Inertia-level blade capable of automatically changing size of water conveying groove and thickness of blade according to airflow speed
By introducing the automatically adjusted blade thickness and water tank size functions into the inertial stage blades, combined with the staggered hydrophilic coating and hydrophobic coating, the problem of degradation of purification efficiency caused by the increase in air flow and flow velocity in the gas turbine intake system is solved, and efficient gas-water separation and low resistance operation are achieved.
Patent Information
- Application Number
- CN202510123655.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-26
- Publication Date
- 2025-04-25
AI Technical Summary
In the gas turbine intake system, as the air flow rate and flow rate increase, the purification efficiency of the inertial stage blades decreases, and the droplets may splash again, resulting in a decrease in the quality of the intake. When trying to improve the purification efficiency, the pneumatic resistance increases, affecting the stable operation of the gas turbine.
An inertial-level blade is designed, whose blade thickness and water tank size can be automatically adjusted according to the airflow speed, and this function is achieved using thermally sensitive heterocontraction composites. At the same time, the hydrophilic coating and hydrophobic coating are used to enhance the capture and transport efficiency of liquid droplets and prevent secondary splashing.
Under different airflow velocities, the blade thickness and water supply tank size are automatically adjusted, which improves the gas-water separation efficiency of inertia-level blades, reduces pneumatic resistance, ensures the long-term stable and efficient operation of the gas turbine, and improves the intake quality.
Smart Images
Figure CN119878371A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of inertia stage blades in an air intake filter device, and in particular relates to an inertia stage blade which automatically changes the size of a water delivery trough and the thickness of a blade according to air flow velocity. Background Art
[0002] The inertia stage blade is a main component installed in the filter device of the gas turbine intake system. It is used to filter out solid and liquid particles, as well as impurities such as salt spray aerosols in the air inhaled by the gas turbine. The main purification object is the salt spray liquid particles floating in the marine environment. With the rapid development of gas turbine design and manufacturing technology, the output power of gas turbines is increasing, and its inlet air flow rate is also increasing. Taking GE's LM2500 series gas turbine as an example, the output power and inlet air flow data of the gas turbine are shown in Table 1.
[0003] Table 1 LM2500 series gas turbine output power and inlet air flow data
[0004]
[0005] It can be found from Table 1 that as the output power of the LM2500 series gas turbines continues to increase, their inlet air flow rate is also increasing. Due to the space limitations of the ship's gas turbine intake system, when the intake flow area remains unchanged, as the gas turbine inlet air flow rate increases, the flow rate of the airflow through the inertia stage blades of the intake filter device increases accordingly. In addition, when the gas turbine quickly maneuvers from a low operating condition to a high operating condition, the speed of the airflow through the inertia stage blades will also increase. As the airflow speed increases, the amount of salt spray droplets carried in the incoming air per unit time increases dramatically, which puts tremendous pressure on the instantaneous water purification capacity of the inertia stage blades.
[0006] At present, the inertia stage blades capture and collect liquid particles in the incoming air through the deflected water trough structure to improve the intake quality of the gas turbine. However, when the number of liquid particles in the air increases sharply, the purification efficiency of the inertia stage blades will be seriously affected. On the one hand, the droplets spread on the inner wall of the water trough to form a liquid film, which cannot fall by gravity and be effectively collected; on the other hand, the droplets on the outer wall may be "secondarily splashed" due to the action of high-speed airflow, and then mixed with the incoming air again, reducing the intake quality. In addition, the accumulation of droplets will cause the water trough to be blocked in a short period of time, weakening its ability to capture and transport droplets, further threatening the stable operation of the gas turbine.
[0007] According to the design principle of the inertia stage blades, although the droplet separation efficiency can be improved by increasing the blade thickness or enlarging the water trough size to solve the problem under high flow rate and large water volume conditions, this will also increase the aerodynamic resistance, resulting in a loss of total intake pressure, which cannot meet the requirements of daily operation of the gas turbine. If thinner blades or conventional-sized water troughs are used, although the aerodynamic resistance can be reduced, the separation efficiency and conveying capacity are insufficient under the conditions of high flow rate and a large number of droplets, and the intake quality of the gas turbine under different working conditions cannot be ensured. Therefore, it is necessary to develop an intake filter device that can automatically adjust the blade thickness and water trough size according to the incoming air flow rate, so as to continuously improve the purification and separation efficiency of the inertia stage blades without significantly increasing the resistance loss, and ensure the long-term stable and efficient operation of the gas turbine. Summary of the invention
[0008] The purpose of the present invention is to provide an inertia-stage blade that automatically changes the size of the water delivery trough and the thickness of the blade according to the air flow velocity. Under the condition of a large amount of salt spray liquid particles intake, it can quickly transport liquid particles and continuously capture and adsorb droplet particles, thereby improving the intake quality of the gas turbine.
[0009] An inertia-stage blade that automatically changes the size of a water delivery trough and the thickness of a blade according to the air flow velocity is used to separate a gas-water mixed air flow at 10°C to 30°C; the inertia-stage blade includes an inlet guide plate, an outlet guide plate and a water delivery unit; the water delivery unit has multiple groups, including transition guide plates and water delivery troughs; the inlet guide plate, the outlet guide plate and the transition guide plates of each group of water delivery units all adopt the same three-layer sandwich form, including an upper metal material plate, a central core layer structure plate and a lower metal material plate, and the upper metal material plate and the lower metal material plate are evenly provided with Microporous structure, the central core layer structural plate material adopts the first heat-sensitive differential shrinkage composite material. When the air flow speed is greater than the critical value, the surface temperature of the inertia stage blade is lower than the critical value of the first heat-sensitive differential shrinkage composite material, and the central core layer structural plate material only changes in size in the vertical direction, causing the blade thickness of the inertia stage blade to change; the water delivery troughs of each group of water delivery units adopt the same second heat-sensitive differential shrinkage composite material. When the air flow speed is greater than the critical value, the surface temperature of the water delivery trough is lower than the critical value of the second heat-sensitive differential shrinkage composite material, and the water delivery trough only changes in size in the length direction.
[0010] Furthermore, multiple groups of inertia stage blades are arranged vertically facing the direction of airflow, each group of inertia stage blades are parallel to each other and maintain a distance between them, an airflow channel is formed between two adjacent groups of inertia stage blades, the inlet guide plate and the outlet guide plate are arranged parallel to the direction of airflow, and the opening direction of the water delivery trough of each water delivery unit is toward the direction of airflow.
[0011] Furthermore, the installation angle range between the inlet guide plate and the transition guide plate is 135° to 165°; the installation angle range between the transition guide plates of adjacent water transfer units is 90° to 150°.
[0012] Furthermore, in the initial state, the thickness of the inlet guide plate, the outlet guide plate and the transition guide plate of each group of water transfer units is L, the thickness of the upper metal material plate is the same as that of the lower metal material plate, the thickness L1 of the central core layer structure plate is L1∈[0.3L,0.5L], and the thickness of the central core layer structure plate is automatically adjusted within the range of L1 to 8.5L1 under the influence of air flow velocity.
[0013] Furthermore, the first heat-sensitive differential shrinkage composite material constituting the central core layer structural plate is designed according to the actual application conditions of the inertia stage blade. If the maximum velocity of the airflow in the application condition is known to be x max , then the first heat-sensitive shrinkage composite material is designed to satisfy the following deformation formula:
[0014]
[0015] Wherein, y1(x) is the deformation of the first heat-sensitive differential shrinkage composite material, x is the airflow velocity; x1 is the critical airflow velocity at which the first heat-sensitive differential shrinkage composite material begins to deform, x1=x max / 1.8; x2 is the airflow velocity that causes the first heat-sensitive differential shrinkage composite material to deform, that is, after x>x2, the first heat-sensitive differential shrinkage composite material will no longer continue to expand, x2=x max ; a is the deformation parameter of the first thermosensitive shrinkage composite material, a=1±0.2.
[0016] Furthermore, in the initial state, the length L2 of the water delivery trough of each group of water delivery units is L2∈[8L,10L], and under the influence of the air flow velocity, the length of the water delivery trough of each group of water delivery units is automatically adjusted within the range of L2 to 1.375L2.
[0017] Furthermore, the second heat-sensitive differential shrinkage composite material constituting the water delivery trough of each water delivery unit is designed according to the actual application conditions of the inertia stage blade. If the maximum velocity of the airflow in the application condition is known to be x max , then the second heat-sensitive shrinkage composite material is designed to satisfy the following deformation formula:
[0018]
[0019] Wherein, y2(x) is the deformation amount of the second heat-sensitive differential shrinkage composite material, b is the deformation parameter of the second heat-sensitive differential shrinkage composite material, and b=0.8±0.1.
[0020] Furthermore, a transition section is provided between the water delivery trough and the transition guide plate, and the length of the transition section is 0.8L~L.
[0021] Furthermore, the outer wall surfaces of the inlet guide plate, the outlet guide plate and the transition guide plates of each group of water transfer units are provided with a hydrophilic coating and a hydrophobic coating, and the hydrophilic coating and the hydrophobic coating are arranged alternately in a grid form; the hydrophilic coating is used to adsorb water in the airflow and quickly converge it into droplets, and the hydrophobic coating is used to quickly transport and discharge the droplets. By arranging the hydrophilic coating and the hydrophobic coating alternately, the capture area of the droplets is increased, and before they converge to form large-volume droplets, the droplets are transported and discharged using the characteristics of the hydrophobic coating to prevent the occurrence of secondary splashing.
[0022] Furthermore, the thickness of the hydrophilic coating is 0.15L~0.25L, the side length in the height direction is L~1.5L, and the side length in the flow direction is L~1.5L; the thickness of the hydrophobic coating is 0.15L~0.25L, the side length in the height direction is L~1.5L, and the side length in the flow direction is 0.8L~1.2L.
[0023] The beneficial effects of the present invention are:
[0024] The present invention can automatically change the thickness of the blades and the size of the water delivery trough according to the size of the air flow velocity, and adjust the strength of the inertia-level blades' ability to capture and transport droplets by changing the spacing of the inertia-level blades and the size of the water delivery trough, and solve the problem of water delivery trough blockage, thereby ensuring the efficient gas-water separation efficiency of the inertia-level blades under different air flow velocity conditions. At the same time, through the combined effect of the staggered hydrophilic coating and the hydrophobic coating, small droplets are gathered into large droplets, thereby improving the capture and transportation efficiency of liquid particles and preventing the occurrence of the "secondary splash" phenomenon. The present invention has the characteristics of simple structure, convenient processing, high efficiency and reliability, and low cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1a It is a schematic diagram of the two-dimensional structure of the present invention.
[0026] Figure 1b It is a partial enlarged structural schematic diagram of the present invention.
[0027] Figure 2a It is a schematic diagram of the inertia stage blade structure when the water channel length is 8.3 mm (not extended).
[0028] Figure 2b This is a schematic diagram of the inertia stage blade structure when the water channel length is 9.8mm (extended 1.5mm).
[0029] Figure 2c This is a schematic diagram of the inertia stage blade structure when the water channel length is 11.3mm (elongation 3.0mm).
[0030] Figure 3a This is a schematic diagram of the inertia stage blade structure when the blade thickness is 1.2 mm (not extended).
[0031] Figure 3b This is a schematic diagram of the inertia stage blade structure when the blade thickness is 2.2 mm (elongation 1 mm).
[0032] Figure 3c This is a schematic diagram of the inertia stage blade structure when the blade thickness is 3.2 mm (elongation 2 mm).
[0033] Figure 4a It is a schematic diagram of the coating structure at the inlet guide plate position.
[0034] Figure 4b This is a schematic diagram of the coating structure at the water trough location.
[0035] Figure 5 It is the velocity field and the motion trajectory distribution diagram of droplet particles in the inertial blade channel. Among them, (a) is the velocity field distribution diagram in the inertial blade channel when the water trough length is 8.3mm and the blade thickness is 1.2mm (not stretched); (b) is the motion trajectory distribution diagram of droplet particles in the inertial blade channel of the corresponding structure. (c) is the velocity field distribution diagram in the inertial blade channel when the blade thickness is 3.2mm (stretched 2mm), (d) is the motion trajectory distribution diagram of droplet particles in the inertial blade channel of the corresponding structure. (e) is the velocity field distribution diagram in the inertial blade channel when the water trough length is 11.3mm (stretched 3.0mm), (f) is the motion trajectory distribution diagram of droplet particles in the inertial blade channel of the corresponding structure.
[0036] Figure 6a is a schematic diagram of the two-dimensional arrangement of the present invention in the installed state,
[0037] Figure 6b It is a schematic diagram of the three-dimensional arrangement of the present invention in the installed state. DETAILED DESCRIPTION
[0038] The present invention is further described below in conjunction with the accompanying drawings.
[0039] The present invention provides an inertia-stage blade that automatically changes the size of a water delivery trough and the thickness of a blade according to the air flow velocity, and is used to separate a gas-water mixed air flow at 10°C to 30°C; the inertia-stage blade includes an inlet guide plate, an outlet guide plate, and a water delivery unit; the installation angle between the inlet guide plate and the transition guide plate is in the range of 135° to 165°; the installation angle between the transition guide plates of adjacent water delivery units is in the range of 90° to 150°. A transition section is provided between the water delivery trough and the transition guide plate, and the length of the transition section is 0.8L to L. Multiple groups of inertia-stage blades are arranged vertically facing the incoming direction of the air flow, and each group of inertia-stage blades is parallel to each other and maintains a spacing, and an air flow channel is formed between two adjacent groups of inertia-stage blades, the inlet guide plate and the outlet guide plate are arranged parallel to the incoming direction of the air flow, and the opening direction of the water delivery trough of each water delivery unit faces the incoming direction of the air flow.
[0040] The water delivery unit includes a transition guide plate and a water delivery trough; the inlet guide plate, the outlet guide plate and the transition guide plates of each group of water delivery units all adopt the same three-layer sandwich form, including an upper metal material plate, a central core layer structural plate and a lower metal material plate, the upper metal material plate and the lower metal material plate are both provided with microporous structures, the central core layer structural plate adopts a first heat-sensitive differential shrinkage composite material, when the air flow velocity is greater than a critical value, the surface temperature of the inertia stage blade is lower than the critical value of the first heat-sensitive differential shrinkage composite material, the central core layer structural plate only undergoes a dimensional change in the vertical direction, so that the blade thickness of the inertia stage blade changes; the water delivery trough of each group of water delivery units adopts the same second heat-sensitive differential shrinkage composite material, when the air flow velocity is greater than a critical value, the surface temperature of the water delivery trough is lower than the critical value of the second heat-sensitive differential shrinkage composite material, and the water delivery trough only undergoes a dimensional change in the length direction.
[0041] In the initial state, the thickness of the inlet guide plate, outlet guide plate and transition guide plate of each group of water delivery units is L, the thickness of the upper metal plate is the same as that of the lower metal plate, the thickness L1 of the central core structure plate is L1∈[0.3L,0.5L], and the thickness of the central core structure plate is automatically adjusted within the range of L1 to 8.5L1 under the influence of the airflow velocity. In the initial state, the length L2 of the water delivery trough of each group of water delivery units is L2∈[8L,10L], and the length of the water delivery trough of each group of water delivery units is automatically adjusted within the range of L2 to 1.375L2 under the influence of the airflow velocity.
[0042] The heat-sensitive shrinkage composite material is designed according to the actual application conditions of the inertia-stage blade. If the maximum airflow velocity in the application condition is known to be x max , then the first heat-sensitive shrinkage composite material is designed to satisfy the following deformation formula:
[0043]
[0044] Wherein, y1(x) is the deformation of the first heat-sensitive differential shrinkage composite material, x is the airflow velocity; x1 is the critical airflow velocity at which the first heat-sensitive differential shrinkage composite material begins to deform, x1=x max / 1.8; x2 is the airflow velocity that causes the first heat-sensitive differential shrinkage composite material to deform, that is, after x>x2, the first heat-sensitive differential shrinkage composite material will no longer continue to expand, x2=x max ; a is the deformation parameter of the first thermosensitive shrinkage composite material, a=1±0.2.
[0045] Design the second heat-sensitive shrinkage composite material to satisfy the following deformation formula:
[0046]
[0047] Wherein, y2(x) is the deformation amount of the second heat-sensitive differential shrinkage composite material, b is the deformation parameter of the second heat-sensitive differential shrinkage composite material, and b=0.8±0.1.
[0048] The outer wall of the inlet guide plate, the outlet guide plate and the transition guide plate of each group of water delivery units is provided with a hydrophilic coating and a hydrophobic coating, which are arranged alternately in a grid form; the hydrophilic coating is used to absorb water in the airflow and quickly converge it into droplets, and the hydrophobic coating is used to quickly transport and discharge the droplets. The capture area of the droplets is increased by staggered arrangement of the hydrophilic coating and the hydrophobic coating, and the droplets are transported and discharged by using the characteristics of the hydrophobic coating before they converge to form large-volume droplets, thereby preventing the occurrence of secondary splashing. The thickness of the hydrophilic coating is 0.15L~0.25L, the side length in the height direction is L~1.5L, and the side length in the flow direction is L~1.5L; the thickness of the hydrophobic coating is 0.15L~0.25L, the side length in the height direction is L~1.5L, and the side length in the flow direction is 0.8L~1.2L.
[0049] Embodiment 1:
[0050] like Figure 1a As shown, the inertia stage blade is composed of four water delivery units. The inlet guide plate 1 is connected to the first water delivery trough 3 through the first transition guide plate 2. The first water delivery trough 3 is connected to the second water delivery trough 5 through the second transition guide plate 4, the second water delivery trough 5 is connected to the third water delivery trough 7 through the third transition guide plate 6, and the third water delivery trough 7 is connected to the fourth water delivery trough 9 through the fourth transition guide plate 8. The fourth water delivery trough 9 is connected to the outlet guide plate 10. The thickness of the inertia stage blade is uniform, and the blade thickness is L.
[0051] like Figure 1bAs shown, the first water trough 3, the second water trough 5, the third water trough 7 and the fourth water trough 9 of the inertia stage blade are made of a heat-sensitive differential shrinkage composite material. The water trough structure changes in size only in the length direction, and does not change significantly in other directions. The water trough is installed in the normal direction of the transition guide plate, at a length position of 0.8L to 1.0L from the outer surface of the transition guide plate, and the installation line of the composite material and the transition guide plate metal material is parallel to the tangent direction of the transition guide plate. The inlet guide plate 1, the first transition guide plate 2, the second transition guide plate 4, the third transition guide plate 6, the fourth transition guide plate 8 and the outlet guide plate 10 of the inertia stage blade are three-layer sandwich structures. The upper and lower layers of each plate are made of metal material, and a large number of microporous structures are evenly distributed on the metal material plate. The core layer is made of a heat-sensitive differential shrinkage composite material 11, and the core layer structure changes in size only in the direction perpendicular to the incoming flow, and does not change significantly in other directions. When no deformation occurs, the thickness of the core layer structure plate is 0.3L-0.5L, and at this time, in the thickness direction of the inertia stage blade, the thickness ratio of the upper metal material plate, the core composite material plate, and the lower metal material plate is 3:4:3. A coating 12 composed of a staggered arrangement of a hydrophilic coating and a hydrophobic coating is provided on each structural wall of the inertia stage blade.
[0052] Figure 4a and Figure 4b As shown, hydrophilic coating and hydrophobic coating are arranged on the surface of each folding plate structure of the inertia-stage blade, i.e., the inlet guide plate 1, the first transition guide plate 2, the second transition guide plate 4, the third transition guide plate 6, the fourth transition guide plate 8, and the outlet guide plate 10, and the hydrophilic coating and the hydrophobic coating are arranged alternately in the form of squares and rectangles. The coating thickness is about 0.2L. The height direction length of the staggered coating is L, and the flow direction length of the staggered coating varies according to the location, and the lengths are L and 0.8L respectively. The flow direction length of the coating at the rounded corner position of the leading edge end of the inlet guide plate 1 is L, and the flow direction length of the adjacent coating is 0.8L. The hydrophilic coating and the hydrophobic coating at the end positions of the inlet guide plate 1 and the outlet guide plate 10 are arranged symmetrically along the center line of the plate structure. There is no staggered coating on the wall of the water delivery trough.
[0053] As shown in FIG6 , each inertia-stage blade is composed of an inlet and outlet guide plate, four water delivery grooves and four transition guide plates. The length of the entire blade along the flow direction is approximately 100L to 120L, and the thickness of the blade is uniform. Several blades are arranged vertically facing the incoming direction of the airflow, and the inlet guide plate 1 and the outlet guide plate 10 are arranged parallel to the airflow direction. Each blade is parallel to each other and maintains an equal spacing to work, and the blade spacing is 10.0L. In order to suppress airflow separation, the air inlet edge of the inlet guide plate 1 and the air outlet edge of the outlet guide plate 10 are both arc transitions instead of sharp straight edges. The inlet guide plate 1 is connected to the first transition guide plate 2 in an arc, and the installation angle range is 135° to 180°. The outlet guide plate 10 is connected to the fourth transition guide plate 8 in an arc, and the installation angle range is 135° to 180°.
[0054] Compared with traditional inertia-stage blades, the present invention can automatically change the thickness of the inertia-stage blades and the size of the water trough according to the speed of the incoming air, thereby adjusting the strength of the inertia-stage blades' ability to capture and transport droplets, and ensuring the efficient gas-water separation efficiency of the inertia-stage blades under different air intake conditions. It solves the problem of reduced air intake quality of the gas turbine caused by a sharp increase in the number of droplet particles in the incoming air as the air intake velocity increases. It also solves the problem of increased resistance loss caused by the large thickness of the inertia-stage blades and the size of the water trough during daily operation of the gas turbine. At the same time, the hydrophilic coating on the wall of the inertia-stage blade is used to capture small droplets, and the adjacent hydrophobic coating is used to quickly increase the surface tension of the liquid film. The liquid film is gathered into droplets for transportation by staggered arrangement of the hydrophilic coating and the hydrophobic coating. The present invention can achieve the purpose of capturing and transporting droplets not only through the water trough structure, but also through the overall plate structure of the inertia-stage blade. At the same time, the staggered arrangement of hydrophilic coating and hydrophobic coating is used to adsorb the droplets on the surface of the inertial blade, and before the droplets converge to form large volume droplets, the water transport coating characteristics are used to transport and discharge the droplets to prevent the occurrence of "secondary splashing". The purification and separation efficiency of the inertial blade is comprehensively improved. The present invention has the advantages of simple structure, convenient processing, high efficiency and reliability, and low cost.
[0055] Table 2 Traditional inertia stage blade performance test data
[0056]
[0057] As shown in Table 2, through the aerodynamic separation test of the traditional inertia stage blade, it is found that with the increase of the inlet flow rate, the resistance loss of the traditional inertia stage blade increases, and the air-water separation efficiency decreases due to the blockage of the water delivery trough. Figure 2a , Figure 2b , Figure 2cAs shown in Table 3, with the increase in the size of the water delivery trough, although the resistance loss of the inertia stage blades has increased, its separation efficiency has recovered significantly, reaching and exceeding the separation efficiency of the traditional inertia stage blades in daily stable operating conditions. Figure 5 As shown in (a), (b), (e), and (f), as the size of the water delivery trough of the inertial stage blade increases, the air flow velocity inside the inertial stage blade channel increases, and more incoming droplet particles are captured and transported by the water delivery trough, which improves the gas-water separation efficiency. Figure 3a , Figure 3b , Figure 3c As shown in the figure, although the resistance loss of the inertia stage blades increases with the increase of blade thickness, its separation efficiency is also significantly restored, reaching and exceeding the separation efficiency of the traditional inertia stage blades in daily stable operation conditions. Figure 5 As shown in (a), (b), (c), and (d), as the thickness of the inertia stage blade increases, the air flow velocity inside the inertia stage blade channel increases, and more incoming liquid droplets are captured and transported by the water trough, thereby improving the gas-water separation efficiency.
[0058] Table 3 Performance simulation data of the inertia stage blade of the present invention under high speed and large water intake conditions
[0059]
[0060] Table 4 Performance simulation data of the inertia stage blade of the present invention under high speed and large water volume intake conditions
[0061]
[0062] The present invention is used in the field of ship air intake filtration in offshore marine environments, and its specific functions are as follows:
[0063] When a ship is sailing at sea, the air inhaled by the air intake device contains a large amount of impurities such as seawater droplets, salt and aerosols. Salt is mainly dissolved in the droplet particles. The inertial stage blade uses the inertial separation principle to separate gas and liquid. The mass of air per unit volume is much smaller than the mass of droplets per unit volume. When the airflow flows through the curved flow channel of the inertial stage blade, the air can easily change the flow direction, while the droplets are affected by inertia and maintain the original state of motion. As a result, the droplets hit the wall of the inertial stage blade to form a water film, which converges and flows downstream along the wall. After entering the hydrophobic groove, it flows to the bottom under the action of gravity and is separated. The present invention relies on a water delivery trough made of a heat-sensitive differential shrinkage composite material and an inertial stage blade with a heat-sensitive differential shrinkage composite material as the core layer, which can automatically change the size of the water delivery trough and the thickness of the blade according to the airflow velocity. It is ensured that the inertial stage blade has a high gas-water separation efficiency under different air intake conditions.
[0064] In the case of replacing a high-power gas turbine, or when the gas turbine is rapidly maneuvered to increase the output power, the gas turbine intake flow increases, the inertia stage blade incoming air velocity increases, the droplet content in the air flow increases dramatically, the convective heat transfer on the surface of the inertia stage blade is enhanced, and the blade surface temperature decreases. When the incoming air velocity increases to the critical value (5m / s), the thermosensitive differential shrinkage composite material with different expansion coefficients receives the signal of increased air velocity and reduced wall temperature, and the thermosensitive differential shrinkage composite material will expand, and the water delivery trough part will expand along the length direction, causing it to become larger; and the blade will also expand perpendicular to the incoming flow direction, resulting in an increase in blade thickness, so that the water delivery capacity and separation efficiency of the inertia stage blade are improved. However, as the size of the water delivery trough increases, the flow space of the airflow through the water delivery trough gap decreases, the flow velocity further increases, and the resistance loss of the inertia stage blade increases. Therefore, at the expense of some resistance characteristics, the gas-water separation efficiency under high flow velocity conditions is significantly improved, ensuring the intake quality of the gas turbine.
[0065] When the ship is sailing under normal operating conditions, the gas turbine intake flow rate decreases, the inflow air velocity of the inertia stage blades decreases, the inflow droplet content decreases, the convective heat exchange on the surface of the inertia stage blades weakens, and the blade surface temperature rises. When the inflow air velocity is lower than the critical value (5m / s), the size of the water delivery trough made of the thermosensitive shrinkage composite material decreases, the blade thickness decreases, the air flow space becomes larger, and the air flow velocity decreases. While ensuring the separation efficiency of the inertia stage blades, the pressure loss is reduced, and the requirements for the total inlet pressure loss of the gas turbine for long-term operation are met. At the same time, the staggered arrangement of hydrophilic and hydrophobic coatings further enhances the droplet capture ability. The coating design on the blade surface enables the droplets to quickly converge into larger droplets and be quickly separated under the action of gravity and airflow, thereby improving the water delivery capacity of the blade. On the inlet guide plate of the blade and each transition guide plate, the staggered arrangement of the coating increases the droplet capture area and reduces the risk of secondary splashing and clogging. In addition, the coating size has been optimized for the design of the water trough to ensure the rapid falling of droplets, improve the capture and transportation efficiency, and ultimately improve the overall gas-liquid separation efficiency, thereby improving the air intake quality of the gas turbine.
[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. An inertia-stage blade that automatically changes the size of the water delivery trough and the thickness of the blade according to the air flow velocity, characterized in that: It is used to separate the mixed air and water flow at 10℃~30℃; the inertia stage blade includes an inlet guide plate, an outlet guide plate and a water delivery unit; the water delivery unit has multiple groups, including a transition guide plate and a water delivery trough; the inlet guide plate, the outlet guide plate and the transition guide plate of each group of water delivery units all adopt the same three-layer sandwich form, including an upper metal material plate, a central core layer structure plate and a lower metal material plate, the upper metal material plate and the lower metal material plate are evenly provided with microporous structures, the central core layer structure plate adopts a first heat-sensitive differential shrinkage composite material, when the air flow speed is greater than a critical value, the surface temperature of the inertia stage blade is lower than the critical value of the first heat-sensitive differential shrinkage composite material, the central core layer structure plate only changes in size in the vertical direction, so that the blade thickness of the inertia stage blade changes; the water delivery trough of each group of water delivery units adopts the same second heat-sensitive differential shrinkage composite material, when the air flow speed is greater than a critical value, the surface temperature of the water delivery trough is lower than the critical value of the second heat-sensitive differential shrinkage composite material, and the water delivery trough only changes in size in the length direction.
2. The inertia-stage blade that automatically changes the water delivery trough size and blade thickness according to the air flow velocity according to claim 1, characterized in that: Multiple groups of inertia stage blades are arranged vertically facing the direction of airflow, each group of inertia stage blades are parallel to each other and maintain a distance between them, an airflow channel is formed between two adjacent groups of inertia stage blades, the inlet guide plate and the outlet guide plate are arranged parallel to the direction of airflow, and the opening direction of the water delivery trough of each water delivery unit faces the direction of airflow.
3. The inertia-stage blade that automatically changes the water delivery trough size and blade thickness according to the air flow velocity according to claim 1, characterized in that: The installation angle range between the inlet guide plate and the transition guide plate is 135° to 165°; the installation angle range between the transition guide plates of adjacent water delivery units is 90° to 150°.
4. The inertia-stage blade that automatically changes the water delivery trough size and blade thickness according to the air flow velocity according to claim 1, characterized in that: In the initial state, the thickness of the inlet guide plate, the outlet guide plate and the transition guide plate of each group of water transfer units is L, the thickness of the upper metal material plate is the same as the lower metal material plate, the thickness L1 of the central core layer structure plate is L1∈[0.3L,0.5L], and the thickness of the central core layer structure plate is automatically adjusted within the range of L1 to 8.5L1 under the influence of air flow velocity.
5. The inertia-stage blade that automatically changes the water delivery trough size and blade thickness according to the air flow velocity according to claim 4, characterized in that: The first heat-sensitive differential shrinkage composite material constituting the central core structure plate is designed according to the actual application conditions of the inertia stage blade. If the maximum velocity of the airflow in the application condition is known to be x max , then the first heat-sensitive shrinkage composite material is designed to satisfy the following deformation formula: Wherein, y1(x) is the deformation of the first heat-sensitive differential shrinkage composite material, x is the airflow velocity; x1 is the critical airflow velocity at which the first heat-sensitive differential shrinkage composite material begins to deform, x1=x max / 1.8; x2 is the airflow velocity that causes the first heat-sensitive differential shrinkage composite material to deform, that is, after x>x2, the first heat-sensitive differential shrinkage composite material will no longer continue to expand, x2=x max ; a is the deformation parameter of the first thermosensitive shrinkage composite material, a=1±0.
2.
6. The inertia-stage blade that automatically changes the water delivery trough size and blade thickness according to the air flow velocity according to claim 5, characterized in that: In the initial state, the length L2 of the water delivery trough of each group of water delivery units is L2∈[8L,10L]. Under the influence of the air flow velocity, the length of the water delivery trough of each group of water delivery units is automatically adjusted within the range of L2 to 1.375L2.
7. The inertia-stage blade that automatically changes the water delivery trough size and blade thickness according to the air flow velocity according to claim 6, characterized in that: The second heat-sensitive differential shrinkage composite material constituting the water delivery trough of each water delivery unit is designed according to the actual application conditions of the inertia stage blade. If the maximum velocity of the airflow in the application condition is known to be x max , then the second heat-sensitive shrinkage composite material is designed to satisfy the following deformation formula: Wherein, y2(x) is the deformation amount of the second heat-sensitive differential shrinkage composite material, b is the deformation parameter of the second heat-sensitive differential shrinkage composite material, and b=0.8±0.
1.
8. The inertia-stage blade that automatically changes the water delivery trough size and blade thickness according to the air flow velocity according to claim 1, characterized in that: A transition section is provided between the water delivery trough and the transition guide plate, and the length of the transition section is 0.8L~L.
9. The inertia-stage blade that automatically changes the water delivery trough size and blade thickness according to the air flow velocity according to claim 1, characterized in that: The outer wall surfaces of the inlet guide plate, the outlet guide plate and the transition guide plates of each group of water delivery units are provided with a hydrophilic coating and a hydrophobic coating, and the hydrophilic coating and the hydrophobic coating are arranged alternately in a grid form; the hydrophilic coating is used to adsorb water in the airflow and quickly converge it into droplets, and the hydrophobic coating is used to quickly transport and discharge the droplets. The capture area of the droplets is increased by the staggered arrangement of the hydrophilic coating and the hydrophobic coating, and before they converge to form large-volume droplets, the droplets are transported and discharged using the characteristics of the hydrophobic coating to prevent the occurrence of secondary splashing.
10. The inertia-stage blade that automatically changes the water delivery trough size and blade thickness according to the air flow velocity according to claim 9, characterized in that: The thickness of the hydrophilic coating is 0.15L to 0.25L, the side length in the height direction is L to 1.5L, and the side length in the flow direction is L to 1.5L; the thickness of the hydrophobic coating is 0.15L to 0.25L, the side length in the height direction is L to 1.5L, and the side length in the flow direction is 0.8L to 1.2L.