Droplet evaporation and combustion experimental device for observing flame

Abstract

The utility model provides a droplet evaporation and combustion experimental device for observing flame. The droplet evaporation and combustion experimental device comprises a support frame; the liquid drop generating and conveying system is arranged on the experiment platform and is used for generating and conveying liquid drops; the heating system is arranged on the supporting frame and located above the liquid drop generating and conveying system, and the liquid drop generating and conveying system can convey the liquid drops to the heating system; and the shooting and data acquisition system is positioned on one side of the heating system and is used for shooting the state of the liquid drops in the heating system. According to the utility model, droplet evaporation and combustion experiments can be completed, droplet shape and flame form images can be acquired at a high speed, droplet evaporation and combustion rules can be further obtained, and deeper understanding of atomization combustion is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to evaporation combustion experiment system technical field, concretely relates to a liquid drop evaporation and combustion experimental device for observing flame. BACKGROUND

[0002] In the power device such as aeroengine combustion chamber, rocket propulsion system, gas turbine, liquid fuel carries out high -efficient combustion in atomization form, and the atomization quality and combustion process of fuel directly influence device combustion efficiency and pollutant emission. However, it is more difficult to carry out atomization combustion research directly in real combustion system. Atomization combustion is composed of the combustion of many liquid drops, and the evaporation and combustion of liquid drops are one of the important basic links of atomization combustion. Therefore, carrying out in -depth research on the characteristics of liquid drop evaporation and combustion, obtaining the evaporation and combustion law of liquid drop, can more clearly observe the specific process of fuel combustion, and help to deepen the understanding of liquid atomization combustion phenomenon.

[0003] At present, the liquid drop suspension device for liquid drop high-temperature evaporation and combustion mostly adopts vertical suspension method or horizontal suspension method, and adopts the method of vertical or horizontal rod support. For the vertical suspension method, the vertical rod body will affect the observation of the flame above the liquid drop, for example, the patent "a liquid drop combustion experimental device", the patent "a visual device for liquid drop evaporation and combustion under high temperature and high pressure and its using method" adopt the vertical rod body to connect the curved wire to suspend the liquid drop, but the vertical length of the curved wire is lower than the height of the flame, and the vertical rod body will directly touch the flame, affecting the propagation of the flame. For the horizontal suspension method, the patent "single particle fuel liquid drop combustion high-temperature experimental system" adopts the horizontal rod body to support the "U" type suspension wire, compared with the width of the flame, the flame may spread more than the width of the suspension wire in the horizontal direction, which interferes with the propagation of the flame in the horizontal direction. The related researchers also use "Y" type support in the research paper, but it is difficult to observe the flame below the liquid drop. Therefore, it is necessary to improve the suspension method, so that it can support the liquid drop while avoiding affecting the propagation of the flame. In addition, the temperature control device is used to control the heating process, and a series of heat preservation measures are taken for the heating furnace, so that the temperature in the heating furnace body can smoothly rise to the required value and maintain stable, and the interference of air convection is avoided. UTILITY MODEL CONTENTS

[0004] Therefore, the utility model provides a liquid drop evaporation and combustion experimental device for observing flame, which can achieve the purpose of self-ignition of liquid drop, effectively shoot the evaporation and combustion process of liquid drop, reveal the single liquid drop combustion and liquid drop breaking mechanism, provide important theoretical support for atomization combustion research, and provide important support for high-efficiency combustion in the combustion chamber of various liquid drop fuel power devices.

[0005] The utility model provides the following technical scheme: a kind of liquid drop evaporation and combustion experimental device for observing flame, comprising: support frame;Liquid drop generation and transmission system, it is set on experimental platform and is used to generate and transmit liquid drop;Heating system, it is set on support frame and is located above liquid drop generation and transmission system, liquid drop generation and transmission system can send liquid drop to heating system;Photographing and data acquisition system, it is located in the side of heating system and is used to photograph the state of liquid drop in heating system.

[0006] Further, the liquid drop generation and transmission system includes: a stepper motor disposed on the experimental platform; a liquid drop suspension device disposed on the stepper motor, and the stepper motor can drive the liquid drop suspension device to move in a vertical direction; and a syringe for generating liquid drops on the liquid drop suspension device.

[0007] Further, the stepper motor includes: a telescopic push rod capable of extending and retracting in a vertical direction; and a storage platform disposed at the top end of the telescopic push rod, and the liquid drop suspension device is fixedly disposed on the storage platform.

[0008] Further, the liquid drop suspension device includes: a suspension bracket in a V-shaped structure, wherein the lower end of the suspension bracket is a closed end and connected with the stepper motor; and a suspension wire in a V-shaped structure, wherein the suspension wire is disposed at the upper end of the suspension bracket, and the liquid drop can be suspended at the sharp corner of the V-shaped structure.

[0009] Further, the heating system includes: a heat insulation pad plate disposed on the support frame; a heating furnace body disposed on the heat insulation pad plate, wherein the heating furnace body has an inner cavity, and the heat insulation pad plate and the heating furnace body are both provided with a through hole for the liquid drop generation and transmission system to pass through; a heating rod disposed in the inner cavity; and a temperature control system electrically connected with the heating rod and used for controlling the heating power of the heating rod.

[0010] Further, the side wall of the heating furnace body is provided with light windows arranged in mirror symmetry, and the heating rod is arranged in a staggered manner with the light windows and the through hole.

[0011] Further, the temperature control system includes: a direct current power source electrically connected with the heating rod; a temperature controller electrically connected with the direct current power source; and a thermocouple disposed on the heating furnace body and electrically connected with the temperature controller.

[0012] Further, the heating system further includes a temperature insulation layer covering the outer periphery of the heating furnace body, and the temperature insulation layer is provided with a through hole for the photographing and data acquisition system to photograph the liquid drop.

[0013] Further, the photographing and data acquisition system includes: an LED light source disposed at one of the light windows of the heating furnace body; and a high-speed camera disposed at the other light window of the heating furnace body.

[0014] Further, the photographing and data acquisition system further includes a computer connected with the high-speed camera.

[0015] Compared with the prior art, the above at least one technical scheme of the utility model can reach the beneficial effects at least including: the utility model can complete liquid drop evaporation and combustion experiment, and high speed collection is carried out to liquid drop shape, flame shape image, and liquid drop evaporation and combustion law is further obtained, which is favorable to deeper understanding of atomization combustion. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows, obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the premise of the drawings.

[0017] Figure 1 It is a structure schematic view of a liquid drop evaporation and combustion experiment device for observing flame of the utility model;

[0018] Figure 2 It is a liquid drop suspension device schematic view;

[0019] Figure 3 It is a heating rod arrangement mode schematic view;

[0020] Figure 4 It is a heating system and temperature control system schematic view;

[0021] Figure 5 It is a certain aviation kerosene evaporation and combustion experiment image.

[0022] Reference signs in the drawing: 1, liquid drop generation and transmission system;11, stepping motor;111, article placing table;112, telescopic push rod;12, liquid drop suspension device;121, suspension support;122, suspension wire;13, syringe;14, liquid drop;

[0023] 2, heating system;21, heating furnace body;22, heating rod;23, temperature control system;231, temperature controller;232, direct current power supply;233, thermocouple;24, temperature insulation layer;25, heat insulation pad;

[0024] 3, shooting and data acquisition system;31, LED light source;32, high speed camera;33, computer;

[0025] 4, support frame. DETAILED DESCRIPTION

[0026] The embodiments of the present application will be described in detail below with reference to the drawings.

[0027] Following, the embodiments of the present application are illustrated by specific examples, and other advantages and effects of the present application can be easily understood by those skilled in the art from the disclosure of the specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied by other different specific embodiments, and various modifications or changes can be made to the details in the specification without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0028] As Figures 1 to 4 The utility model provides a kind of liquid drop evaporation and combustion experimental device for observing flame, including liquid drop generation and transmission system 1, heating system 2, shooting and data acquisition system 3, support frame 4 etc.

[0029] Liquid drop generation and transmission system 1, installation is on experimental platform, for generating liquid drop 14 and transporting it from generation position to specified position in heating system 2, including stepper motor 11, liquid drop suspension device 12, syringe 13 etc.

[0030] Stepper motor 11, for quickly transporting liquid drop 14 from its generation position to specified position in heating system 2, including placement table 111, telescopic push rod 112 etc.

[0031] Placement table 111, fixed in the top of telescopic push rod 112, with screw connection, freely detachable, and there is a recess, for fixing suspension bracket 121.

[0032] Telescopic push rod 112, can change the length of extension to change the height of placement table 111, and is equipped with limit switch, to ensure that motor does not burn empty.

[0033] Liquid drop suspension device 12, for suspending liquid drop 14, so that liquid drop 14 can follow device movement, including suspension bracket 121, suspension wire 122 etc.

[0034] Suspension bracket 121 is "N" shape structure, selects alumina material. The feature of this shape is that the middle is open notch, and both sides are vertical edge, to provide sufficient space for flame observation.

[0035] Suspension wire 122 adopts "V" shape structure, for stabilizing liquid drop 14. Liquid drop 14 is suspended at the sharp corner of the "V" shape structure of suspension wire 122.

[0036] Syringe 13, for generating liquid drop on suspension wire.

[0037] The heating system 2 is installed on the support frame 4 and located directly above the droplet generation and delivery system 1, for heating the droplet 14 to evaporate and burn, including a heating furnace body 21, a heating rod 22, a temperature control system 23, a temperature insulation layer 24, a heat insulation pad 25 and the like.

[0038] The heat insulation pad 25 is placed on the support frame 4, made of high-temperature resistant and heat-insulating material, avoiding direct contact between the heating furnace body 21 and the support frame 4, with a central hole for transporting the droplet 14.

[0039] The heating furnace body 21 is placed on the heat insulation pad 25, with two light windows on the furnace body for observing and shooting the evaporation and combustion process of the droplet 14. The furnace bottom is provided with a hole opposite to the droplet suspension device 12, facilitating the droplet suspension device 12 to be conveyed into the furnace from below.

[0040] The heating rod 22 is made of nickel-chromium wire material, coated with high-temperature resistant magnesium powder, and sleeved with a stainless steel tube, so as to be stable, durable, anti-electricity leakage and uniformly arranged in the heating furnace body 21, and placed away from the light window view area, for uniformly heating the environment in the heating furnace body 21 and not blocking the shooting.

[0041] The temperature control system 23 includes a temperature controller 231, a direct current power supply 232, a thermocouple 233 and the like, which functions to smoothly raise the temperature in the heating furnace body 21 to the required value and maintain stability by changing the heating power of the heating rod 22.

[0042] The thermocouple 233 is used for measuring the temperature in the furnace, suspended above the heating furnace body 21, so that the head of the thermocouple 233 is located in the furnace and opposite to the droplet 14.

[0043] The temperature controller 231 is connected with the thermocouple 233 and the direct current power supply 232 respectively, which functions to adjust the output voltage of the direct current power supply 232 through PID control.

[0044] The direct current power supply 232 is connected with the temperature controller 231 and the heating rod 22 respectively, which functions to provide power for the heating of the heating rod 22.

[0045] The temperature insulation layer 24 is made of a thick plate of quartz material surrounding the heating furnace body 21 on all sides, and the space between the two is filled with thermal insulation cotton, which functions to prevent air convection and radiation to dissipate heat.

[0046] The shooting and data acquisition system 3 is installed at the same height as the droplet 14 in the heating system 2, for shooting experimental images, including an LED light source 31, a high-speed camera 32, a computer 33 and the like.

[0047] The LED light source 31 is opposite to one light window of the heating furnace body 21, providing backlight for shooting.

[0048] A high-speed camera 32, which is opposite to another light window of the heating furnace body 21, is in a horizontal line with the LED light source 31, and is used to shoot the state of the liquid drop and the shape of the flame.

[0049] A computer 33 is connected to the high-speed camera 32, and is used to operate the high-speed camera 32 and directly observe the content shot by the high-speed camera 32.

[0050] A support frame 4 is installed on an experimental platform, and is used to support the heating furnace body 21.

[0051] In an embodiment of the present application, the width of the “U” shaped part of the hanging bracket 121 is 8 mm, the height is 10 mm, and the observation height above the bracket is greater than 25 mm, which is used to observe the flame. The hanging wire 122 is a K type thermocouple wire with a diameter of 0.05 mm, which is bent into a “V” shape structure, and is adhered to the hanging bracket 121 by using high-temperature resistant insulating glue. The needle of the syringe 13 is 34G, which is conducive to generating a liquid drop with a smaller diameter. The movement speed of the stepper motor 11 is 90 mm / s, and the telescopic length is 80 mm. The diameter of the liquid drop generated by the above structure is in the range of 0.5-1.2 mm, and the time used by the liquid drop from the generation position to the final position is less than 1.0 s, and the process of the liquid drop being heated and evaporated can be ignored.

[0052] The heat insulation pad 25 is made of high-temperature resistant cement fiber asbestos board, which can resist a temperature of 1400℃, and can be insulated, fireproof, flame-retardant and heat-insulating. The heating rod 22 is 220V 160W, and the direct current power supply 232 is 0-220V 1000W. The temperature controller 231 can heat the heating furnace body 21 to a maximum temperature of 900℃, and when the temperature is 500℃, the temperature control accuracy is ±0.2℃, and when the temperature is 700℃, the temperature control accuracy is ±1℃.

[0053] The high-speed camera 32 is a thousand-eye wolf X113M, which is matched with a long-focus micro-lens with a model of Nikon AF MicroNikkor 105mm f / 2.8D. The sampling frequency of the image should be appropriately adjusted according to the evaporation rate on the premise of meeting the shooting requirements, and the range is set to 200-1000 fps, the resolution is 672×1000 pixels, and the exposure time is 700μs.

[0054] In an embodiment of the present application, the RP-3 aviation kerosene liquid drop is subjected to evaporation and combustion experiments, and the experimental results are as follows Figure 5The droplet suspension device has less interference to flame diffusion in each direction, the flame state is stable, the shooting effect is better, and it is indicated that the heating performance of the device is stable, the required high-temperature environment can be achieved and stably maintained, and the droplet suspension mode does not interfere with the flame diffusion, and is used for observing and evaluating the flame state.

[0055] The utility model discloses the beneficial effects are:

[0056] (1) the utility model discloses adopting the " N " shape structure suspension bracket suspends the droplet, avoids the interference of support to flame diffusion, can very good observation appears in the flame of the periphery of droplet in the combustion process of droplet.

[0057] (2) the utility model discloses adopting temperature control system to control the heating process, utilizes PID control principle to change the voltage of the both ends of heating rod, and then controls its heating power, makes the temperature in the heating furnace body can smoothly rise to the required value and maintains stable, avoids the long time high -power operation of heating process to cause the heating rod to be overheated and be damaged. Meanwhile, the heating rod adopts nickel chrome silk material, and the high -temperature resistant magnesium powder is matched, and the stainless steel pipe is sleeved, makes it stable durable, and the burning is not easy.

[0058] (3) through heat -insulating cotton, quartz light window etc. to the heat -proof treatment of heating furnace, avoids the temperature of the place of suspending droplet to be higher and lead to the evaporation of droplet in advance, reduces the heat dissipation, and better maintains the high -temperature environment in the heating furnace. Meanwhile, adopt high -speed rate stepping motor to convey the droplet, makes the droplet reach the specified position in the heating furnace in less than 1s, reduces the loss caused in the transportation process of droplet.

[0059] The above is only the specific embodiment of the application, but the protection scope of the application is not limited to this, any person skilled in the art can easily think of the change or replacement in the technical range disclosed in the application, and all should be covered in the protection scope of the application. Therefore, the protection scope of the application should be limited by the protection scope of the claims.

Claims

1. A droplet evaporation and combustion experimental apparatus for observing a flame, characterized by, The device comprises: a support frame (4); a droplet generation and delivery system (1) arranged on an experimental platform and used for generating and delivering droplets (14); a heating system (2) arranged on the support frame (4) and above the droplet generation and delivery system (1), the droplet generation and delivery system (1) being capable of delivering the droplets (14) to the heating system (2); a photographing and data acquisition system (3) arranged on one side of the heating system (2) and used for photographing the state of the droplets (14) in the heating system (2).

2. The droplet evaporation and combustion experiment apparatus for observing a flame according to claim 1, wherein The droplet generation and delivery system (1) comprises: a stepper motor (11) arranged on the experimental platform; a droplet hanging device (12) arranged on the stepper motor (11) and capable of being driven by the stepper motor (11) to move in a vertical direction; a syringe (13) used for generating droplets (14) on the droplet hanging device (12).

3. The droplet evaporation and combustion experiment apparatus for observing a flame according to claim 2, wherein The stepper motor (11) comprises: a telescopic push rod (112) capable of extending and retracting in a vertical direction; a placement table (111) arranged at the top end of the telescopic push rod (112), and the droplet hanging device (12) being fixedly arranged on the placement table (111).

4. The droplet evaporation and combustion experiment apparatus for observing a flame according to claim 2, wherein The droplet hanging device (12) comprises: a hanging bracket (121) in the shape of a V, the lower end of the hanging bracket (121) being a closed end and being connected with the stepper motor (11); a hanging wire (122) in the shape of a V, the hanging wire (122) being arranged at the upper end of the hanging bracket (121), and the droplets (14) being capable of being hung at the sharp corners of the V-shaped structure.

5. The droplet evaporation and combustion experiment apparatus for observing a flame according to claim 1, wherein The heating system (2) comprises: a heat insulation pad (25) arranged on the support frame (4); a heating furnace body (21) arranged on the heat insulation pad (25), the heating furnace body (21) having an inner cavity, and the heat insulation pad (25) and the heating furnace body (21) both being provided with a through hole for the droplet generation and delivery system (1) to pass through; a heating rod (22) arranged in the inner cavity; a temperature control system (23) electrically connected with the heating rod (22) and used for controlling the heating power of the heating rod (22).

6. The droplet evaporation and combustion experiment apparatus for observing a flame according to claim 5, wherein The sidewall of the heating furnace body (21) is provided with light windows arranged in mirror symmetry, and the heating rod (22) is arranged in a staggered manner with the light windows and the through hole.

7. The droplet evaporation and combustion experiment apparatus for observing a flame according to claim 5, wherein The temperature control system (23) comprises: a direct current power supply (232) electrically connected with the heating rod (22); a temperature controller (231) electrically connected with the direct current power supply (232); a thermocouple (233) arranged on the heating furnace body (21) and electrically connected with the temperature controller (231).

8. The droplet evaporation and combustion experiment apparatus for observing a flame according to claim 5, wherein The heating system (2) further comprises a temperature insulation layer (24) covering the outer periphery of the heating furnace body (21), and the temperature insulation layer (24) is provided with a through hole for the photographing and data acquisition system (3) to photograph the droplets (14).

9. The droplet evaporation and combustion experiment apparatus for observing a flame according to claim 6, wherein The photographing and data acquisition system (3) comprises: an LED light source (31) arranged at one of the light windows of the heating furnace body (21); a high-speed camera (32) arranged at the other light window of the heating furnace body (21).

10. The droplet evaporation and combustion experiment apparatus for observing a flame according to claim 9, wherein The photographing and data acquisition system (3) further comprises a computer (33) connected with the high-speed camera (32).

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