Jet impact enhanced heat exchange device for heating cartridge receiver

Abstract

The invention discloses a jet impact enhanced heat exchange device for casing heating, which comprises a lower rotation stage, a lower air inlet stage, a test casing section, an upper exhaust section and an upper rotation stage, the test casing section is arranged between the upper exhaust section and the lower air inlet section, the upper rotation stage is connected to the upper part of the upper exhaust section, and the lower rotation stage is connected to the lower part of the lower air inlet section; a jet flow impact inner sleeve is further mounted on the inner wall between the lower rotating stage and the upper rotating stage, comprises a pressure bearing layer, an inner layer, a middle layer, an outer layer and a flow guide column, and forms four cavities, namely a backflow cavity formed between the middle layer and the outer layer and an air inlet cavity formed between the inner layer and the middle layer; the heat preservation cavity is formed between the pressure bearing layer and the inner layer, the jet flow impact cavity is formed between the outer layer and the test casing section, and the device is used for achieving uniform heating of the test casing section and reducing the circumferential and axial temperature difference of the test casing section.

Description

Technical Field

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

[0002] During the operation of an aeroengine, different casing sections are connected in series front and back, and the inner wall surfaces together form a complete outer bypass duct air flow wall surface. Subject to the scouring of high-temperature and high-speed air flow, the casing must have sufficient stiffness and strength to prevent the casing from deforming and losing stability under high-temperature conditions, so as to ensure that the engine air flow field meets the design requirements. During the operation of the engine casing, due to the complexity of the loading conditions and the bearing structure of the casing, the design and evaluation of the structural strength of the casing become key issues, and it is necessary to conduct thermal fatigue tests on the casing.

[0003] In the aeroengine casing heating test, it is necessary to uniformly heat the casing to ensure the casing during the heating test. Currently, the commonly used casing heating methods include environmental chamber heating, heating plate heating, air heating, etc. Air heating can most realistically simulate the use state of the casing compared with environmental chamber heating and heating plate heating. However, the current air heating method still has the problem of poor heating temperature uniformity, specifically manifested as a relatively large circumferential and axial temperature difference of the test casing during heating. Summary of the Invention

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

[0005] To achieve the above purpose, the present invention provides a jet impingement enhanced heat transfer device for casing heating, including a lower turning stage, a lower air intake section, a test casing section, an upper exhaust section, and an upper turning stage. 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 upper turning stage, and the lower part of the lower air intake section is connected to the lower turning stage. A jet impingement inner sleeve is also installed on the inner wall between the lower turning stage and the upper turning stage. The jet impingement inner sleeve includes a pressure-bearing layer, an inner layer, a middle layer, an outer layer, and a flow guiding column. The pressure-bearing layer is arranged inside the inner layer, and the flow guiding column is arranged between the middle layer and the outer layer, and four cavities are formed, namely a return cavity formed between the middle layer and the outer layer, an air intake cavity formed between the inner layer and the middle layer, a heat preservation cavity formed between the pressure-bearing layer and the inner layer, and a jet impingement cavity formed between the outer layer and the test casing section. Jet impingement holes and return holes are also arranged on the outer layer.

[0006] Further, bolts are used to connect between the downward rotation stage and the downward air intake section, between the downward air intake section and the test engine casing section, between the test engine casing section and the upward exhaust section, and between the upward exhaust section and the upward rotation stage, and sealing washers are provided between adjacent connection surfaces.

[0007] Further, shaft seals are also provided between the surface of the pressure-bearing layer and the contact surfaces of the downward rotation stage and the upward rotation stage.

[0008] Further, the downward air intake section is provided with four air inlets, namely the downward air intake section air inlet 1, the downward air intake section air inlet 2, the downward air intake section air inlet 3, and the downward air intake section air inlet 4, and docking flanges are provided on all four air inlets for docking with an external hot air intake pipeline to introduce hot air into the test engine casing section.

[0009] Further, the upward exhaust section is provided with four exhaust outlets, namely the upward exhaust section exhaust outlet 1, the upward exhaust section exhaust outlet 2, the upward exhaust section exhaust outlet 3, and the upward exhaust section exhaust outlet 4, and docking flanges are provided on all four exhaust outlets for docking with an external exhaust air pipeline to discharge the hot air in the test engine casing section.

[0010] Further, a circle of evenly distributed air intake holes is provided at positions of the four air inlets, namely the downward air intake section air inlet 1, the downward air intake section air inlet 2, the downward air intake section air inlet 3, and the downward air intake section air inlet 4, which are on the same horizontal plane as the middle layer.

[0011] Further, a circle of evenly distributed exhaust holes is provided at positions of the four exhaust outlets, namely the upward exhaust section exhaust outlet 1, the upward exhaust section exhaust outlet 2, the upward exhaust section exhaust outlet 3, and the upward exhaust section exhaust outlet 4, which are on the same horizontal plane as the outer layer.

[0012] Further, the total area of the jet impact holes is not greater than the sum of the cross-sectional areas of the pipelines of the four air inlets, namely the downward air intake section air inlet 1, the downward air intake section air inlet 2, the downward air intake section air inlet 3, and the downward air intake section air inlet 4.

[0013] Further, both ends of the flow guiding column are welded to the middle layer and the outer layer respectively. The flow guiding column is a hollow structure that connects the air intake cavity and the jet impact cavity.

[0014] Further, the return hole connects the return cavity and the jet impact cavity.

[0015] The present invention has the following advantages compared with the prior art: 1. During heating, hot air enters the intake cavity through the air inlet holes, and then enters the jet impingement cavity through the hollow guide column and jet impingement holes, performing jet impingement enhanced heating on the test engine casing section. Since the total area of the jet impingement holes is not greater than the sum of the cross-sectional areas of the four intake ports, namely the first intake port of the lower intake section, the second intake port of the lower intake section, the third intake port of the lower intake section, and the fourth intake port of the lower intake section, the hot air flowing through the jet impingement holes is accelerated, further improving the jet impingement enhanced heat transfer effect of the hot air and ensuring that the mass flow rate of the hot air flowing out of each jet impingement hole is equal, ensuring uniform heating of the test engine casing section and reducing the circumferential and axial temperature differences of the test engine casing section.

[0016] 2. The jet impingement 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 cavity formed between the middle layer and the outer layer, the intake cavity formed between the inner layer and the middle layer, the heat insulation cavity formed between the pressure-bearing layer and the inner layer, and the jet impingement cavity formed between the outer layer and the test engine casing section; among them, the intake cavity completes the introduction of hot air, the heat insulation cavity isolates the direct contact between the air inside the jet impingement cavity and the cold air outside the test engine casing section, the hot air in the jet impingement cavity is dispersed and rebounded by the inner surface of the test engine casing section, and after completing the jet impingement heat transfer, it cooperates with the return cavity to complete the export of hot air, achieving the purpose of uniformly heating the test engine casing section and reducing the circumferential and axial temperature differences of the test engine casing section.

[0017] 3. The lower turning stage, the lower intake section, the test engine casing section, the upper exhaust section, the upper turning stage, and the jet impingement inner sleeve are all cylindrical structures, which are convenient for installation and docking. Description of the Drawings

[0018] Figure 1 is a three-dimensional view of the casing jet impingement enhanced heat transfer device of the present invention; Figure 2 is a three-dimensional view of the jet impingement inner sleeve of the present invention; Figure 3 is a front view of the jet impingement inner sleeve of the present invention; Figure 4 is Figure 3 a partial enlarged view at C in Figure 5 is Figure 3 a sectional view taken along the direction A of Figure 6 is Figure 5 a partial enlarged view at B in Figure 7 is a sectional view of the assembly of the casing heating jet impingement enhanced heat transfer device of the present invention; Figure 8 is a temperature distribution data diagram after heating of the casing jet impingement enhanced heat transfer of the present invention; Wherein: 100 - lower rotation stage; 200 - lower intake section; 201 - first intake port of the lower intake section; 202 - second intake port of the lower intake section; 203 - third intake port of the lower intake section; 204 - fourth intake port of the lower intake section; 300 - test casing section; 400 - upper exhaust section; 401 - first exhaust port of the upper exhaust section; 402 - second exhaust port of the upper exhaust section; 403 - third exhaust port of the upper exhaust section; 404 - fourth exhaust port of the upper exhaust section; 500 - upper rotation stage; 600 - jet impingement inner sleeve; 601 - pressure-bearing layer; 602 - inner layer; 603 - middle layer; 604 - outer layer; 605 - jet impingement holes; 606 - return holes; 607 - intake holes; 608 - flow guide columns; 609 - return cavity; 610 - intake cavity; 611 - heat preservation cavity; 612 - jet impingement cavity; 613 - exhaust holes; 701 - shaft seal ring; 702 - sealing washer. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] As Figure 1-7 shown, a jet impingement enhanced heat transfer device for casing heating includes a lower rotation stage 100, a lower intake section 200, a test casing section 300, an upper exhaust section 400 and an upper rotation stage 500. The test casing section 300 is arranged between the upper exhaust section 400 and the lower intake section 200. The upper rotation stage 500 is connected to the upper part of the upper exhaust section 400, and the lower intake section 200 is connected to the lower part of the lower rotation stage 100. A jet impingement inner sleeve 600 is further installed on the inner wall between the lower rotation stage 100 and the upper rotation stage 500. The jet impingement inner sleeve 600 includes a pressure-bearing layer 601, an inner layer 602, a middle layer 603, an outer layer 604 and flow guide columns 608. The pressure-bearing layer 601 is arranged inside the inner layer 602. The flow guide columns 608 are arranged between the middle layer 603 and the outer layer 604, and four cavities are formed, namely a return cavity 609 formed between the middle layer 603 and the outer layer 604, an 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 impingement cavity 612 formed between the outer layer 604 and the test casing section 300. Jet impingement holes 605 and return holes 606 are further arranged on the outer layer 604.

[0021] During specific installation: bolts are used to connect between the lower rotation stage 100 and the lower air intake section 200, between the lower air intake section 200 and the test engine casing section 300, between the test engine casing section 300 and the upper exhaust section 400, and between the upper exhaust section 400 and the upper rotation stage 500. A sealing washer 702 is provided between adjacent connection surfaces. The test engine 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 seal ring 701 is provided between the surfaces of the jet impact inner sleeve 600 and the pressure-bearing layer 601 and the contact surfaces of the lower rotation stage 100 and the upper rotation stage 500. The shaft seal ring 701 is used for sealing to prevent the leakage of hot air.

[0022] The lower adapter section 100 is usually installed on a support base such as the ground or a load-bearing platform using bolts, thereby fixing the entire engine casing heating device.

[0023] Four air inlets, namely the lower air intake section air inlet one 201, the lower air intake section air inlet two 202, the lower air intake section air inlet three 203, and the lower air intake section air inlet four 204, are provided on the lower air intake section 200. Docking flanges are provided on all four air inlets for docking with an external hot air intake pipeline to introduce hot air into the test engine casing section.

[0024] Four exhaust ports, namely the upper exhaust section exhaust port one 401, the upper exhaust section exhaust port two 402, the upper exhaust section exhaust port three 403, and the upper exhaust section exhaust port four 404, are provided on the upper exhaust section 400. Docking flanges are provided on all four exhaust ports for docking with an external exhaust air pipeline to discharge the hot air in the test engine casing section.

[0025] A circle of evenly distributed air inlet holes 607 is provided at a position on the same horizontal plane as the middle layer 603 for the four air inlets, namely the lower air intake section air inlet one 201, the lower air intake section air inlet two 202, the lower air intake section air inlet three 203, and the lower air intake section air inlet four 204.

[0026] A circle of evenly distributed exhaust holes 613 is provided at a position on the same horizontal plane as the outer layer 604 for the four exhaust ports, namely the upper exhaust section exhaust port one 401, the upper exhaust section exhaust port two 402, the upper exhaust section exhaust port three 403, and the upper exhaust section exhaust port four 404.

[0027] The total area of the jet impact holes 605 is not greater than the sum of the cross-sectional areas of the pipelines of the four air inlets, namely the lower air intake section air inlet one 201, the lower air intake section air inlet two 202, the lower air intake section air inlet three 203, and the lower air intake section air inlet four 204.

[0028] It should be noted that: The pressure-bearing layer 601 is the innermost layer of the jet impact inner sleeve 600 and is composed of a complete cylinder for bearing the gas pressure inside the heating chamber; the flow guide column 608 is arranged between the middle layer 603 and the outer layer 604, and both ends of the flow guide column 608 are welded to the middle layer 603 and the outer layer 604 respectively. The flow guide column 608 has a hollow structure and communicates the air inlet chamber 610 and the jet impact chamber 612; the outer layer 604 is provided with jet impact holes 605 and return holes 606, and the return hole 606 communicates the return chamber 609 and the jet impact chamber 612.

[0029] The working process of the casing jet impact enhanced heat transfer device of the present invention is as follows: Before the test starts, it is necessary to connect the hot air pipeline to the first lower intake port 201, the second lower intake port 202, the third lower intake port 203, and the fourth lower intake port 204; connect the exhaust pipeline to the first upper exhaust port 401, the second upper exhaust port 402, the third upper exhaust port 403, and the fourth upper exhaust port 404. The hot air is introduced into the interior of the test casing section through the lower intake section 200. The hot air enters the air inlet chamber 610 through the air inlet hole 607, and then the hot air enters the jet impact chamber 612 through the hollow flow guide column 608 and the jet impact holes 605 to perform jet impact enhanced heating on the test casing section 300. Since the total area of the jet impact holes 605 is not greater than the sum of the cross-sectional areas of the four intake pipelines of the first lower intake port 201, the second lower intake port 202, the third lower intake port 203, and the fourth lower intake port 204, the hot air flowing through the jet impact holes 605 is accelerated, further improving the jet impact enhanced heat transfer 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, ensuring that the test casing section 300 is uniformly heated. The hot air enters the jet impact chamber 612, is dispersed and rebounded by the inner surface of the test casing section 300. After completing the jet impact heat transfer, it flows into the return chamber 609 through the return holes 606 provided on the outer layer 604 and flows out from the exhaust holes 613 provided on the outer layer 604; finally, it flows into the exhaust pipeline through the four exhaust ports of the first upper exhaust port 401, the second upper exhaust port 402, the third upper exhaust port 403, and the fourth upper exhaust port 404 provided on the upper exhaust section 400. The intake pipeline continuously supplies hot air, and the hot air will continuously heat the test casing section 300 through the above process, continuously increasing the overall temperature of the test casing section 300, and finally completing the uniform heating of the test casing section 300.

[0030] After the test, replace the hot air with cold air. The cold air can achieve rapid cooling of the test casing section 300 through the above process.

[0031] By controlling the temperature of the air in the intake pipe, the heating temperature control of the test machine casing section 300 can be completed, so as to realize the alternating cycle test conditions of high temperature and low temperature heating of the test machine casing section 300.

[0032] Heat the test machine casing. After heating to the required temperature, as Figure 8 shown, the temperatures at the upper and lower ends of the test machine casing section 300 are evenly transitioned. Among them, the temperature at the upper end of the casing is between 335 °C and 347.5 °C, and the temperature at the lower end of the casing is between 351.5 °C and 360.5 °C. The temperature difference of the test machine casing section 300 is within the required range, indicating that the jet impingement enhanced heat transfer device using this casing heating has achieved uniform heating of the test machine casing section and reduced the circumferential and axial temperature differences of the test machine casing section.

Claims

1. A jet impingement enhanced heat transfer device for casing heating, characterized in that It includes a lower rotation stage (100), a lower air intake section (200), a test engine casing section (300), an upper exhaust section (400) and an upper rotation stage (500). The test engine casing section (300) is arranged between the upper exhaust section (400) and the lower air intake section (200). The upper part of the upper exhaust section (400) is connected to the upper rotation stage (500), and the lower part of the lower air intake section (200) is connected to the lower rotation stage (100). On the inner wall between the lower rotation stage (100) and the upper rotation stage (500), a jet impingement inner sleeve (600) is also installed. The jet impingement inner sleeve (600) includes a pressure-bearing layer (601), an inner layer (602), a middle layer (603), an outer layer (604) and a flow guide column (608). The pressure-bearing layer (601) is arranged inside the inner layer (602), and the flow guide column (608) is arranged between the middle layer (603) and the outer layer (604), and four cavities are formed, namely a return 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 impingement cavity (612) formed between the outer layer (604) and the test engine casing section (300). Jet impingement holes (605) and return holes (606) are also arranged on the outer layer (604).

2. The jet impingement enhanced heat transfer device for casing heating according to claim 1, characterized in that Bolts are used for connection between the lower rotation stage (100) and the lower air intake section (200), between the lower air intake section (200) and the test engine casing section (300), between the test engine casing section (300) and the upper exhaust section (400), and between the upper exhaust section (400) and the upper rotation stage (500), and sealing washers (702) are arranged between adjacent connection surfaces.

3. The jet impingement enhanced heat transfer device for casing heating according to claim 1, wherein, Shaft seals (701) are also arranged 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).

4. A jet impingement enhanced heat transfer device for casing heating according to claim 2, characterized in that, Four air inlets, namely a lower air intake section air inlet one (201), a lower air intake section air inlet two (202), a lower air intake section air inlet three (203) and a lower air intake section air inlet four (204), are arranged on the lower air intake section (200), and docking flanges are arranged on the four air inlets for docking with an external hot air intake pipeline to introduce hot air into the test engine casing section.

5. The jet impingement enhanced heat transfer device for casing heating according to claim 2, wherein Four exhaust ports, namely an upper exhaust section exhaust port one (401), an upper exhaust section exhaust port two (402), an upper exhaust section exhaust port three (403) and an upper exhaust section exhaust port four (404), are arranged on the upper exhaust section (400), and docking flanges are arranged on the four exhaust ports for docking with an external exhaust air pipeline to discharge the hot air in the test engine casing section.

6. The jet impingement enhanced heat transfer device for casing heating according to claim 4, characterized in that A circle of evenly distributed air intake holes (607) is arranged at positions of the four air inlets, namely the lower air intake section air inlet one (201), the lower air intake section air inlet two (202), the lower air intake section air inlet three (203) and the lower air intake section air inlet four (204), which are at the same horizontal plane as the middle layer (603).

7. A jet impingement enhanced heat transfer device for casing heating according to claim 5, characterized in that, An exhaust hole (613) evenly distributed in a circle is arranged at a position where the four exhaust ports, namely the upper exhaust section exhaust port one (401), the upper exhaust section exhaust port two (402), the upper exhaust section exhaust port three (403), and the upper exhaust section exhaust port four (404), are on the same horizontal plane as the outer layer (604).

8. A jet impingement enhanced heat transfer device for casing heating according to claim 6, characterized in that, The total area of the jet impact holes (605) is not greater than the sum of the cross-sectional areas of the four intake ports of the lower intake section, namely the lower intake section intake port one (201), the lower intake section intake port two (202), the lower intake section intake port three (203), and the lower intake section intake port four (204).

9. The jet impingement enhanced heat transfer device for casing heating according to claim 1, wherein Both ends of the flow guiding column (608) are respectively welded to the middle layer (603) and the outer layer (604). The flow guiding column (608) has a hollow structure and communicates the intake cavity (610) and the jet impact cavity (612).

10. A jet impingement enhanced heat transfer device for casing heating according to claim 1, characterized in that, The return hole (606) communicates the return cavity (609) and the jet impact cavity (612).

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