A cold and hot airflow mixing device based on a tesla-like valve

Abstract

The present application belongs to the technical fields of gas mixing, and discloses a cold and hot gas flow mixing device based on a Tesla-like valve, which comprises a base, a ceramic cavity arranged in the base, and a quartz glass cover plate. The ceramic cavity is provided with a hot gas inlet, a cold gas inlet, a Tesla-like valve flow channel, and a mixed gas outlet which are connected in sequence. The quartz glass cover plate is arranged on the base. The Tesla-like valve flow channel comprises a plurality of Tesla-like valve units which are connected in sequence. Each Tesla-like valve unit comprises a main flow channel, a middle straight flow channel, a first arc-shaped flow channel, and a second arc-shaped flow channel. The first arc-shaped flow channel and the second arc-shaped flow channel are symmetrically arranged about the middle straight flow channel. One end of the first arc-shaped flow channel, one end of the second arc-shaped flow channel, and one end of the middle straight flow channel are connected to one end of the main flow channel. The other end of the second arc-shaped flow channel and the other end of the first arc-shaped flow channel are connected to the other end of the middle straight flow channel. The present application improves the mixing efficiency and uniformity.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field related to gas mixing, and more particularly to a cold and hot airflow mixing device based on a Tesla-like valve. BACKGROUND

[0002] In the development process of space vehicles, in order to shorten the development cycle and reduce the cost, it is usually necessary to carry out semi-physical simulation of the total temperature signal of the space vehicle.

[0003] The cold and hot airflow mixing device can obtain a total temperature signal with fast response, large change gradient and stable duration, but it faces the design difficulty of fully mixing the cold and hot airflow in a small space in a short time, and the rapidity, fullness and uniformity of the mixing of the cold and hot airflow directly affect the accuracy, change gradient and response speed of the total temperature signal, so there is an urgent need in the field to design a device capable of rapidly, fully and uniformly mixing high-temperature airflow to meet the urgent needs of the total temperature signal in semi-physical simulation.

[0004] The Tesla valve is a one-way valve, which skillfully utilizes the characteristics that the fluid in the opposite direction will preferentially pass through the annular flow channel due to inertia and collide with the branch straight flow channel, realizes a large reverse flow resistance to realize one-way conduction, and the collision of the fluid generates vortexes to accelerate the mixing between the fluids, but the flow channel of the Tesla valve has obvious flow directionality, which is not conducive to uniform airflow mixing. SUMMARY

[0005] In view of the above defects or improvement needs of the prior art, the application provides a cold and hot airflow mixing device based on a Tesla-like valve, which can be applied to high-temperature airflow mixing conditions, has small heat loss, small volume, reliable installation, and the characteristics of rapid and uniform mixing, flow visualization and no need for a power source.

[0006] To achieve the above-mentioned purpose, according to one aspect of the application, a cold and hot airflow mixing device based on a Tesla-like valve is provided, the mixing device comprising a base, a ceramic cavity and a quartz glass cover plate arranged in the base, the ceramic cavity being provided with a hot gas inlet, a cold gas inlet, a Tesla-like valve flow channel and a mixed gas outlet in communication, the quartz glass cover plate covering the hot gas inlet, the cold gas inlet, the Tesla-like valve flow channel and the mixed gas outlet; the ceramic cavity is T-shaped, the hot gas inlet, the cold gas inlet and the mixed gas outlet are respectively located at the three end portions of the ceramic cavity; the center axes of the hot gas inlet and the cold gas inlet coincide and are perpendicular to the length direction of the ceramic cavity, and the center axis of the mixed gas outlet is arranged along the length direction of the ceramic cavity;

[0007] The class Tesla valve flow channel communicates the hot gas inlet, the cold gas inlet and the mixed gas outlet, which includes a plurality of class Tesla valve units connected in sequence, the class Tesla valve unit includes a main flow channel, a middle straight flow channel, a first arc-shaped flow channel and a second arc-shaped flow channel, the first arc-shaped flow channel and the second arc-shaped flow channel are symmetrically arranged about the middle straight flow channel; the center axis of the middle straight flow channel coincides with the center axis of the middle straight flow channel and is arranged along the length direction of the ceramic cavity; one end of the first arc-shaped flow channel, one end of the second arc-shaped flow channel and one end of the middle straight flow channel are all connected with one end of the main flow channel, the other end of the second arc-shaped flow channel and the other end of the first arc-shaped flow channel are respectively connected with the other end of the middle straight flow channel.

[0008] Further, the flow area of the main flow channel, the flow area of the mixed gas outlet and the sum of the flow area of the middle straight flow channel, the flow area of the first arc-shaped flow channel and the flow area of the second arc-shaped flow channel are equal.

[0009] Further, the flow area of the first arc-shaped flow channel is the same as the flow area of the second arc-shaped flow channel, and the flow area of the middle straight flow channel is smaller than the flow area of the first arc-shaped flow channel.

[0010] Further, the ceramic cavity and the quartz glass cover plate form a mixed cavity, the mixing device further includes a glass cover plate, the glass cover plate is arranged on the base to encapsulate the mixed cavity in the base; the base and the glass cover plate constitute an outer frame, and the outer frame and the mixed cavity are filled with a closed gas.

[0011] Further, the base is provided with a receiving groove for receiving the mixed cavity; opposite inner groove walls of the receiving groove are respectively provided with a first groove, a second groove and a third groove, the center axes of the first groove and the second groove coincide and are perpendicular to the length direction of the base, and the center axis of the third groove is arranged along the length direction of the base; the bottom surfaces of the first groove, the second groove and the third groove are respectively provided with a first mounting groove, a second mounting groove and a third mounting groove, and the first mounting groove, the second mounting groove and the third mounting groove respectively penetrate the groove wall of the receiving groove.

[0012] Further, the mixing device further includes three heat insulation plates, three heat insulation plates are respectively arranged in the first groove, the second groove and the third groove; the heat insulation plate is rectangular and is provided with a receiving hole; three ends of the ceramic cavity are arranged in the first mounting groove, the second mounting groove and the third mounting groove after penetrating through the receiving holes of the three heat insulation plates.

[0013] Further, the shape and size of the quartz glass plate correspond to the shape and size of the surface on which the main flow channel of the ceramic cavity is located.

[0014] Further, the heat insulation plate is a mica plate.

[0015] Further, the material of the glass cover plate is a transparent glass material.

[0016] Further, the glass cover plate and the base are connected by bolts to complete the packaging of the mixing device, and the enclosed gas between the base and the ceramic cavity has a heat insulation effect.

[0017] Overall, compared with the prior art, the cold and hot airflow mixing device based on the Tesla-like valve provided by the present application mainly has the following beneficial effects:

[0018] 1. The mixing device provided by the present application makes the mixed airflow collide with each other multiple times to form a large number of vortexes, so that a mixed and uniform total temperature airflow is obtained at the outlet, and the mixing device does not require an external power source, can quickly obtain an outlet total temperature signal with small flow rate airflow in a small flow area flow channel, and has the advantages of low gas consumption and low energy consumption.

[0019] 2. The mixing flow channel of the mixing device is based on a Tesla valve, and the Tesla-like valve units are symmetrically arranged, which solves the problem that the flow directionality of the Tesla valve is not conducive to uniform mixing, and the Tesla-like valve units have the advantage of smaller volume compared with the classic Tesla valve flow channel units.

[0020] 3. The mixing cavity has a small volume, and the heat loss of the mixed airflow is small due to the arrangement of heat insulation materials between the mixing cavity and the outer frame, so that the temperature of the outer frame is low and insulated, and the installation is reliable.

[0021] 4. The cover plates of the mixing cavity and the outer frame are made of transparent materials, so that the mixing and flowing process of the mixed airflow is visualized, the flow of the fluid in the Tesla-like valve ceramic cavity is observed, and the mixing cavity is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structure schematic diagram of the cold and hot airflow mixing device based on the Tesla-like valve provided by the present application after removing the glass cover plate and the quartz glass plate;

[0023] Figure 2 is Figure 1 a plane schematic diagram of the cold and hot airflow mixing device based on the Tesla-like valve in

[0024] Figure 3 is Figure 2 a sectional view of the cold and hot airflow mixing device based on the Tesla-like valve in

[0025] Figure 4 is Figure 2 is a sectional view of a cold-hot air flow mixing device based on a Tesla valve type along the direction of B-B in

[0026] In all the drawings, the same reference signs are used to denote the same elements or structures, wherein: 1 - base, 2 - glass cover plate, 3 - ceramic cavity, 4 - quartz glass plate, 5 - heat insulation plate. DETAILED DESCRIPTION

[0027] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely used to explain the present application and should not be used to limit the present application. In addition, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0028] The present application provides a cold-hot air flow mixing device based on a Tesla valve type, which can be used in high-temperature air flow mixing conditions below 1500k, has the characteristics of safety and reliability, sufficient and uniform mixing, small heat loss, no need for power source, and flow visualization.

[0029] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 , the mixing device comprises a base, a glass cover plate, a ceramic cavity, a quartz glass plate and a heat insulation plate. The glass cover plate is arranged on the base to form an outer frame. The ceramic cavity is arranged in the base, and the quartz glass plate is arranged on the ceramic cavity to form a mixing cavity. The mixing cavity and the outer frame are filled with closed air, and the heat insulation of the mixing cavity can be realized by using the low thermal conductivity of air. The heat insulation plate is arranged on the base and is located between the ceramic cavity and the base.

[0030] The base is rectangular and has a receiving groove. Opposite two inner groove walls of the receiving groove are respectively provided with a first groove and a second groove, and the remaining one inner groove wall is provided with a third groove. The center axes of the first groove and the second groove coincide and are perpendicular to the length direction of the base, and the center axis of the third groove is arranged along the length direction of the base. The bottom surface of the first groove, the bottom surface of the second groove and the bottom surface of the third groove are respectively provided with a first mounting groove, a second mounting groove and a third mounting groove, and the first mounting groove, the second mounting groove and the third mounting groove respectively penetrate the groove wall of the receiving groove.

[0031] The heat insulation plate is rectangular and has a receiving hole.

[0032] The ceramic cavity is T-shaped and has a hot gas inlet, a cold gas inlet, a Tesla-like valve flow channel and a mixed gas outlet connected in series. The hot gas inlet and the cold gas inlet are located at one end of the ceramic cavity, and the mixed gas outlet is located at the other end of the ceramic cavity. The central axes of the hot gas inlet and the cold gas inlet coincide and are perpendicular to the length direction of the ceramic cavity. The central axis of the mixed gas outlet is arranged along the length direction of the ceramic cavity. The Tesla-like valve flow channel connects the hot gas inlet, the cold gas inlet and the mixed gas outlet. The hot gas inlet, the cold gas inlet, the Tesla-like valve flow channel and the mixed gas outlet form the mixing cavity.

[0033] The Tesla-like valve flow channel includes a plurality of Tesla-like valve units connected in series. The Tesla-like valve unit includes a main flow channel, a middle straight flow channel, a first arc-shaped flow channel and a second arc-shaped flow channel. The first arc-shaped flow channel and the second arc-shaped flow channel are symmetrically arranged about the middle straight flow channel. The central axis of the middle straight flow channel coincides with the central axis of the middle straight flow channel and is arranged along the length direction of the ceramic cavity. One end of the first arc-shaped flow channel, one end of the second arc-shaped flow channel and one end of the middle straight flow channel are connected to one end of the main flow channel, and the other end of the second arc-shaped flow channel and the other end of the first arc-shaped flow channel are connected to the other end of the middle straight flow channel. In this way, the mixed gas flow enters the mixing cavity through the hot gas inlet and the cold gas inlet, collides and mixes, enters the Tesla-like valve flow channel, the Tesla-like valve unit is bifurcated from a single inlet into a small cross-section straight flow channel and two symmetric annular flow channels, and the mixed gas flow flows in three ways after entering, the upper and lower paths converge and collide after passing through the symmetric annular flow channel, and then the mixed gas flow flows out in a straight line direction and enters the next Tesla-like valve unit. The mixed gas flow repeatedly collides and impacts in the mixed flow channel of the Tesla-like valve, and the mixing device finally realizes full mixing of the cold and hot gas flows and obtains mixed gas with uniform temperature distribution at the outlet.

[0034] The cross-sectional area of the main flow channel, the cross-sectional area of the first arc-shaped flow channel and the cross-sectional area of the middle straight flow channel can be designed according to a ratio of 8:3:2, and the total cross-sectional area after the bifurcation of the three paths is unchanged to prevent redundant pressure resistance. The cross-sectional area of the middle straight flow channel is smaller than the cross-sectional area of the first arc-shaped flow channel to make the flow rates of the three paths substantially the same. Preferably, the flow area of the inlet of the Tesla-like valve unit, the flow area of the outlet of the Tesla-like valve unit and the sum of the flow area of the middle straight flow channel, the flow area of the first arc-shaped flow channel and the flow area of the second arc-shaped flow channel are substantially the same. The flow area of the first arc-shaped flow channel is the same as the flow area of the second arc-shaped flow channel. The flow area of the middle straight flow channel is smaller than the flow area of the first arc-shaped flow channel.

[0035] The three ends of the ceramic cavity are arranged in the first mounting groove, the second mounting groove and the third mounting groove after passing through the accommodation holes of the three heat insulation plates. The shape and size of the quartz glass plate correspond to the shape and size of one surface of the ceramic cavity, and the quartz glass plate is arranged on the ceramic cavity to cover the mixing cavity.

[0036] In the embodiment, the material of the heat insulation plate is a low-thermal-conductivity and high-temperature-resistant insulating material such as a mica plate. The material of the quartz glass plate is quartz glass material. The material of the glass cover plate is ordinary transparent glass material, so that the flow of mixed gas can be visualized. The ceramic cavity is formed by casting high-temperature-resistant alumina ceramic. The base can be made of a lightweight material such as aluminum alloy, which is easy to process and is convenient for connection with external devices such as a plasma torch and a thermocouple. The glass cover plate and the base are connected by bolts to complete the packaging of the mixing device. The enclosed gas between the base and the ceramic cavity has a heat insulation effect.

[0037] The air compressor output gas pipe is connected with the cold gas inlet, and the plasma torch of ionizable argon gas is connected with the hot gas inlet. The cold and hot gas flows are incident at a fixed small flow rate in opposite directions and are emitted along the middle straight line direction after passing through all the Tesla-like valve units.

[0038] The cold and hot gas flows collide and preliminarily mix in the incident cavity. The Tesla-like valve unit is formed by mirroring the annular flow channel of the Tesla valve unit along the straight flow channel. The unit has a single inlet and a single outlet. The inlet is bifurcated into an upper annular flow channel, a middle straight flow channel and a lower annular flow channel. The ends of the two annular flow channels converge with the middle straight flow channel. The outlet of the Tesla-like valve unit is along the direction of the middle straight flow channel.

[0039] The flow areas of the inlet and the outlet of the Tesla-like valve unit should be substantially the same as the sum of the flow areas of the three flow channels to prevent redundant pressure resistance. The flow areas of the two annular flow channels should be equal to ensure the symmetry of the flow. The flow area of the middle straight flow channel should be smaller than the flow area of the annular flow channel to make the flow rates in the three flow channels substantially the same and to ensure the large impact strength at the convergence of the three parts.

[0040] By setting the heat insulation plate, on the one hand, the surface temperature of the outer frame body is low and insulated, greatly improving the safety of the mixing system, and on the other hand, the heat loss of the mixed gas flow is small. The mixed gas flow is repeatedly divided into three ways and converges and collides under the action of the flow channel, forming a large number of vortices, and the cold and hot gas flows are fully and uniformly mixed in a short stroke.

[0041] In operation, the cold and hot gas flows respectively enter from the inlet of the mixing chamber, are mixed after preliminary impact, enter the Tesla-like valve unit, and the mixed gas flow bifurcates into the upper, middle and lower flow channels after entering the Tesla-like valve flow unit. The flow rates of the three gas flows are basically the same, the upper and lower gas flows flow out along the annular flow channel, converge with the middle gas flow, collide and form vortices, realize self-collision, increase the mixing intensity, and then the mixed gas flow flows out along the middle straight line and flows into the next Tesla-like valve unit. The mixed gas flow repeatedly collides in the ceramic cavity, fully mixes; in the flow process, the mixed gas flow inevitably radiates heat to the wall surface, due to the small volume advantage of the Tesla-like valve mixing chamber and the heat insulation effect of the low thermal conductivity material, the heat loss of the present mixing device is small, and the outer frame body is low temperature safe; in summary, under the action of the Tesla-like valve flow channel, the mixed gas flow can be quickly and fully mixed in a short distance without external power source, and the present mixing device can be applicable to small flow and small flow area conditions.

[0042] Those skilled in the art can easily understand that the above description is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A cold and hot air flow mixing device based on a Tesla valve, characterized in that: the mixing device comprises a base, a ceramic cavity arranged in the base, and a quartz glass cover plate, the ceramic cavity is provided with a hot air inlet, a cold air inlet, a Tesla valve flow channel, and a mixed gas outlet which are connected in communication, and the quartz glass cover plate covers the hot air inlet, the cold air inlet, the Tesla valve flow channel, and the mixed gas outlet; the ceramic cavity is T-shaped, the hot air inlet, the cold air inlet, and the mixed gas outlet are respectively located at three ends of the ceramic cavity; the center axes of the hot air inlet and the cold air inlet coincide and are perpendicular to the length direction of the ceramic cavity, and the center axis of the mixed gas outlet is arranged along the length direction of the ceramic cavity; the Tesla valve flow channel communicates the hot air inlet, the cold air inlet, and the mixed gas outlet, and comprises a plurality of Tesla valve units which are connected in communication in sequence, the Tesla valve unit comprises a main flow channel, a middle straight flow channel, a first arc-shaped flow channel, and a second arc-shaped flow channel, the first arc-shaped flow channel and the second arc-shaped flow channel are symmetrically arranged about the middle straight flow channel; the center axes of the main flow channel and the middle straight flow channel coincide and are arranged along the length direction of the ceramic cavity; one end of the first arc-shaped flow channel, one end of the second arc-shaped flow channel, and one end of the middle straight flow channel are all connected in communication with one end of the main flow channel, and the other end of the second arc-shaped flow channel and the other end of the first arc-shaped flow channel are respectively connected in communication with the other end of the middle straight flow channel; the flow area of the main flow channel is equal to the sum of the flow areas of the middle straight flow channel, the first arc-shaped flow channel, and the second arc-shaped flow channel; the flow area of the first arc-shaped flow channel is the same as that of the second arc-shaped flow channel, and the flow area of the middle straight flow channel is smaller than that of the first arc-shaped flow channel. the ceramic cavity and the quartz glass cover plate form a mixing cavity, the mixing device further comprises a glass cover plate arranged on the base to encapsulate the mixing cavity in the base; the base and the glass cover plate constitute an outer frame, and the outer frame and the mixing cavity are filled with a closed gas.

2. The Tesla valve based cold and hot air flow mixing device of claim 1, wherein: the base is provided with a receiving groove for receiving the mixing cavity; opposite inner groove walls of the receiving groove are respectively provided with a first groove, a second groove, and a third groove, the center axes of the first groove and the second groove coincide and are perpendicular to the length direction of the base, and the center axis of the third groove is arranged along the length direction of the base; the bottom surfaces of the first groove, the second groove, and the third groove are respectively provided with a first mounting groove, a second mounting groove, and a third mounting groove, and the first mounting groove, the second mounting groove, and the third mounting groove respectively penetrate the groove wall of the receiving groove.

3. The Tesla valve-based cold and hot airflow mixing device of claim 2, wherein: ​ 4. The Tesla valve-based cold and hot airflow mixing device of claim 3, wherein: The mixing device further comprises three heat insulation plates, each of which is arranged in the first groove, the second groove and the third groove; the heat insulation plate is in the shape of a rectangle and has a receiving hole; the three ends of the ceramic cavity are arranged in the first mounting groove, the second mounting groove and the third mounting groove through the receiving holes of the three heat insulation plates respectively.

5. The Tesla valve-based cold and hot airflow mixing device of claim 1, wherein: The shape and size of the quartz glass cover plate correspond to the shape and size of the surface on which the main flow channel of the ceramic cavity is located.

6. The Tesla valve-based cold and hot airflow mixing device of claim 4, wherein: The heat insulation plate is a mica plate.

7. The Tesla valve-based cold and hot airflow mixing device of claim 2, wherein: The material of the glass cover plate is transparent glass material.

8. The Tesla valve-based cold and hot airflow mixing device of claim 7, wherein: The glass cover plate and the base are connected by bolts to complete the packaging of the mixing device, and the enclosed gas between the base and the ceramic cavity has a heat insulation effect.

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