake port 1 201, lower air intake section air intake port 2 202, lower air intake section air intake port 3 203 and lower air intake section air intake port 4 204, and each of the four air intakes is provided with a docking flange for docking with an external hot air intake pipe to introduce hot air into the test casing section.

[0032] The upper exhaust section 400 is provided with four exhaust ports, namely upper exhaust section exhaust port 1 401, upper exhaust section exhaust port 2 402, upper exhaust section exhaust port 3 403 and upper exhaust section exhaust port 4 404, and each of the four exhaust ports is provided with a docking flange for docking with an external exhaust air duct to discharge the hot air in the test casing section.

[0033] The four air inlets of the lower air inlet section, namely, the lower air inlet section air inlet 1 201 , the lower air inlet section air inlet 2 202 , the lower air inlet section air inlet 3 203 and the lower air inlet section air inlet 4 204 , are provided with a circle of evenly distributed air inlet holes 607 at the same horizontal plane as the middle layer 603 .

[0034] The four exhaust ports of the upper exhaust section exhaust port 1 401 , the upper exhaust section exhaust port 2 402 , the upper exhaust section exhaust port 3 403 and the upper exhaust section exhaust port 4 404 are provided with a circle of evenly distributed exhaust holes 613 at the same horizontal plane as the outer layer 604 .

[0035] The total area of ​​the jet impact holes 605 is not greater than the sum of the cross-sectional areas of the four air inlet pipelines of the lower air inlet section 1 201 , the lower air inlet section 202 , the lower air inlet section 3 203 and the lower air inlet section 4 204 .

[0036] It should be noted that: the pressure-bearing layer 601 is the innermost layer of the jet impact inner sleeve 600, which is composed of a complete cylinder and is used to withstand the gas pressure inside the heating chamber; the guide column 608 is arranged between the middle layer 603 and the outer layer 604, and the two ends of the guide column 608 are welded to the middle layer 603 and the outer layer 604 respectively. The guide column 608 is a hollow structure, connecting the air inlet chamber 610 and the jet impact chamber 612; the outer layer 604 is provided with a jet impact hole 605 and a return hole 606, wherein the return hole 606 connects the return chamber 609 and the jet impact chamber 612.

[0037] The working process of the casing jet impact enhanced heat exchange device of the present invention is: before the test starts, the hot air duct needs to be connected to the lower air intake section air inlet 1 201, the lower air intake section air inlet 2 202, the lower air intake section air inlet 3 203 and the lower air intake section air inlet 4 204; the exhaust duct needs to be connected to the upper exhaust section exhaust port 1 401, the upper exhaust section exhaust port 2 402, the upper exhaust section exhaust port 3 403 and the upper exhaust section exhaust port 4 404. Hot air is introduced into the interior of the test casing section from the lower air intake section 200, and the hot air enters the air intake cavity 610 through the air intake hole 607. The hot air then enters the jet impact cavity 612 through the hollow guide column 608 and the jet impact hole 605, and performs jet impact enhanced heating on the test casing section 300. Since the total area of ​​the jet impact hole 605 is not greater than the sum of the cross-sectional areas of the four air inlet pipes of the lower air intake section air inlet 1 201, the lower air intake section air inlet 202, the lower air intake section air inlet 3 203 and the lower air intake section air inlet 4 204, the hot air is accelerated when flowing through the jet impact hole 605, further improving the jet impact enhanced heat exchange effect of the hot air, and ensuring that the mass flow rate of the hot air flowing out of each jet impact hole 605 is approximately equal, thereby ensuring that the test casing section 300 is evenly heated. Hot air enters the jet impingement chamber 612, is dispersed and rebounded by the inner surface of the test casing section 300, and after completing the jet impingement heat exchange, flows into the reflow chamber 609 through the reflow holes 606 provided on the outer layer 604, and flows out through the exhaust holes 613 provided on the outer layer 604. Finally, it flows into the exhaust duct through the four exhaust ports provided on the upper exhaust section 400: upper exhaust section exhaust port 1 401, upper exhaust section exhaust port 2 402, upper exhaust section exhaust port 3 403, and upper exhaust section exhaust port 4 404. The intake duct continuously supplies hot air, and through the above process, the hot air will continuously heat the test casing section 300, continuously raising the overall temperature of the test casing section 300, and ultimately achieving uniform heating of the test casing section 300.

[0038] After the test is completed, the hot air is replaced with cold air. Through the above process, the cold air can achieve rapid cooling of the test casing section 300.

[0039] By controlling the temperature of the air in the air intake duct, the heating temperature control of the test casing section 300 can be completed, thereby realizing the alternating cycle test condition of heating the test casing section 300 at high and low temperatures.

[0040] Heat the test casing to the required temperature. Figure 8 As shown, the temperature of the upper and lower ends of the test casing segment 300 transitions evenly, wherein the upper end of the casing is between 335°C and 347.5°C, and the lower end of the casing is between 351.5°C and 360.5°C. The temperature difference of the test casing segment 300 is within the required range, indicating that the jet impact enhanced heat exchange device for casing heating achieves uniform heating of the test casing segment and reduces the circumferential and axial temperature differences of the test casing segment.

Claims

1. A jet impact enhanced heat exchange device for casing heating, characterized in that: The invention comprises a lower rotation stage (100), a lower air intake section (200), a test casing section (300), an upper exhaust section (400) and an upper rotation stage (500), wherein the test casing section (300) is arranged between the upper exhaust section (400) and the lower air intake section (200), the upper portion of the upper exhaust section (400) is connected to the upper rotation stage (500), and the lower portion of the lower air intake section (200) is connected to the lower rotation stage (100); a jet impact inner sleeve (600) is further installed on the inner wall between the lower rotation stage (100) and the upper rotation stage (500), and the jet impact inner sleeve (600) comprises a pressure-bearing layer (601), an inner layer (602), a middle layer (603), an outer layer (604) and The guide column (608) is provided on the inner side of the inner layer (602), and the guide column (608) is provided between the middle layer (603) and the outer layer (604), and is provided with four cavities, namely, a reflux cavity (609) formed between the middle layer (603) and the outer layer (604), an air intake cavity (610) formed between the inner layer (602) and the middle layer (603), a heat preservation cavity (611) formed between the pressure-bearing layer (601) and the inner layer (602), and a jet impact cavity (612) formed between the outer layer (604) and the test casing section (300); the outer layer (604) is also provided with a jet impact hole (605) and a reflux hole (606); The lower rotation stage (100) and the lower air intake section (200), the lower air intake section (200) and the test casing section (300), the test casing section (300) and the upper exhaust section (400), and the upper exhaust section (400) and the upper rotation stage (500) are all connected using bolts, and sealing gaskets (702) are provided between adjacent connection surfaces; The lower air inlet section (200) is provided with four air inlets, namely, lower air inlet section air inlet 1 (201), lower air inlet section air inlet 2 (202), lower air inlet section air inlet 3 (203) and lower air inlet section air inlet 4 (204), and each of the four air inlets is provided with a docking flange for docking with an external hot air intake duct to introduce hot air into the test casing section; The four air inlets of the lower air inlet section, namely, the air inlet 1 (201), the air inlet 2 (202), the air inlet 3 (203) and the air inlet 4 (204) of the lower air inlet section, are provided with a circle of evenly distributed air inlet holes (607) at the same level as the middle layer (603); The total area of ​​the jet impact holes (605) is no greater than the sum of the cross-sectional areas of the four air inlet pipes, namely, the lower air inlet section air inlet one (201), the lower air inlet section air inlet two (202), the lower air inlet section air inlet three (203) and the lower air inlet section air inlet four (204).

2. The jet impact enhanced heat exchange device for casing heating according to claim 1, characterized in that: A shaft sealing ring (701) is further provided between the surface of the pressure-bearing layer (601) and the contact surfaces of the lower rotation stage (100) and the upper rotation stage (500).

3. The jet impact enhanced heat exchange device for casing heating according to claim 1, characterized in that: The upper exhaust section (400) is provided with four exhaust ports, namely, upper exhaust section exhaust port 1 (401), upper exhaust section exhaust port 2 (402), upper exhaust section exhaust port 3 (403) and upper exhaust section exhaust port 4 (404), and each of the four exhaust ports is provided with a docking flange for docking with an external exhaust air duct to discharge the hot air in the test casing section.

4. The jet impact enhanced heat exchange device for casing heating according to claim 3, characterized in that: The four exhaust ports, namely, the upper exhaust port 1 (401), the upper exhaust port 2 (402), the upper exhaust port 3 (403) and the upper exhaust port 4 (404), are provided with a circle of evenly distributed exhaust holes (613) at the same horizontal plane as the outer layer (604).

5. The jet impact enhanced heat exchange device for casing heating according to claim 1, characterized in that: The two ends of the guide column (608) are respectively welded to the middle layer (603) and the outer layer (604). The guide column (608) is a hollow structure that connects the air inlet cavity (610) and the jet impact cavity (612).

6. The jet impact enhanced heat exchange device for casing heating according to claim 1, characterized in that: The reflux hole (606) is connected to the reflux chamber (609) and the jet impact chamber (612).

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