RU192912U1 - FUEL TORCH RESEARCH CAMERA - Google Patents

Abstract

A chamber for studying fuel flames, including a housing 1, covers 2, 3, one or more light sources 4, a screen 5 behind which a video camera is located, fittings 6, an atomizer 7. The housing is made of two vertically mounted coaxial half-glasses, the top 12 of which are in the lower 11, with a given axial overlap. In the lower 11 half-glass, a groove is made for installing the sealing ring 13, which ensures the tightness of the connection. The value of the axial overlap of the half-cups is selected from the condition of providing an air gap of 20 to 30 mm between the outer surface of the developed flame and the surface of the screen 5 in the entire planned range of fuel injection pressures and for all types of sprayers. In the lower half-glass 11 is installed adapter 8 for mounting the nozzle 7.

Description

The utility model relates to the field of diesel engine building and can be used to study the flares formed by injecting fuel with injectors.

Atomizers of the currently most common diesel engines with undivided combustion chambers often have four to nine nozzle openings. The location of the nozzle openings is determined, inter alia, by the angles in the plane normal to the longitudinal axis of the spray (so-called angles “in plan”) and in the diametrical plane of the spray (so-called angles “in the tent”). The torches that fuel forms when exiting the nozzle openings of the atomizer are characterized, inter alia, by opening angles and range. When the injection pressure and nozzle hole angles “in the tent” change, the space occupied by fuel flares changes. When it comes to studying the movement of a torch in a gaseous environment, test facilities — stands and chambers for studying fuel flares — are required to create minimal interference with the movement of fuel: fuel droplets should not hit the inner walls of the chambers. Otherwise, not only the full development of the torch will not happen, but the research results will be inaccurate. In the well-known solutions, cameras, by their structural dimensions, are initially oriented to a narrow range of variation of the torch range. When changing the angles “in the tent” of the nozzle holes or changing the injection pressure, the range of the flares may turn out to be such that the fuel will hit the inner surfaces of the chambers, that is, studies will become impossible.

A known method of adjusting nozzles and a stand for testing and adjusting nozzles, the use of which results in the registration of the spray jet of fuel and the subsequent determination of its shape (patent RU No. 2467197, publ. 20.11.2012. Bull. No. 32). The bench for testing and adjusting nozzles, according to a well-known solution, includes a cylindrical injection chamber with two covers, a receiving tank, two illuminators, and recorders. In this case, the illuminators are rigidly fixed in the upper cover of the injection chamber, three recorders are located in the walls of the injection chamber, and the fourth recorder is fixed in the center of the lower cover of the receiving tank.

The disadvantages of the known solutions include the lack of protection against fuel from the flare at the receiving part of the recorder located on the bottom cover of the injection chamber. This affects the quality of the results.

The closest to the claimed utility model, by the set of essential features - the prototype - is an experimental bench for high-speed video shooting of a spray of fuel, including a housing, nozzle, light source, a protective screen, a video camera. A protective shield separates the light source from the fuel flame. The camcorder is protected from droplets of fuel falling onto it by removing the camcorder from the fuel plume to a distance of 1.2 m (Eskov A.V., Kiryushin I.I. Use of a high-speed digital camera to study the dynamics of the spray length of fuel. // Sat. scientific tr. / Ugra State University. - 2014. - Issue 2. - P. 29-31). It is assumed that the fuel torch moves parallel to the surface of the screen

The disadvantages of the known solutions include the lack of protection against the possible ingress of fuel from flares onto the screen, which covers the light source and worsens the illumination of the chamber space. Despite the fact that the authors of the solution talk about the parallel movement of the fuel jet relative to the protective screen, due to the angle of the opening of the torch, some of the droplets of fuel move along the paths that are not parallel to the screen and can fall on it. In addition, a significant removal of the camera from the flare reduces the accuracy of the data and unreasonably increases the size of the experimental setup.

The technical problem to which the proposed utility model is aimed is to eliminate the disadvantages of the prototype: preventing droplets of fuel from falling onto the screen, behind which the video camera is located, and expanding the capabilities of the chamber for conducting research of fuel flames using various sprayers and injection pressures.

The problem is solved by performing a chamber for studying fuel flares in the form of a body of revolution of adjustable height with the location of the nozzle in the lower part, and a screen covering the video camera in the upper part.

The novelty in the design of the chamber for studying fuel flames, proposed as a real utility model, is the location of the nozzle and the screen covering the camera and the structural design of the camera body, which allows you to adjust its size depending on the parameters of the injection and spray.

According to the invention, there is provided a chamber for researching fuel flares comprising a housing, a nozzle, light sources, a protective screen, a video camera. The body is made of two vertically mounted coaxial half-cups, the upper of which enters the bottom with a predetermined adjustable axial overlap, selected to provide an air gap of 20 to 30 mm between the outer surface of the developed torch and the screen surface, the nozzle is placed in the adapter, installed in the lower half-cup , the protective screen is located in the lid that covers the upper half-glass, in front of the video camera, and light sources are located in the side walls of the case.

These features are new, significant, non-obvious and industrially feasible and are aimed at solving the technical problem posed by a useful model.

The design of the chamber for the study of fuel flames, proposed as a real utility model, is illustrated by drawings (Fig.1, 2). The chamber for studying fuel flames includes a housing 1 (Fig. 2), a cover 2, a cover 3, one or more light sources 4, a screen 5 that closes a video camera (not shown conventionally), fittings 6, a nozzle 7 with a spray 71.

The housing 1 is made of two coaxial half-glasses, of which half-glass 11 in the working position of the chamber for studying fuel flames is upper and enters into half-glass 12, which is lower, with a given axial overlap (Fig. 2). In the half-glass 12, a groove is made for installing the sealing ring 13, which ensures the tightness of the connection.

The value of the axial overlap of the half-cups 11 and 12 is selected from the condition of providing an air gap of 20 to 30 mm between the outer surface of the developed torch and the surface of the screen 5 in the entire planned range of fuel injection pressures and for all types of sprayers.

The outer ends of the half-cups 11 and 12 are closed by covers 2 and 3, respectively. A screen 5 is installed in the central bore of the half-glass 11. The cover 3 includes one or more holes 31 for draining fuel and a bore for the adapter 8. In the adapter 8, a central hole is made for installing the nozzle 7.

Chamber for the study of fuel torches works as follows.

Based on preliminary data on the shape and size of fuel flares at a given injection pressure through a specific atomizer 71, an axial overlap of the half-cups 11 and 12 is set so as to provide an air gap of 20 to 30 mm between the outer surface of the developed flame and the surface of the screen 5.

Through the nozzles 6 create in the housing 1 a predetermined pressure of the gaseous medium in any known manner. Turn on light sources 4.

Through the nozzle 7, fuel is injected.

Using a video camera (not shown conditionally) through the screen 5 register forming fuel flares.

If the axial overlap of the half-cups 11 and 12, set during assembly of the housing 1 before starting work, turned out to be insufficient to protect the screen 4 from dropping fuel droplets from the torches - the air gap was less than necessary - change the overlap of the half-cups 11 and 12.

Due to the fact that in the working position of the chamber for studying fuel flames, the nozzle 7 is located below, the fuel is injected upward. The energy supplied to the fuel during injection through the atomizer 71 is such that the range of the flares is practically independent of the direction of injection — up or down — and is determined, to a greater extent, by the angles of the nozzle openings “in the tent”. After the full development of the torch, it is destroyed, that is, drops, having completely lost the speed of movement in the original direction, begin to fall, under the action of gravity, down. Due to the claimed location of the screen 5, which covers the video camera, the drops do not fall on the screen 5, but on the bottom cover 3 and merge from the camera through the holes 31. The presence of an air gap of 20 to 30 mm between the outer surfaces of the flares and the screen 5 ensures the cleanliness of the surface of the screen 5 and, accordingly, high quality observations.

Half-glasses 11 and 12 are fixed from possible mutual axial displacement by any known method. The method of fixing the half-cups 11 and 12 from a possible mutual axial displacement is not subject to protection in the framework of the proposed utility model.

The technical result of the proposed utility model is:

- protection of the screen in front of the camcorder from the ingress of fuel droplets and, due to this, ensuring higher accuracy of observations during research;

- expanding the scope of the camera for studying flares for various injection pressures, which determine the range of flares, and sprayer designs (for example, the angles of nozzle holes in the "tent") by changing the size of the casing.

Claims (1)

A chamber for studying fuel flames, including a housing, a nozzle, light sources, a protective screen, a video camera, characterized in that the housing is made of two vertically mounted coaxial half-glasses, the upper of which enters the lower with a predetermined adjustable axial overlap, selected to provide an air gap from 20 to 30 mm between the outer surface of the developed torch and the surface of the screen, the nozzle is placed in the transitional part installed in the lower half-glass, the protective screen is located in the lid, close the upper half-glass, in front of the video camera, and light sources are placed in the side walls of the housing.

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