High-enthalpy pure air heating device

Abstract

The utility model provides a high-enthalpy pure air heating device which is used for solving the technical problem that according to an existing heating mode, the attributes of incoming flow air and real air are different. The heating device comprises a gas inlet unit, a heating unit and a gas collecting unit, the air inlet unit is connected with the heating unit; the heating unit comprises a shell, and a heat transfer chamber and a combustion chamber which are arranged in the shell; the heat transfer chamber is coaxially installed in the shell, the radial section of the heat transfer chamber is of a circular ring structure, and the combustion chamber is axially installed in the center of the circular ring structure. A plurality of radial channels and axial channels which are mutually independent are arranged in the heat transfer chamber; the two ends of each radial channel communicate with the combustion chamber and the residual gas outlet correspondingly, and the radial channels are used for conveying high-temperature gas. The two ends of each axial channel communicate with the air inlet and the air outlet correspondingly, and the axial channels are used for conveying incoming flow air. And the gas collection unit is used for collecting the high-enthalpy air and transmitting the high-enthalpy air to external test equipment. The device is high in heating speed, and pure high-enthalpy air can be obtained.

Description

Technical Field

[0001] The utility model relates to an air heating device, in particular to a high-enthalpy pure air heating device. Background Art

[0002] With the development of modern industry and scientific research, the requirements for air heating technology in some specialized fields are becoming increasingly stringent. For example, when performing performance tests or experiments on devices such as aircraft and rocket engines, due to the extreme environments such as high temperature and high pressure, the incoming air must be rapidly heated to meet the process requirements in order to obtain the high enthalpy incoming air required for the test.

[0003] Existing technologies typically use a method of directly injecting fuel into the incoming air for combustion heating to produce high-enthalpy incoming air that matches flight conditions. However, while this method can increase the incoming air temperature, it also inevitably introduces combustion products into the air during combustion heating, contaminating it. This results in significant differences in the properties of the incoming air used for testing and actual air, leading to significant deviations between test results and actual results. Utility Model Content

[0004] In order to solve the technical problem that the existing heating method has a large deviation between the test results and the actual situation due to the difference in properties between the incoming air and the real air, the utility model provides a high enthalpy pure air heating device.

[0005] In order to achieve the above objectives, the technical solutions provided by this utility model are:

[0006] A high enthalpy pure air heating device is characterized in that it comprises an air intake unit, a heating unit and an air collecting unit;

[0007] The air intake unit is connected to the heating unit and is used to transport the incoming air into the heating unit;

[0008] The heating unit includes a shell and a heat transfer chamber and a combustion chamber arranged in the shell; the shell is a hollow cylindrical structure, one axial end of which is provided with an air inlet connected to the air inlet unit, and the other end is provided with an air outlet connected to the air collection unit; the radial direction of the shell is provided with multiple gas residual gas outlets for connecting to an external residual gas pipeline;

[0009] The heat transfer chamber is coaxially mounted inside the shell, and its radial cross-section is a circular ring structure. The combustion chamber is axially mounted at the center of the circular ring structure and is used to generate high-temperature combustion gas. A plurality of independent radial and axial channels are provided inside the heat transfer chamber. The two ends of each radial channel are respectively connected to the combustion chamber and the residual gas outlet for conveying high-temperature combustion gas. The two ends of each axial channel are respectively connected to the air inlet and the air outlet. Incoming air enters the axial channel through the air inlet, exchanges heat with the high-temperature combustion gas conveyed by the radial channel, and forms high-enthalpy air, which then enters the gas collection unit through the air outlet.

[0010] The air collecting unit is installed at one end of the shell where the air outlet is provided, and is used to collect high enthalpy air and transmit it to external test equipment.

[0011] Furthermore, the air intake unit includes an air intake main pipe and a plurality of branch pipes;

[0012] The air intake main pipe is a cylindrical structure with one end open and the other end closed, wherein the open end is used for the entry of incoming air; multiple branch pipes are evenly distributed around the circumference of the air intake main pipe for transmitting the incoming air; one end of the branch pipe is connected to the side wall of the air intake main pipe near the closed end, and the other end is connected to the air inlet of the shell; the air inlet is a plurality of air inlets corresponding to the multiple branch pipes.

[0013] Furthermore, a flow guide is provided in the air intake main pipe; the flow guide is a conical structure, with its top facing the open end of the air intake main pipe and its bottom surface installed on the inner end surface of the closed end of the air intake main pipe.

[0014] Furthermore, an ignition device and a water-cooled blind plate are respectively installed at both axial ends of the combustion chamber; the ignition device is located at one end of the combustion chamber close to the air inlet of the shell, and an oxidant inlet and a fuel inlet are respectively provided in the radial direction at the end of the combustion chamber close to the ignition device, and the ignition device is used to make the oxidant and fuel burn in the combustion chamber and generate high-temperature combustion gas; a plurality of combustion holes connected to the radial channel are provided on the radial side wall of the combustion chamber; the water-cooled blind plate is used to seal the combustion chamber.

[0015] Furthermore, an annular rectifying plate is installed at one end of the heat transfer chamber close to the air inlet, and an annular groove with an opening toward the air inlet is provided on the annular rectifying plate, and a plurality of vent holes communicating with the axial channel are provided at the bottom of the annular groove.

[0016] Furthermore, the combustion chamber and the heat transfer chamber are an integrated structure.

[0017] Furthermore, the gas collecting unit is a cylindrical structure with small ends and a large middle.

[0018] Furthermore, the radial channel and the axial channel are circular channels or rectangular channels.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention comprises an air intake unit, a heating unit, and an air collection unit. The heating unit comprises a housing, a heat transfer chamber, and a combustion chamber disposed therein. The heat transfer chamber is provided with a plurality of independent radial and axial channels. Each radial channel is used to convey high-temperature combustion gas, and each axial channel is used to convey incoming air. Therefore, the incoming air and the high-temperature combustion gas exchange heat without direct contact, thereby generating high-enthalpy air, thereby ensuring the purity of the high-enthalpy air required for the test.

[0021] 2. The air intake unit of the present invention includes an air intake main pipe and multiple branch pipes. One end of each branch pipe is connected to the air intake main pipe, and the other end is connected to the air inlet, so that the incoming air enters the heat transfer chamber evenly, ensuring the uniformity of the incoming air heating.

[0022] 3. The utility model provides a flow guide in the air inlet main pipe, so that the incoming air can evenly enter each branch pipe before entering the heat transfer chamber, thereby ensuring that it is evenly distributed to each axial channel of the heat transfer chamber.

[0023] 4. The utility model provides an annular rectifying plate near the air inlet in the heat transfer chamber to avoid accumulation of incoming air when it enters the axial channel.

[0024] 5. The utility model has the characteristics of fast heating speed, wide temperature adjustment range, good temperature stability and high thermal efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of an embodiment of the present utility model.

[0026] Figure 2 Schematic diagram of the structure of the heat transfer chamber in the embodiment of the present utility model.

[0027] Figure 3 It is a structural schematic diagram of the combustion chamber in an embodiment of the present utility model.

[0028] Figure 4 Schematic diagram of the structure of the flow guide member in the embodiment of the present utility model.

[0029] Figure 5 Schematic diagram of the connection structure between the heat transfer chamber and the annular rectifying plate in an embodiment of the present utility model.

[0030] The following are the descriptions of the reference numerals:

[0031] 1-air intake unit, 11-air intake main pipe, 12-branch pipe, 2-heating unit, 21-shell, 211-gas residual gas outlet, 22-heat transfer chamber, 221-radial channel, 222-axial channel, 23-combustion chamber, 231-oxidant inlet, 232-fuel inlet, 24-ignition device, 25-water-cooled blind plate, 3-gas collecting unit, 4-flow guide, 5-annular rectifying plate, 51-annular groove, 52-vent. DETAILED DESCRIPTION

[0032] In order to make the purpose, advantages and features of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] like Figure 1 As shown, this embodiment provides a high enthalpy pure air heating device, comprising an air intake unit 1, a heating unit 2 and an air collecting unit 3. The air intake unit 1 is connected to the heating unit 2 for conveying incoming air into the heating unit 2.

[0034] Combine Figure 1 、 Figure 2 、 Figure 3 As shown, the heating unit 2 includes a housing 21, a heat transfer chamber 22, and a combustion chamber 23 disposed within the housing 21. The housing 21 is a hollow cylindrical structure, with an air inlet at one axial end connected to the air inlet unit 1 and an air outlet at the other end connected to the air collection unit 3. The housing 21 is radially provided with multiple residual gas outlets 211 for connection to external residual gas pipelines.

[0035] The heat transfer chamber 22 is coaxially installed inside the shell 21, and its radial cross section is a circular ring structure. The combustion chamber 23 is axially installed at the center of the circular ring structure for generating high-temperature combustion gas.

[0036] like Figure 3 As shown, an ignition device 24 and a water-cooled blind plate 25 are mounted on each axial end of the combustion chamber 23. The ignition device 24 is located at the end of the combustion chamber 23 near the air inlet of the housing 21. An oxidant inlet 231 and a fuel inlet 232 are radially disposed at the end of the combustion chamber 23 near the ignition device 24. The ignition device 24 is used to mix, atomize, and combust the oxidant and fuel within the combustion chamber 23, generating high-temperature combustion gas. The radial sidewalls of the combustion chamber 23 are provided with multiple combustion holes that communicate with the radial passages 221. The water-cooled blind plate 25 is used to seal the combustion chamber 23. In this embodiment, the combustion chamber 23 and the heat transfer chamber 22 are designed as an integrated structure.

[0037] like Figure 2 As shown, a plurality of mutually independent radial channels 221 and axial channels 222 are provided inside the heat transfer chamber 22; the radial channels 221 and the axial channels 222 can be circular channels or rectangular channels, and can also be designed into corresponding structures as needed.

[0038] Each radial channel 221 is connected at both ends to the combustion chamber 23 and the residual gas outlet 211, respectively, for conveying high-temperature gas. Each axial channel 222 is connected at both ends to the air inlet and outlet, respectively. Incoming air enters the axial channel 222 through the air inlet, exchanges heat with the high-temperature gas conveyed by the radial channel 221, and forms high-enthalpy air, which then enters the gas collection unit 3 through the outlet.

[0039] The air collecting unit 3 is installed at one end of the shell 21 where the air outlet is provided. It can be cylindrical or a cylindrical structure with small ends and a large middle. It is used to collect high-enthalpy air and mix the high-enthalpy air evenly, and then transmit the high-enthalpy air to external test equipment.

[0040] like Figure 1 As shown, the air intake unit 1 of this embodiment includes an air intake main pipe 11 and multiple branch pipes 12. The air intake main pipe 11 is a cylindrical structure with one end open and the other closed. Incoming air enters the air intake main pipe 11 through the open end. Multiple branch pipes 12 are evenly distributed around the circumference of the air intake main pipe 11. One end of each branch pipe 12 is connected to the side wall of the air intake main pipe 11 near the closed end, and the other end is connected to the air inlet of the housing 21. The multiple branch pipes 12 evenly distribute the incoming air into the air intake main pipe 11 and transmit it through the air inlet to the axial channel 222 of the heat transfer chamber 22.

[0041] Preferably, if Figure 4 As shown, in this embodiment, a guide member 4 is provided in the air intake main pipe 11. The guide member 4 has a conical structure, with its top facing the open end of the air intake main pipe 11 and its bottom surface installed on the inner end surface of the closed end of the air intake main pipe 11, so as to ensure that the incoming air can be evenly distributed to each branch pipe 12.

[0042] The air inlet of this embodiment may be one air inlet, or may be a plurality of air inlets corresponding one-to-one to the plurality of branch pipes 12 .

[0043] like Figure 5 As shown, to ensure that incoming air enters the heat transfer chamber 22 evenly, an annular rectifying plate 5 is installed at one end of the heat transfer chamber 22 near the air inlet. The annular rectifying plate 5 is provided with an annular groove 51 with an opening toward the air inlet. The bottom of the annular groove 51 is provided with multiple air vents 52 connected to the axial channel 222. The incoming air passes through the air inlet main pipe 11 and branch pipe 12, then reaches the annular groove 51 through the air inlet, and is evenly distributed through the air vents 52 before entering the axial channel 222 of the heat transfer chamber 22.

[0044] This embodiment utilizes a unique structural design, in which heat transfer chamber 22 efficiently and evenly transfers heat from the high-temperature combustion gas to the incoming air through a highly efficient, porous wall-type heat transfer method. Compared to traditional heating devices, this device offers lower energy consumption, independence from electrical system power, faster heating speeds, lower maintenance costs, and a wider range of applications.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the present invention.

Claims

1. A high enthalpy pure air heating device, characterized in that: It comprises an air intake unit (1), a heating unit (2) and an air collection unit (3); The air intake unit (1) is connected to the heating unit (2) and is used to convey incoming air into the heating unit (2); The heating unit (2) comprises a shell (21) and a heat transfer chamber (22) and a combustion chamber (23) arranged in the shell (21); the shell (21) is a hollow cylindrical structure, one axial end of which is provided with an air inlet connected to the air inlet unit (1), and the other end of which is provided with an air outlet connected to the air collecting unit (3); the shell (21) is provided with a plurality of residual gas outlets (211) in the radial direction for connecting to an external residual gas pipeline; The heat transfer chamber (22) is coaxially mounted inside the shell (21), and its radial cross-section is an annular structure. The combustion chamber (23) is axially mounted at the center of the annular structure and is used to generate high-temperature combustion gas. A plurality of mutually independent radial channels (221) and axial channels (222) are provided inside the heat transfer chamber (22). The two ends of each radial channel (221) are respectively connected to the combustion chamber (23) and the residual gas outlet (211) for conveying high-temperature combustion gas. The two ends of each axial channel (222) are respectively connected to the air inlet and the air outlet. The incoming air enters the axial channel (222) through the air inlet, exchanges heat with the high-temperature combustion gas conveyed by the radial channel (221), and forms high-enthalpy air, which then enters the gas collecting unit (3) through the air outlet. The air collecting unit (3) is installed at one end of the housing (21) provided with an air outlet, and is used to collect high-enthalpy air and transmit it to external test equipment.

2. The high enthalpy pure air heating device according to claim 1, characterized in that: The air intake unit (1) comprises an air intake main pipe (11) and a plurality of branch pipes (12); The air intake main pipe (11) is a cylindrical structure with one end open and the other end closed, wherein the open end is used for the entry of incoming air; a plurality of branch pipes (12) are uniformly distributed in the circumference of the air intake main pipe (11) for the transmission of incoming air; one end of the branch pipe (12) is connected to the side wall of the air intake main pipe (11) close to the closed end, and the other end is connected to the air inlet of the shell (21); the air inlet is a plurality of air inlets corresponding to the plurality of branch pipes (12).

3. The high enthalpy pure air heating device according to claim 2, characterized in that: A flow guide (4) is provided in the air intake main pipe (11); The flow guide (4) is a conical structure, with its top end facing the open end of the air intake main pipe (11) and its bottom surface mounted on the inner end surface of the closed end of the air intake main pipe (11).

4. The high enthalpy pure air heating device according to claim 1, 2 or 3, characterized in that: An ignition device (24) and a water-cooled blind plate (25) are respectively installed at both axial ends of the combustion chamber (23); the ignition device (24) is located at one end of the combustion chamber (23) close to the air inlet of the shell (21); an oxidant inlet (231) and a fuel inlet (232) are respectively provided in the radial direction at one end of the combustion chamber (23) close to the ignition device (24); the ignition device (24) is used to make the oxidant and the fuel burn in the combustion chamber (23) and generate high-temperature combustion gas; a plurality of combustion holes connected to the radial channel (221) are provided on the radial side wall of the combustion chamber (23); The water-cooled blind plate (25) is used to seal the combustion chamber (23).

5. The high enthalpy pure air heating device according to claim 4, characterized in that: An annular rectifying plate (5) is installed at one end of the heat transfer chamber (22) close to the air inlet. The annular rectifying plate (5) is provided with an annular groove (51) opening toward the air inlet. The bottom of the annular groove (51) is provided with a plurality of vent holes (52) communicating with the axial channel (222).

6. The high enthalpy pure air heating device according to claim 1, characterized in that: The combustion chamber (23) and the heat transfer chamber (22) are an integrated structure.

7. The high enthalpy pure air heating device according to claim 6, characterized in that: The gas collecting unit (3) is a cylindrical structure with small ends and a large middle.

8. The high enthalpy pure air heating device according to claim 7, characterized in that: The radial channel (221) and the axial channel (222) are circular channels or rectangular channels.

Images