Air energy storage expander low-pressure cylinder blade

Abstract

The application relates to an air energy storage expander low-pressure cylinder blade, and belongs to the technical field of air energy storage expander, which solves the technical problem of low aerodynamic efficiency of the air energy storage expander low-pressure cylinder, and comprises a static blade and a dynamic blade; the static blade is a variable cross-section bending and twisting static blade, and the dynamic blade is a variable cross-section bending and twisting dynamic blade. The range of the blade inlet angle alpha1 of the cross-sectional profile of the static blade and the dynamic blade is respectively -15 DEG to 5 DEG and -15 DEG to 40 DEG, the range of the cross-sectional pitch d is respectively 63.68mm to 109.08mm and 84.6mm to 134.1mm, the ratio of the cross-sectional pitch d to the chord length s is respectively 0.7413 to 0.7989 and 0.6955 to 0.8627, the ratio of the cross-sectional maximum thickness w to the chord length s is respectively 0.25 and 0.143 to 0.2941, and the ratio of the cross-sectional throat width h to the pitch d is respectively 0.3329 to 0.431 and 0.4527 to 0.4562.

Description

Technical Field

[0001] This invention belongs to the field of air energy storage expander technology, specifically relating to a low-pressure cylinder blade of an air energy storage expander. Background Technology

[0002] Energy storage technology is urgently needed to address the large-scale integration of renewable energy and improve the efficiency, security, and economy of conventional power systems and regional energy systems; it is considered a supporting technology for the energy revolution. Compressed air energy storage systems have advantages such as large scale, high efficiency, low cost, and environmental friendliness, and are considered one of the most promising large-scale energy storage technologies. They mainly consist of a compressor, expander, thermal storage system, and air storage chamber, such as... Figure 1 As shown, during energy storage, the system compresses air to a high temperature and pressure using a compressor, then stores the heat of compression using a thermal storage system, cooling the air and storing it in a tank. During energy release, the high-pressure air is released, and the stored heat of compression is used to heat the air, which then drives an expander to generate electricity. The expander, as one of the core components of the compressed air energy storage system, directly affects the performance and stability of the entire system due to its efficiency and reliability.

[0003] The 300MW air storage turbine consists of three cylinders: a high-pressure cylinder, a medium-pressure cylinder, and a low-pressure cylinder. Among them, the low-pressure cylinder has a large volumetric flow rate and high blade velocity, and transonic flow occurs in local areas of the blades. Currently, the low-pressure cylinder has the disadvantages of low aerodynamic efficiency and large shock wave loss, resulting in low expander efficiency. Summary of the Invention

[0004] To overcome the shortcomings of low aerodynamic efficiency and large shock wave loss in the low-pressure cylinder of an air energy storage expander, this invention proposes a blade for the low-pressure cylinder of an air energy storage expander.

[0005] The technical solution adopted by this invention to solve its technical problem is:

[0006] A low-pressure cylinder blade for an air energy storage expander, comprising stationary blades and moving blades.

[0007] The stationary blade is a variable cross-section curved-twist stationary blade. The inlet angle α1 of the stationary blade cross-section profile ranges from -15° to 5°, changing from a negative angle to a positive angle along the blade height direction. The angle first gradually decreases and then gradually increases, that is, the angle changes from a large angle to a small angle and then from a small angle to a large angle. The cross-section pitch d ranges from 63.68 mm to 109.08 mm. The ratio of the cross-section pitch d to the chord length s ranges from 0.7413 to 0.7989. The ratio of the maximum cross-section thickness w to the chord length s is 0.25. The ratio of the cross-section throat width h to the pitch d ranges from 0.3329 to 0.431, gradually decreasing along the blade height direction.

[0008] The moving blade is a variable cross-section curved-twist moving blade. The blade inlet angle α1 of the moving blade cross-section profile ranges from -15° to 40°, changing from a positive angle to a negative angle along the blade height direction. The angle first gradually decreases and then gradually increases, that is, the angle changes from a large angle to a small angle and then from a small angle to a large angle. The cross-section pitch d ranges from 84.6 mm to 134.1 mm. The ratio of the cross-section pitch d to the chord length s ranges from 0.6955 to 0.8627. The ratio of the maximum cross-section thickness w to the chord length s ranges from 0.143 to 0.2941, gradually decreasing along the blade height direction. The ratio of the cross-section throat width h to the pitch d ranges from 0.4527 to 0.4562.

[0009] The stationary blade of the low-pressure cylinder of the aforementioned air energy storage expander has the following cross-sectional profile parameters:

[0010] 0% Leaf Height Section: The entry angle of the stationary blade α1 is -15°, the ratio of pitch d to chord length s is 0.7857, the ratio of maximum thickness w to chord length s is 0.25, and the ratio of throat width h to pitch d is 0.431.

[0011] 5% of the blade height section: the inlet angle of the stationary blade α1 is -14.1°, the ratio of pitch d to chord length s is 0.7497, the ratio of maximum thickness w to chord length s is 0.25, and the ratio of throat width h to pitch d is 0.4258.

[0012] 46% of the blade height section: the inlet angle of the stationary blade α1 = -5.8°, the ratio of pitch d to chord length s is 0.7413, the ratio of maximum thickness w to chord length s is 0.25, and the ratio of throat width h to pitch d is 0.4169.

[0013] 77% of the blade height section: the inlet angle of the stationary blade α1 = 0.45°, the ratio of pitch d to chord length s is 0.7593, the ratio of maximum thickness w to chord length s is 0.25, and the ratio of throat width h to pitch d is 0.4005.

[0014] 92% of the blade height section: the inlet angle of the stationary blade α1 = 3.46°, the ratio of pitch d to chord length s is 0.7989, the ratio of maximum thickness w to chord length s is 0.25, and the ratio of throat width h to pitch d is 0.3725.

[0015] 100% blade height section: the inlet angle of the stationary blade α1 = 5°, the ratio of pitch d to chord length s is 0.7882, the ratio of maximum thickness w to chord length s is 0.25, and the ratio of throat width h to pitch d is 0.3329.

[0016] The cross-sectional profile parameters of the moving blade in the low-pressure cylinder of the aforementioned air energy storage expander are as follows:

[0017] 0% blade height section: the inlet angle of the moving blade α1 = 40°, the ratio of pitch d to chord length s is 0.6955, the ratio of maximum thickness w to chord length s is 0.2941, and the ratio of throat width h to pitch d is 0.4562.

[0018] 8% of the blade height section: the inlet angle of the moving blade α1 = 35.8°, the ratio of pitch d to chord length s is 0.7154, the ratio of maximum thickness w to chord length s is 0.2712, and the ratio of throat width h to pitch d is 0.4557.

[0019] 23% of the blade height section: the inlet angle of the moving blade α1 = 27.3°, the ratio of pitch d to chord length s is 0.745, the ratio of maximum thickness w to chord length s is 0.2354, and the ratio of throat width h to pitch d is 0.4546.

[0020] 38% of the blade height section: the inlet angle of the moving blade α1 = 18.8°, the ratio of pitch d to chord length s is 0.7714, the ratio of maximum thickness w to chord length s is 0.1994, and the ratio of throat width h to pitch d is 0.4559.

[0021] 54% of the blade height section: the inlet angle of the moving blade α1 = 10.4°, the ratio of pitch d to chord length s is 0.7935, the ratio of maximum thickness w to chord length s is 0.1746, and the ratio of throat width h to pitch d is 0.455.

[0022] 69% of the blade height section: the inlet angle of the moving blade α1 = 1.9°, the ratio of pitch d to chord length s is 0.8189, the ratio of maximum thickness w to chord length s is 0.173, and the ratio of throat width h to pitch d is 0.4544.

[0023] 77% of the blade height section: the inlet angle of the moving blade α1 = -2.3°, the ratio of pitch d to chord length s is 0.8464, the ratio of maximum thickness w to chord length s is 0.163, and the ratio of throat width h to pitch d is 0.4535.

[0024] 92% of the blade height section: the inlet angle of the moving blade α1 = -10.77°, the ratio of pitch d to chord length s is 0.8627, the ratio of maximum thickness w to chord length s is 0.153, and the ratio of throat width h to pitch d is 0.453.

[0025] 100% blade height section: the inlet angle of the moving blade α1 = -15°, the ratio of pitch d to chord length s is 0.8627, the ratio of maximum thickness w to chord length s is 0.143, and the ratio of throat width h to pitch d is 0.4527.

[0026] The beneficial effects of this invention are:

[0027] A low-pressure cylinder blade for an air energy storage expander has low exhaust loss and reasonable velocity distribution in the profile of each moving and stationary blade. The inlet and outlet angles of each two-dimensional blade are reasonably matched. The blade design reduces secondary flow loss, wake loss and shock wave loss, resulting in high aerodynamic efficiency.

[0028] A blade for a low-pressure cylinder of an air energy storage expander is used in the low-pressure cylinder of a 300MW-class air energy storage expander. Through theoretical calculation and CFD simulation, it improves the aerodynamic efficiency of the low-pressure cylinder by 0.5% to 1%. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of an existing air energy storage system.

[0030] Figure 2 This is a schematic cross-sectional view of the stationary blade in the direction of blade height according to Embodiment 1 of the present invention;

[0031] Figure 3 This is a schematic diagram of the stationary blade cross-section structure according to Embodiment 1 of the present invention;

[0032] Figure 4 This is a perspective view of the stationary leaf in Embodiment 1 of the present invention;

[0033] Figure 5 This is a schematic diagram of the cross-section of the moving blade in the direction of blade height according to Embodiment 1 of the present invention;

[0034] Figure 6 This is a schematic diagram of the moving blade cross-section structure according to Embodiment 1 of the present invention;

[0035] Figure 7 This is a perspective view of the moving blade in Embodiment 1 of the present invention.

[0036] Reference numerals: 1. Electric motor, 2. Compressor, 3. Thermal storage system, 4. Gas storage chamber, 5. Expander, 6. Generator. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0038] Example 1

[0039] A transonic blade for a low-pressure cylinder of an air energy storage expander is used in a 300MW-class air turbine, comprising stationary blades and moving blades.

[0040] The low-pressure cylinder stationary blade profile of the 300MW-class air energy storage expander is a variable cross-section twisted blade, such as... Figures 2-4 As shown.

[0041] in:

[0042] 0% blade height section: blade inlet angle α1 = -15°, pitch d to chord length s ratio is 0.7857, maximum thickness w to chord length s ratio is 0.25, throat width h to pitch d ratio is 0.431;

[0043] 5% blade height section: blade inlet angle α1 = -14.1°, pitch d to chord length s ratio is 0.7497, maximum thickness w to chord length s ratio is 0.25, throat width h to pitch d ratio is 0.4258;

[0044] 46% blade height section: blade inlet angle α1 = -5.8°, pitch d to chord length s ratio is 0.7413, maximum thickness w to chord length s ratio is 0.25, throat width h to pitch d ratio is 0.4169;

[0045] 77% of the blade height section: blade inlet angle α1 = 0.45°, the ratio of pitch d to chord length s is 0.7593, the ratio of maximum thickness w to chord length s is 0.25, and the ratio of throat width h to pitch d is 0.4005;

[0046] 92% of the blade height section: blade inlet angle α1 = 3.46°, the ratio of pitch d to chord length s is 0.7989, the ratio of maximum thickness w to chord length s is 0.25, and the ratio of throat width h to pitch d is 0.3725;

[0047] 100% blade height section: blade inlet angle α1 = 5°, pitch d to chord length s ratio is 0.7882, maximum thickness w to chord length s ratio is 0.25, throat width h to pitch d ratio is 0.3329.

[0048] The pitch d of each section of the still blade ranges from 63.68 mm to 109.08 mm.

[0049] The low-pressure cylinder moving blade profile of the 300MW-class air energy storage expander is a variable cross-section twisted blade, such as... Figures 5-7 As shown.

[0050] in:

[0051] The range of the blade inlet angle α for each cross-section of the moving blade is -15° to 40°.

[0052] 0% blade height section: blade inlet angle α1 = 40°, pitch d to chord length s ratio is 0.6955, maximum thickness w to chord length s ratio is 0.2941, throat width h to pitch d ratio is 0.4562;

[0053] 8% blade height section: blade inlet angle α1 = 35.8°, pitch d to chord length s ratio is 0.7154, maximum thickness w to chord length s ratio is 0.2712, throat width h to pitch d ratio is 0.4557;

[0054] 23% blade height section: blade inlet angle α1 = 27.3°, pitch d to chord length s ratio is 0.745, maximum thickness w to chord length s ratio is 0.2354, throat width h to pitch d ratio is 0.4546;

[0055] 38% blade height section: blade inlet angle α1 = 18.8°, pitch d to chord length s ratio is 0.7714, maximum thickness w to chord length s ratio is 0.1994, throat width h to pitch d ratio is 0.4559;

[0056] 54% of the blade height section: blade inlet angle α1 = 10.4°, the ratio of pitch d to chord length s is 0.7935, the ratio of maximum thickness w to chord length s is 0.1746, and the ratio of throat width h to pitch d is 0.455;

[0057] 69% blade height section: blade inlet angle α1 = 1.9°, pitch d to chord length s ratio is 0.8189, maximum thickness w to chord length s ratio is 0.173, throat width h to pitch d ratio is 0.4544.

[0058] 77% of the blade height section: blade inlet angle α1 = -2.3°, the ratio of pitch d to chord length s is 0.8464, the ratio of maximum thickness w to chord length s is 0.163, and the ratio of throat width h to pitch d is 0.4535.

[0059] 92% of the blade height section: blade inlet angle α1 = -10.77°, the ratio of pitch d to chord length s is 0.8627, the ratio of maximum thickness w to chord length s is 0.153, and the ratio of throat width h to pitch d is 0.453.

[0060] 100% blade height section: blade inlet angle α1 = -15°, pitch d to chord length s ratio is 0.8627, maximum thickness w to chord length s ratio is 0.143, throat width h to pitch d ratio is 0.4527.

[0061] The pitch d of each cross section of the moving blade ranges from 84.6 mm to 134.1 mm.

Claims

1. A low-pressure cylinder blade for an air-storage expander, characterized in that, Including still leaves and moving leaves; The stationary blade is a variable cross-section curved-twisted stationary blade. The blade inlet angle α1 of the stationary blade cross-section profile ranges from -15° to 5°, changing from a negative angle to a positive angle along the blade height direction. The angle first gradually decreases and then gradually increases, that is, the angle changes from a large angle to a small angle. Then the angle changes from small to large; the section pitch d ranges from 63.68 mm to 109.08 mm; the ratio of section pitch d to chord length s ranges from 0.7413 to 0.7989; the ratio of maximum section thickness w to chord length s is 0.25; the ratio of section throat width h to pitch d ranges from 0.3329 to 0.431, gradually decreasing along the blade height direction; The moving blade is a variable cross-section curved-twist moving blade. The blade inlet angle α1 of the moving blade cross-section profile ranges from -15° to 40°, changing from a positive angle to a negative angle along the blade height direction. The angle first gradually decreases and then gradually increases, that is, the angle changes from a large angle to a small angle. Then the angle changes from small to large; the section pitch d ranges from 84.6 mm to 134.1 mm; the ratio of section pitch d to chord length s ranges from 0.6955 to 0.8627; the ratio of maximum section thickness w to chord length s ranges from 0.143 to 0.2941, gradually decreasing along the blade height direction; the ratio of section throat width h to pitch d ranges from 0.4527 to 0.4562.

2. The low-pressure cylinder blade of the air storage expander according to claim 1, characterized in that, The profile parameters of the stationary blade are as follows: 0% Leaf Height Section: The entry angle of the still blade α1 is -15°, the ratio of pitch d to chord length s is 0.7857, the ratio of maximum thickness w to chord length s is 0.25, and the ratio of throat width h to pitch d is 0.

431. 5% leaf height section: the inlet angle of the still leaf blade α1 = -14.1°, the ratio of pitch d to chord length s is 0.7497, the ratio of maximum thickness w to chord length s is 0.25, and the ratio of throat width h to pitch d is 0.4258; 46% of the blade height section: the inlet angle of the stationary blade α1 = -5.8°, the ratio of pitch d to chord length s is 0.7413, the ratio of maximum thickness w to chord length s is 0.25, and the ratio of throat width h to pitch d is 0.4169. 77% of the blade height section: the inlet angle of the stationary blade α1 = 0.45°, the ratio of pitch d to chord length s is 0.7593, the ratio of maximum thickness w to chord length s is 0.25, and the ratio of throat width h to pitch d is 0.4005; 92% of the blade height section: the inlet angle of the still blade α1 = 3.46°, the ratio of pitch d to chord length s is 0.7989, the ratio of maximum thickness w to chord length s is 0.25, and the ratio of throat width h to pitch d is 0.3725; 100% blade height section: the inlet angle of the stationary blade α1 = 5°, the ratio of pitch d to chord length s is 0.7882, the ratio of maximum thickness w to chord length s is 0.25, and the ratio of throat width h to pitch d is 0.3329.

3. The low-pressure cylinder blade of the air storage expander according to claim 1 or 2, characterized in that, The cross-sectional profile parameters of the moving blade are as follows: 0% blade height section: the inlet angle of the moving blade α1 = 40°, the ratio of pitch d to chord length s is 0.6955, the ratio of maximum thickness w to chord length s is 0.2941, and the ratio of throat width h to pitch d is 0.4562. 8% blade height section: the inlet angle of the moving blade α1 = 35.8°, the ratio of pitch d to chord length s is 0.7154, the ratio of maximum thickness w to chord length s is 0.2712, and the ratio of throat width h to pitch d is 0.4557. 23% of the blade height section: the inlet angle of the moving blade α1 = 27.3°, the ratio of pitch d to chord length s is 0.745, the ratio of maximum thickness w to chord length s is 0.2354, and the ratio of throat width h to pitch d is 0.4546. 38% blade height section: the inlet angle of the moving blade α1 = 18.8°, the ratio of pitch d to chord length s is 0.7714, the ratio of maximum thickness w to chord length s is 0.1994, and the ratio of throat width h to pitch d is 0.4559; 54% of the blade height section: the inlet angle of the moving blade α1 = 10.4°, the ratio of pitch d to chord length s is 0.7935, the ratio of maximum thickness w to chord length s is 0.1746, and the ratio of throat width h to pitch d is 0.455; 69% of the blade height section: the inlet angle of the moving blade α1 = 1.9°, the ratio of pitch d to chord length s is 0.8189, the ratio of maximum thickness w to chord length s is 0.173, and the ratio of throat width h to pitch d is 0.4544. 77% of the blade height section: the inlet angle of the moving blade α1 = -2.3°, the ratio of pitch d to chord length s is 0.8464, the ratio of maximum thickness w to chord length s is 0.163, and the ratio of throat width h to pitch d is 0.4535; 92% of the blade height section: the inlet angle of the moving blade α1 = -10.77°, the ratio of pitch d to chord length s is 0.8627, the ratio of maximum thickness w to chord length s is 0.153, and the ratio of throat width h to pitch d is 0.

453. 100% blade height section: the inlet angle of the moving blade α1 = -15°, the ratio of pitch d to chord length s is 0.8627, the ratio of maximum thickness w to chord length s is 0.143, and the ratio of throat width h to pitch d is 0.4527.

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