KR101925015B1 - Steam generator with excellent mixing ability with combustion gas - Google Patents

Abstract

The present invention provides a steam generator having a cooling fluid spray unit with excellent mixing ability with a combustion gas, which sprays a cooling fluid to a high temperature combustion gas moving in the rear side of an ultrasonic diffuser in a rocket engine simulating a high-altitude environment to mix the combustion gas and the cooling fluid, and evaporate the combustion gas in such process so as to adjust the temperature and pressure inside equipment, generate momentum of a main flow in an ejector, and affect the flow rate ratio, the compression ratio, and the expansion ratio of the ejector, such that performance is improved. To this end, according to the present invention, the steam generator having a cooling fluid spray unit with excellent mixing ability with a combustion gas comprises: an ejection head to eject the high temperature combustion gas; a cooling pipe having a front end coupled to the ejection head, and transferring and cooling the combustion gas ejected from the ejection head; a cooling fluid spray unit disposed along the inner circumferential surface of the cooling pipe and spraying the cooling fluid, which is mixed with the combustion gas to cool the combustion gas; and a nozzle unit to eject the combustion gas and the cooling fluid mixed in the cooling pipe. The cooling fluid spray unit comprises: a first cooling fluid spray unit having a spray angle parallel to the longitudinal direction of the cooling pipe; and a second cooling fluid spray unit having a spray angle of 25 to 35° from the longitudinal direction of the cooling pipe.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a steam generator having a cooling fluid injection part having excellent mixing performance with a combustion gas,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam generator having a cooling fluid injection part having excellent mixing performance with a combustion gas, and more particularly, to a steam generator for injecting a cooling fluid into a combustion gas of high temperature moving in the rear of a supersonic diffuser By mixing the combustion gas with the cooling fluid and evaporating it through the combustion gas in this process, not only the temperature and pressure inside the equipment are controlled but also the momentum of the main flow in the ejector is generated and at the same time the flow rate, compression ratio and expansion ratio of the ejector are affected, And a cooling fluid injecting section having an excellent mixing performance with a combustion gas for improving the performance of the steam generator.

In the case of propulsion engines operating at high altitude in the course of developing space launch vehicles, ignition and combustion tests are carried out by artificially creating an environment similar to the operational altitude environment on the ground to ensure the required reliability.

The propulsion engine of the space launch vehicle is designed to have a high expansion ratio nozzle shape in order to exhibit efficient thrust performance in a low atmospheric pressure environment. When the test is performed in a super-atmospheric pressure environment with such a high expansion ratio nozzle as it is, flow separation occurs in the nozzle diffusion portion, so that the required thrust performance can not be exhibited, and it is impossible to confirm the startup characteristic and reliability in the operating environment.

Therefore, in order to overcome the problem of flow separation at the ground test of the propulsion engine described above and verify the thrust performance at the actual high altitude, the high-altitude low-pressure environment is artificially created using the high- The engine performance test is performed.

In order to construct an efficient facility for simulating the above-described low-pressure environment, the performance varies greatly depending on whether the exhaust gas of the engine driving the ejector is a dry gas or a wet gas.

As shown in FIG. 1, when the exhaust gas of the engine is a wet gas, the liquid is formed into small droplets, and the effect of the entrainment phenomenon, which is scattered in the gas or vapor and is carried by the air stream, For this reason, a steam generator is used.

However, since the cooling fluid (water) injected from the conventional steam generator is not evenly mixed with the high-temperature combustion gas injected from the injection head, it can accurately realize the required temperature and pressure under the predetermined flow condition of the propulsion machinery, There is a difficult problem in generating.

Further, the mixing failure between the cooling fluid and the combustion gas causes a local high-temperature region to be generated, and the cooling efficiency of the combustion gas is lowered, and the rocket engine devices are damaged by the heat of the combustion gas.

Korean Patent Registration No. 10-1122026 (entitled: Wastewater Gas Treatment Device for Gas Generator Combustion Test, Date of Notification: Feb. 23, 2012)

A problem to be solved by the present invention is to mix a combustion gas and a cooling fluid by injecting a cooling fluid into a high temperature combustion gas moving behind a supersonic diffuser in a rocket engine simulating a high-temperature environment and evaporating the combustion gas through the combustion gas A steam generator having a cooling fluid jetting portion having an excellent mixing performance with the combustion gas which improves the performance by affecting the flow rate, compression ratio and expansion ratio of the ejector while generating momentum of the main flow in the ejector, .

According to an aspect of the present invention, there is provided a fuel cell system including a fuel cell, a fuel cell, and a fuel cell system. The fuel cell system includes: a cooling tube having a front end coupled to the injection head, A cooling fluid injecting portion disposed along the inner circumferential surface of the cooling pipe and injected with a cooling fluid to be mixed with the combustion gas to cool the combustion gas; and a cooling fluid injecting portion disposed at a downstream end of the cooling pipe, Wherein the cooling fluid injecting portion includes a first cooling fluid injecting portion having an injection angle parallel to the longitudinal direction of the cooling pipe and a second cooling fluid injecting portion having an injection angle of 25 to 35 degrees from the longitudinal direction of the cooling pipe, Wherein the first cooling fluid ejecting portion and the second cooling fluid ejecting portion are arranged alternately according to a predetermined arrangement The present invention also provides a steam generator having a cooling fluid jetting portion having excellent mixing performance with a combustion gas.

Here, two first cooling fluid ejecting portions may be disposed between the second cooling fluid ejecting portions.

In addition, it is possible to rotate each of the first cooling fluid injectors so as not to overlap the cooling fluid injected from the first cooling fluid injecting parts arranged side by side between the second cooling fluid injecting parts to adjust the injection angle of the cooling fluid .

The steam generator having the cooling fluid injecting section having excellent mixing performance with the combustion gas according to the present invention has the following effects.

First, the high-temperature combustion gas injected from the injection head and the cooling fluid injected from the cooling fluid injection part are uniformly mixed in the predetermined flow rate condition of the propulsion engine, so that the temperature and pressure inside the facility can be accurately realized and the main flow momentum There is an advantage to be able to.

Second, the mixing of the cooling fluid (W) and the combustion gas is smoothly performed, and the steam can be smoothly generated. The generated steam is used as the working fluid of the ejector, thereby affecting the flow rate, compression ratio and expansion ratio of the ejector. There is an advantage that it is possible not only to improve but also to miniaturize the entire facility.

1 is a graph showing an entrainment phenomenon caused by an exhaust gas (a wet gas or a dry gas) of an engine driving an ejector.
FIG. 2 is a view schematically showing a steam generator having a cooling fluid jetting portion having excellent mixing performance with a combustion gas according to the present invention. FIG.
FIG. 3 is a cross-sectional view taken along the line AA 'in a steam generator having a cooling fluid jetting portion having excellent mixing performance with the combustion gas of FIG. 2;
FIG. 4 is a view schematically showing a cooling fluid injected from a first cooling fluid injecting part and a second cooling fluid injecting part in a steam generator having a cooling fluid injecting part having an excellent mixing performance with the combustion gas of FIG. 2. FIG.
FIG. 5 is a view showing a jetting region of the cooling fluid according to the change of the jetting angle of the cooling fluid jetting portion of FIG. 3; FIG.
FIG. 6 is a view showing a position of a steam generator having a cooling fluid injecting unit having an excellent mixing performance with a combustion gas according to the present invention in a rocket engine simulating a high-altitude environment.

Hereinafter, preferred embodiments of the present invention in which the above-mentioned problems to be solved can be specifically realized will be described with reference to the accompanying drawings. In describing the embodiments, the same names and the same symbols are used for the same configurations, and additional description thereof will be omitted in the following.

Referring to FIGS. 2 to 5, a steam generator having a cooling fluid jetting portion having excellent mixing performance with a combustion gas according to the present invention will be described.

 2 to 5, the steam generator having a cooling fluid injection part having excellent mixing performance with the combustion gas according to the present invention includes the injection head 100, the cooling pipe 200, the cooling fluid injection part 400 An intermediate manifold 500, and a nozzle unit 300.

As a first embodiment of the present invention, a steam generator having a cooling fluid injection part having excellent mixing performance with a combustion gas according to the present invention may be provided with a pressure environment to be realized through a steam generator having a cooling fluid injection part having excellent mixing performance with a combustion gas Set to about 0.024 bar.

The flow rate of the combustion gas and the cooling fluid W to be described later and the temperature in accordance with the mixing of the combustion gas and the cooling fluid W are intended to realize the pressure environment described above. W), and the temperature due to the mixing of the combustion gas and the cooling fluid W may vary.

The injection head 100 is a device for injecting a high temperature combustion gas into the cooling tube 200. The injection head 100 according to the present embodiment is provided with seven coaxial A swirl-type injector 110 is mounted and the combustion gas is injected from the injector.

In addition, the combustion gas used in the steam generator having the cooling fluid injecting portion having excellent mixing performance with the combustion gas according to the present invention is liquid oxygen (LOx) and an ethyl alcohol aqueous solution of 75% The temperature of the combustion gas injected from the injection head 100 is about 2609 ° C, and the flow rate of the combustion gas injected from the injection head 100 is about 0.676 kg / s.

The cooling tube 200 is formed in a tubular shape and has a front end joined to the injection head 100. The combustion gas injected from the injection head 100 in the cooling tube 200 is moved and cooled, In the embodiment, the pressure inside the cooling pipe 200 is 20 bar.

The cooling fluid injecting unit 400 includes a cooling fluid W circulated along the inner circumferential surface of the cooling pipe 200 and mixed with the combustion gas injected from the injection head 100 to cool the combustion gas, The cooling fluid W in the present embodiment is composed of water and injected and the flow rate of the cooling fluid W injected from the cooling fluid injecting section 400 is about 1.059 kg / s.

The cooling fluid injected from the cooling fluid injecting part 400 should be regulated in the outlet flow rate for the mixing ratio with the combustion gas.

This is because when the outlet flow velocity of the cooling fluid W is excessively formed as compared with the combustion gas, the momentum of the cooling fluid W becomes large, and the mixing rate of the cooling fluid W and the combustion gas The cooling effect of the combustion gas is reduced and the evaporation rate of the cooling fluid W due to the heat of the combustion gas is lowered.

Accordingly, the cooling fluid injecting unit 400 is required to adjust the outlet flow rate of the cooling fluid W in accordance with the flow velocity and the flow rate of the combustion gas, and the outlet flow velocity of the cooling fluid W is controlled by the cooling fluid injecting unit 400 and an area of the flow path inside the cooling fluid injecting unit 400. [

The cooling fluid injecting unit 400 includes a first cooling fluid injecting unit 410 and a second cooling fluid injecting unit 420.

The first cooling fluid injecting section 410 is formed to have an injection angle parallel to the longitudinal direction of the cooling pipe 200 so that the cooling fluid W from the first cooling fluid injecting section 410 And is sprayed in parallel with the longitudinal direction of the cooling pipe (200).

The second cooling fluid injecting unit 420 is formed to have an injection angle of 25 to 35 degrees from the longitudinal direction of the cooling pipe 200 and the cooling fluid injected from the second cooling fluid injecting unit 420 W is ejected at an angle of 25 to 35 degrees from the longitudinal direction of the cooling pipe 200. [

The cooling fluid injecting unit 400 includes the first cooling fluid injecting unit 410 and the second cooling fluid injecting unit 420 having different injection angles so that the flow area in the cooling pipe 200 is And the spraying angle of the cooling fluid spraying part 400 is equal to the diameter of the cooling pipe 200 and the diameter of the first cooling fluid spraying part 410 and the second cooling fluid spraying part 420, The flow rate of the cooling fluid W injected from the cooling fluid W may be varied.

3, the first cooling fluid injecting unit 410 and the second cooling fluid injecting unit 420 are alternately arranged in a predetermined arrangement. In this embodiment, Two first cooling fluid injection portions 410 are disposed between the upper and lower ends of the first cooling fluid injecting portion 410 and the second cooling fluid injecting portion 420, .

4 to 5, the cooling fluid Wa injected from the first cooling fluid injecting part 410 is injected into the edge area on the basis of the cross section of the cooling pipe 200, The cooling fluid Wb ejected from the second cooling fluid injecting section 420 is injected into the central region on the basis of the cross section of the cooling pipe 200.

That is, the cooling fluid W injected from the first cooling fluid injecting part 410 and the second cooling fluid injecting part 420 flows through the cooling pipe 200 in a uniform flow area And can be effectively mixed with the combustion gas moving inside the cooling pipe 200 by moving.

3, the cooling fluid Wa injected from the first cooling fluid injecting section 410 is supplied to the first cooling fluid injecting section 410 as shown in FIG. a part of them are superposed and sprayed as shown in Fig.

The flow of the cooling fluid W may be changed inside the cooling pipe 200 and the cooling fluid W may be changed due to the superposition of the cooling fluid W. In this case, May be generated. As a result, the mixing ratio of the combustion gas and the cooling fluid W may be reduced.

3 (b), the first cooling fluid injecting unit 410 arranged side by side between the second cooling fluid injecting units 420 is rotated at a predetermined angle so that the first cooling fluid injecting unit 410 ) Of the cooling fluid (Wa).

As shown in FIG. 3 (b), by rotating the first cooling fluid injecting section 410, as shown in FIG. 5 (b), the first cooling fluid injecting section 410 is injected from the first cooling fluid injecting section 410 The cooling fluid Wa is injected in a uniform area.

Accordingly, the cooling fluid (W) and the combustion gas are smoothly mixed to generate steam smoothly, and the generated steam is used as a working fluid of the ejector, thereby influencing the flow rate, compression ratio, and expansion ratio of the ejector So that not only the performance is improved but also the whole equipment can be miniaturized.

In addition, since the combustion gas is cooled by the cooling fluid W and the cooling fluid W is evaporated by the heat of the combustion gas, a pressure environment to be realized can be achieved.

The intermediate manifold 500 is disposed along the outer circumferential surface of the cooling pipe 200 and connected to the cooling fluid injecting unit 400 to supply the cooling fluid W to the cooling fluid injecting unit 400. As the cooling cooling fluid W is injected through the intermediate manifold 500 and the cooling fluid injecting unit 400, the cooling fluid W injected from the cooling fluid injecting unit 400 is simultaneously Pressure.

Therefore, the mixing of the combustion gas and the cooling fluid W injected at the same pressure can be performed uniformly.

The nozzle unit 300 is coupled to the downstream end of the cooling pipe 200 so that the combustion gas mixed in the cooling pipe 200 and the cooling fluid W are injected. The high-temperature combustion gas injected from the injection head 100 is mixed with the cooling fluid W to be cooled to about 62 ° C., thereby preventing damage to the nozzle unit 300 due to the heat of the combustion gas .

For example, the steam generator 1000 having a cooling fluid jetting portion having an excellent mixing performance with a combustion gas according to the present invention is provided in a rocket engine simulating the high-altitude environment shown in FIG.

First, a rocket engine that simulates a high-altitude environment equipped with a steam generator (hereinafter, referred to as a steam generator 1000) having a cooling fluid injection portion having an excellent mixing performance with the combustion gas of FIG. 6 includes an engine 2000 as a test object, A supersonic diffuser 3000 for generating an environment, a heat exchanger 4000 for cooling the exhaust gas delivered from the supersonic diffuser 3000, and an ejector 300 connected to the heat exchanger 4000 and equipped with the steam generator 1000 according to the present invention. Pressure environment after the supersonic diffuser 3000 and the supersonic diffuser 3000 through the steam generated from the steam generator 1000 according to the present invention in connection with the chamber 5000 and the ejector chamber 5000, 3000) that is used to start the engine.

6, the steam generator 1000 of the present invention is coupled to an ejector chamber 5000 positioned at a rear end of a heat exchanger and connected to a heat exchanger 4000, and the steam generator 1000 of the present invention is connected to a steam So that the momentum of the main flow of fluid can be smoothly generated in the ejector 6000. [

As described above, the present invention is not limited to the above-described specific preferred embodiments, and various changes and modifications may be made by those skilled in the art without departing from the scope of the present invention as claimed in the claims. And such variations are within the scope of the present invention.

100: injection head
110: Injector
200: cooling pipe
300:
400: cooling fluid jetting part
410: first cooling fluid ejecting part
420: second cooling fluid injection part
500: intermediate manifold
1000: Steam generator
2000: Engine
3000: Supersonic diffuser
4000: heat exchanger
5000: ejector chamber
6000: Ejector

Claims (3)

An injection head for injecting a high temperature combustion gas;
A cooling tube in which a front end is coupled to the injection head and in which the combustion gas injected from the injection head is moved and cooled;
A cooling fluid injecting portion disposed along an inner circumferential surface of the cooling pipe and being mixed with the combustion gas to inject a cooling fluid for cooling the combustion gas;
And a nozzle portion disposed at a downstream end of the cooling pipe and through which the combustion gas mixed in the cooling pipe and the cooling fluid are injected,
Wherein the cooling fluid injector comprises:
A first cooling fluid ejecting part having an ejecting angle parallel to the longitudinal direction of the cooling tube; And
And a second cooling fluid ejecting part having an ejecting angle of 25 to 35 degrees from the longitudinal direction of the cooling tube,
Wherein the first cooling fluid ejecting portion and the second cooling fluid ejecting portion are alternately arranged according to a predetermined arrangement,
And two first cooling fluid injection portions are disposed between the second cooling fluid injection portions, wherein the first cooling fluid injection portion is disposed between the first cooling fluid injection portion and the second cooling fluid injection portion. delete The method according to claim 1,
So that the cooling fluid injected from the first cooling fluid injecting portion arranged side by side between the second cooling fluid injecting portions is not overlapped with each other so that the injection angle of the cooling fluid can be adjusted by rotating each of the first cooling fluid injecting portions And a cooling fluid injecting section for mixing the combustion gas with the combustion gas.

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