RU181164U1 - Plug of the intake device of a ramjet engine - Google Patents

Abstract

The invention relates to rocket science, namely, to the internal plugs of the input of the intake device to the afterburning engine of the ramjet engine. The internal plug of the input of the intake device of the ramjet engine is designed to protect control elements, distribution of main propellant and to seal the afterburner of the rocket engine storage process and on start-up mode. The plug is made of ultra-high molecular weight polyethylene and, after being discharged by the air flow coming through the air intake device, falls entirely into the volume of the afterburning chamber where, during the combustion of the propellant charge of solid fuel under the influence of the temperature of the products of fuel combustion, 2500 K or more, the plug material ignites, burns and passes into a gaseous state Acting as an additional source of energy (additional fuel cell) and providing an increase of up to 5% in the traction characteristics of RID.T Technical result - the plug provides reliable sealing of the afterburner chamber from the influence of the external environment (precipitation, corrosion, etc.) and at the time of the start-up stage and can withstand loads at a pressure in the afterburner of up to 130 atm, provides an increase of up to 5% in traction characteristics ramjet engine. 3 ill.

Description

The utility model relates to rocket science, namely, to the internal plugs of the entrance of the air intake device (VZU) into the afterburner (CD) of the rocket ramjet engine (RPD).

A rocket engine with a plug for the air duct housing is known, in which the plug of the rotary engine is made of composite material flush with the insulating lining of the skin of the engine housing. Pyrotechnic chargers are bonded to the composite material and set on fire to form an opening in the lid for air flow during operation of the VZU (US Patent No. 5784877, IPC F02K 7/18, published July 28, 1998).

A disadvantage of the known solution is the low reliability of the engine, due to the uncontrolled and unstable process of burning a hole in the plug of the VZU.

Known consumable plug of the air channel of the integrated RPD, made of layered material from Pd and A1, which burns out in the short period between the end of the starting mode and the beginning of the marching mode of the engine to ensure that the incoming air flow for the rocket engine (US Patent No. 6631610 IPC F02K 7 / 18, published October 14, 2003).

This device is taken as a prototype.

The disadvantages of the prototype are the use of expensive metal Pd and the complexity of its manufacture, requiring a set of several layers of materials in a certain sequence and thickness, as well as insufficient reliability of the plug due to the uneven combustion on its surface.

The problem to be solved, created by a useful model is to eliminate the disadvantages of the prototype, namely, simplifying the design, improving the reliability of the plug, as well as increasing the traction power of the RPD.

The aforementioned problem is solved with the help of the characteristics indicated in the first paragraph of the utility model formula common with the prototype, such as a plug of the air intake device of the rocket-ram engine located in the input window of the air intake device into the afterburner and designed to protect the control elements and the distribution of the sustainer fuel at the starting mode, and distinctive essential features such as for sealing the afterburning engine afterburner, the plug is made of ultra-high molecular weight polyethylene.

According to paragraph 2 of the utility model formula, the inlet of the air intake device is made of a lattice type, for example, of heat-treated steel KVK-26, with internal inclined stiffening ribs - jumpers, for placement and fastening of convex plug elements in the window openings.

The above set of essential features allows you to get the following technical result:

1. When storing the engine as part of an aircraft, the internal plug provides reliable sealing of the CD from the effects of the external environment (precipitation, corrosion, etc.).

2. The internal plug reliably serves for sealing the RP RPM at the time of the start-up and booster stage and can withstand loads at a pressure in the RP of up to 150 atm.

3. The internal plug is made of affordable and relatively cheap ultra-high molecular weight polyethylene, is resettable and consumable, and in the marching mode of operation of the RPD due to the combustion of ultra-high molecular weight polyethylene it is used as an additional energy source (additional fuel cell) in the flow of combustion products of solid fuel RPD, increasing to 5% traction characteristics of RPD.

Ultra-high molecular weight polyethylene (UHMWPE) - material for extreme conditions. Unlike traditional polyethylene, which is mainly used in the packaging industry, UHMWPE is used for molded parts. The strength characteristics of UHMWPE are at the level of aluminum. UHMWPE can act as a substitute for other, more expensive materials, such as steel, bronze, polyamides, fluoroplastics, and may be technically necessary, i.e. the only suitable material for this purpose [S.S. Galibeev, R.Z. Khayrullin, V.P. Arkhireyev Ultra-high molecular weight polyethylene. Trends and prospects. // Bulletin of Kazan Technological University. - 2008. - T. 2. - S. 50-55.]. In particular, UHMWPE has increased rigidity and extremely high impact strength, high resistance to aggressive environments (corrosion resistance), and high frost resistance.

At the same time, in the start - booster stage of the RPM, when the plug from the UHMWPE is exposed to an operating temperature of 2500 K or more, UHMWPE is a highly flammable and highly combustible material (combustible, easily combustible material with a high burning rate). In a utility model, the material of the VZU plug when it is discarded during operation of the RPD afterburning chamber becomes an integral part of the solid fuel combustion products.

The utility model is illustrated by the following drawings: FIG. 1 shows the layout of the internal plug of the VZU entrance to the RPD CD, where the positions denote: 1 - gas generator, 2 - the housing of the VZU, 3 - regulator, 4 - lattice type CD with a plug, 5 - afterburner;

in FIG. 2 - a lattice type window with a plug, where the positions indicated: 4 - window, 6 - plug.

in FIG. 3 - the process of resetting the plugs from the lattice type window, where the positions are: 4 - lattice type window, 6 - plug.

The internal plug (pos. 6 of Fig. 2, 3) of the lattice-type window at the entrance to the CD is a structure made of UHMWPE by pressing, casting, sintering, gel-forming, and ram-extrusion, consisting of 8 convex inclined elements, located on a single base, made in the form of a cylindrical surface, gaplessly entering the window openings. Also, the fastening of the convex elements of the plug to the openings of the window can be provided with adhesive joints or sealant with good adhesion to UHMWPE.

The lattice type window (item 4 of Fig. 2, 3) is a welded structure made of heat-treated steel KVK-26 with internal inclined stiffeners (jumpers), made by milling, laser cutting or other technological methods for placing and fixing the convex elements of the plug in the holes window. The window is connected to the cylindrical body of the RPD afterburner by welding.

The internal plug 6 (Fig. 2, 3) under the action of the braking pressure in the channel of the OVC 2 of FIG. 1 is cut off from the window and enters with the air flow entering through the OVD entirely into the volume of the cylinder 5, where during the sustainer charge of solid fuel under the influence of the temperature of the products of fuel combustion of 2500 K or more, the plug material ignites, burns and goes into a gaseous state, acting as an additional source of energy (additional fuel cell) and providing an increase of up to 5% in the traction characteristics of the RPD.

The device operates as follows:

When storing the engine as part of an aircraft, the plug 6 of FIG. 2, 3 provides reliable sealing of the combustion chamber 5 of FIG. 1 from the external environment.

At the time of the start-up stage of the RPD, the plug 6 of FIG. 2, 3 reliably serves for sealing CD 5 of FIG. 1 before switching to the marching mode of operation of the RPD.

At the moment of transition to the marching mode, the opening mechanism for resetting the internal plug is activated after the charge of the starting fuel is burned out. At the final moment of fuel charge burnout in the starting-booster stage of the RPD, the value of the calculated maximum internal pressure in the chamber, which is 130 atm, drops to atmospheric depending on the flight altitude of the aircraft. Under the action of the braking pressure in the channel of the turbojet assembly 2 of FIG. 1 inner plug 6 of FIG. 2, 3 it is cut off from the window and enters with the air flow entering through the VZU entirely into the KD 5 volume, where, during the burning of the sustainer charge of solid fuel under the influence of the temperature of the products of fuel combustion, the plug material ignites, burns and goes into a gaseous state, acting as additional energy source (additional fuel cell) and providing an increase of up to 5% in the traction characteristics of the RPD.

From the description and practical application of the present utility model, other particular forms of its implementation will be obvious to specialists. This description and drawings are considered as material illustrating a utility model, the essence of which and the scope of patent claims are defined in the following utility model formula, a set of essential features and their equivalents.

Claims (2)

1. The plug of the intake device of the rocket ramjet engine, located in the window of the intake of the intake device into the afterburner and designed to protect the control elements and the distribution of main propellant in the starting mode, characterized in that the plug is made of ultra-high molecular weight polyethylene for sealing the afterburner engine afterburner. 2. The plug according to claim 1, characterized in that the input window of the air intake device is made of a lattice type, for example, of heat-treated steel KVK-26, with internal inclined stiffening ribs - jumpers, for placement and fastening of the convex elements of the plug in the window openings.

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