CN116221775A - Double-wall vibration-proof heat shield adopting corrugated partition plate - Google Patents

Abstract

The invention provides a double-wall vibration-proof heat shield adopting a corrugated partition plate, and relates to the technical field of cooling of aeroengine combustion chambers. The vibration-proof heat shield consists of a gas film pore plate, an impact pore plate and a corrugated partition plate, and is a double-wall vibration-proof heat shield with combined action of gas film cooling and convection cooling; the air film pore plate is provided with an inclined flow air film hole with an offset angle of 30 degrees, the impact pore plate is provided with a direct flow impact hole, the corrugated partition plate is positioned between the two, and a lateral orifice is arranged. A part of the cooling air flow passes through the outer wall surface to directly cool the impact pore plate; the other part enters a double-wall structure from the impact hole under the action of pressure, is convected and cooled with high-temperature air flow, flows out of the air film hole and forms a cooling air film on the high-temperature wall surface of the air film hole plate, and prevents high-temperature fuel gas from directly contacting the air film hole plate wall surface, so that the thermal erosion of the high-temperature fuel gas is reduced; the double wall structure and corrugated baffle design can inhibit the propagation of pressure waves and sound waves in the afterburner, thereby preventing oscillatory combustion.

Description

Double-wall vibration-proof heat shield adopting corrugated partition plate

Technical Field

The invention belongs to the field of combustion chambers of gas turbines, and particularly relates to a double-wall vibration-proof heat shield adopting a corrugated partition plate.

Background

Afterburners are an important part of modern engines, and are widely applied to fighter planes and fighter planes, and gradually popularized and adopted on other high-speed models; the afterburner has the functions of spraying fuel oil into the gas flow after the turbine under the condition of keeping the maximum rotation speed of the engine and the temperature of the gas before the turbine unchanged, and re-burning the residual oxygen in the gas to further improve the temperature of the gas and increase the jet speed so as to achieve the aim of increasing the thrust; the afterburner consists of a diffuser, an oil supply device, an igniter, a flame stabilizer, a vibration-proof heat shield, an afterburner barrel and other components.

At present, a heat shield device is generally adopted to separate high-temperature fuel gas from a combustion chamber cylinder in the world, the high-temperature fuel gas and the cylinder are isolated, the vibration combustion is restrained to a certain extent, and in addition, efficient cooling technologies such as discrete cooling, laminate cooling, full-gas film cooling and the like are adopted to cool the heat shield. With the new development of the aeroengine boosting device, the thermal load of the afterburner of the future high thrust-weight ratio engine will be further increased, and further requirements are also put on the durability of the engine.

With the development of supersonic aircraft engines, the temperature of the combustion gases flowing through the afterburner has increased. In addition, as the air flow rate required for main stream combustion increases, resulting in a decrease in air flow rate for cooling, it is necessary to apply a heat shield structure having an efficient cooling capacity for the supersonic aircraft engine, i.e. to achieve a better cooling effect with as little cooling air as possible, the maximum limit reducing the temperature of the supersonic aircraft engine.

Disclosure of Invention

The invention aims to solve the technical problem of providing a double-wall vibration-proof heat shield adopting a corrugated partition plate. A double-wall vibration-proof heat shield with multiple cooling modes acting together is formed by arranging a corrugated partition plate between the impact pore plate and the air film pore plate. During normal operation, a part of cooling air flows skip the outer wall surface to directly cool the impact pore plate; the other part enters a double-wall structure from the impact hole under the action of pressure, is convected and cooled with high-temperature air flow, and flows out of the air film hole to form a cooling air film on the high-temperature wall surface so as to effectively cool the afterburner; the double-wall structure and the corrugated partition plate design can inhibit the propagation of pressure wave and sound wave in the afterburner, thereby preventing oscillation combustion, improving the working stability of the afterburner and prolonging the service life of the afterburner.

Technical proposal

The invention aims to provide a double-wall vibration-proof heat shield adopting a corrugated partition plate.

The technical scheme of the invention is as follows:

a double-wall vibration-proof heat shield adopting corrugated partition plates is characterized in that: the vibration-proof heat shield consists of an inner wall air film pore plate, an outer wall impact pore plate and a corrugated partition plate; the corrugated partition plate is positioned between the impact pore plate and the air film pore plate to form a double-layer wall vibration-proof heat screen which is jointly acted by a plurality of cooling modes; the impact pore plate, the air film pore plate and the corrugated partition plate are of a plurality of unit periodic structures along the axis direction, impact holes are uniformly distributed on the periphery of each unit impact Kong Banbi surface, air film Kong Banbi is also distributed with air film holes, orifices are arranged on two sides of the corrugated partition plate, and the impact pore plate is fixedly welded with the trapezoid reinforcing frame; the impact holes are designed to be vertical to the wall surface, the air film holes and the wall surface are 30 degrees, the number of each kind of holes in one unit is 3, and the aperture is 0.5-10mm.

A double-walled vibration-insulating screen employing corrugated partition plates as defined in claim 1 wherein: the air film pore plate, the corrugated partition plate and the impact pore plate are fixedly connected from inside to outside and the double-layer wall vibration-proof heat shield is jointly acted by a plurality of cooling modes.

A double-walled vibration-insulating screen employing corrugated partition plates as defined in claim 1 wherein: impact hole plate, air film orifice plate and ripple formula baffle are a plurality of unit periodic structure along the axis direction, and every unit impact Kong Banbi face circumference evenly distributed has impact hole, and air film Kong Banbi has the air film hole equally, and ripple formula baffle both sides are equipped with the orifice, impact hole plate and trapezoidal reinforcement frame fixed welding.

A double-walled vibration-insulating screen employing corrugated partition plates as defined in claim 1 wherein: the impact holes are designed to be vertical to the wall surface, the air film holes and the wall surface are 30 degrees, the number of each kind of holes in one unit is 3, and the aperture is 0.5-10mm.

The invention has the following beneficial effects:

the invention relates to a double-wall vibration-proof heat shield adopting a corrugated partition plate, which consists of an inner wall air film pore plate, an outer wall impact pore plate and the corrugated partition plate, and is a double-wall vibration-proof heat shield with the combined action of air film cooling and convection cooling; the inner wall air film pore plate is provided with an inclined flow air film hole with an inclined angle of 30 degrees, the outer wall impact pore plate is provided with a direct current impact hole perpendicular to the wall surface, the corrugated partition plate is positioned between the air film pore plate and the impact pore plate, and a lateral orifice is arranged. A part of the cooling air flow bypasses the outer wall surface to directly cool the impact pore plate; the other part enters a double-wall structure from the impact hole under the action of pressure, is convected and cooled with high-temperature air flow, and flows out of the air film hole to form a cooling air film on the high-temperature wall surface so as to effectively cool the afterburner; the double-wall structure and the corrugated partition plate design can inhibit the propagation of pressure wave and sound wave in the afterburner, thereby preventing oscillation combustion, improving the working stability of the afterburner and prolonging the service life of the afterburner.

Drawings

Fig. 1: double-wall vibration-proof heat shield integral schematic diagram adopting corrugated partition plate

Fig. 2: double-wall vibration-proof heat shield cross-sectional view adopting corrugated partition plate

In the figure: 1. impact hole plate 2, air film hole plate 3, ripple type baffle, 4, impact hole, 5, air film hole, 6, orifice.

Detailed Description

The invention will now be further described with reference to the accompanying drawings:

with reference to fig. 1 and 2, the present invention provides a double-wall vibration-proof heat shield using corrugated partition plates. The heat shield is of a double-layer wall structure and consists of a gas film pore plate 2, a corrugated partition plate 3 and an impact pore plate 1. Inclined flow air film holes 5 are uniformly distributed on the air film pore plate 2, and the holes and the wall surface are 30 degrees; orifices 6 are uniformly distributed on the corrugated partition plate; the impact hole plate 1 is uniformly distributed with direct current impact holes 4 which are vertical to the wall surface. The high-temperature fuel gas flowing through the turbine enters an inner channel surrounded by the air film pore plate 2, the cooling air flowing through the air compressor flows around the outer wall surface of the impact pore plate 1, and part of the cooling air and the high-temperature fuel gas enter a double-layer wall structure through the air film holes 5 and the impact holes 4 to act, so that the effects of vibration reduction and temperature reduction are achieved.

The specific process comprises the following steps: during normal operation, a part of cooling air flow flowing through the outer wall surface of the impact pore plate 1 directly flows through the wall surface, and part of heat is taken away through convection heat exchange, so that a convection cooling effect is realized; the other part of air flow enters the double-layer wall structure through the impact hole 4, directly impacts and collides with the corrugated partition plate 3 and the air film pore plate 2, takes away part of heat from the wall surface, performs impact cooling on the heat, and flows into the adjacent gap through the orifice 6; meanwhile, part of high-temperature combustion gas in the inner duct enters the double-wall structure through the diagonal flow gas film holes 5 and is mixed with cooling air flow entering the double-wall structure, and due to the existence of pressure difference, the mixed air flow flows into the inner duct through the gas film holes 5 and forms a cooling gas film on the high-temperature wall surface of the gas film pore plate 2, so that the gas film pore plate 2 is effectively prevented from being in direct contact with high-temperature gas, and the thermal erosion of the high-temperature gas on a heat shield is weakened; the arrangement of the double-layer wall structure and the design of the corrugated partition plate can also effectively inhibit the propagation of the oscillating wave generated by combustion and effectively prevent the occurrence of the oscillating combustion.

Claims (4)

1. A double-wall vibration-proof heat shield adopting corrugated partition plates is characterized in that: the vibration-proof heat shield consists of an inner wall air film pore plate, an outer wall impact pore plate and a corrugated partition plate; the corrugated partition plate is positioned between the impact pore plate and the air film pore plate to form a double-layer wall vibration-proof heat screen which is jointly acted by a plurality of cooling modes; the impact pore plate, the air film pore plate and the corrugated partition plate are of a plurality of unit periodic structures along the axis direction, impact holes are uniformly distributed on the periphery of each unit impact Kong Banbi surface, air film Kong Banbi is also distributed with air film holes, orifices are arranged on two sides of the corrugated partition plate, and the impact pore plate is fixedly welded with the trapezoid reinforcing frame; the impact holes are designed to be vertical to the wall surface, the air film holes and the wall surface are 30 degrees, the number of each kind of holes in one unit is 3, and the aperture is 0.5-10mm.

2. A double-walled vibration-insulating screen employing corrugated partition plates as defined in claim 1 wherein: the air film pore plate, the corrugated partition plate and the impact pore plate are fixedly connected from inside to outside and the double-layer wall vibration-proof heat shield is jointly acted by a plurality of cooling modes.

3. A double-walled vibration-insulating screen employing corrugated partition plates as defined in claim 1 wherein: impact hole plate, air film orifice plate and ripple formula baffle are a plurality of unit periodic structure along the axis direction, and every unit impact Kong Banbi face circumference evenly distributed has impact hole, and air film Kong Banbi has the air film hole equally, and ripple formula baffle both sides are equipped with the orifice, impact hole plate and trapezoidal reinforcement frame fixed welding.

4. A double-walled vibration-insulating screen employing corrugated partition plates as defined in claim 1 wherein: the impact holes are designed to be vertical to the wall surface, the air film holes and the wall surface are 30 degrees, the number of each kind of holes in one unit is 3, and the aperture is 0.5-10mm.

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