Air energy storage expansion machine high-pressure cylinder based on bending and twisting movable and static blades

Abstract

The invention relates to an air energy storage expansion machine high-pressure cylinder based on bent and twisted movable and static blades, belongs to the technical field of air energy storage equipment, solves the technical problem of low pneumatic efficiency of a straight blade air energy storage expansion machine high-pressure cylinder, and comprises a movable blade and a static blade. The fixed blade is a twisted fixed blade, the movable blade is a twisted movable blade, the range of the section molded line blade inlet angle alpha of the fixed blade is-5 degrees to-5 degrees, the range of the section molded line blade inlet angle alpha of the movable blade is-35 degrees to 25 degrees, the range of the section pitch d is 42.8 mm to 53.4 mm, the range of the section pitch d is 45.4 mm to 56.8 mm, the range of the ratio of the section pitch d to the chord length s is 0.6827 to 0.776, the range of the ratio of the section pitch d to the chord length s is 0.6884 to 0.7307, the ratio of the maximum thickness w of the section to the chord length s is 0.25, and the ratio of the maximum thickness w of the section to the chord length s is 0.173 to 0.2941. And the range of the ratio of the throat width h of the section to the pitch d is 0.3157 to 0.3465, and the range of the ratio of the throat width h of the section to the pitch d is 0.3361 to

Description

Technical Field

[0001] The present invention belongs to the technical field of air energy storage equipment, and particularly relates to a high-pressure cylinder of an air energy storage expander based on curved and twisted moving and static blades. Background Art

[0002] Energy storage technology is an urgent need to solve the large-scale access of renewable energy, improve the efficiency, safety and economy of conventional power systems and regional energy systems, and is known as a supporting technology for the energy revolution. Compressed air energy storage systems have the advantages of large scale, high efficiency, low cost, environmental protection, etc., and are considered to be one of the most promising large-scale energy storage technologies. It mainly consists of a compressor, an expander, a heat storage system and a gas storage chamber. As Figure 1 shown: During energy storage, the system compresses air to a high-temperature and high-pressure state through a compressor, uses the heat storage system to store the compression heat, cools the air and stores it in a storage tank. During energy release, the high-pressure air is released, the stored compression heat is used to heat the air, and then the expander is driven to do work and generate electricity. As one of the core devices of the compressed air energy storage system, the efficiency and reliability of the expander are directly related to the performance and stability of the entire system.

[0003] The 300MW air energy storage turbine is divided into three cylinders, a high-pressure cylinder, a medium-pressure cylinder and a low-pressure cylinder. Among them, the power of the high-pressure cylinder can reach 90MW. For every 1% increase in the efficiency of the high-pressure cylinder, the unit power can be increased by 900kW. It can be seen that the aerodynamic efficiency of the high-pressure cylinder is crucial to the energy efficiency level of the entire unit. At present, the high-pressure cylinder uses traditional straight blades, which are convenient to process but have low efficiency. Summary of the Invention

[0004] In order to overcome the deficiency of the low aerodynamic efficiency of the high-pressure cylinder of the straight blade air energy storage expander, the present invention proposes a high-pressure cylinder of an air energy storage expander based on curved and twisted moving and static blades.

[0005] The technical solution adopted by the present invention to solve its technical problems is:

[0006] A high-pressure cylinder of an air energy storage expander based on curved and twisted moving and static blades, including moving blades and static blades.

[0007] The static blade is a curved and twisted static blade. The range of the blade inlet angle α of the cross-sectional profile of the static blade is -5° to 5°. Along the blade height direction, it gradually changes from a positive angle to a negative angle, first gradually decreasing and then gradually increasing, that is, from a large angle to a small angle, and then from a small angle to a large angle; the range of the cross-sectional pitch d is 42.8mm to 53.4mm; the ratio of the cross-sectional pitch d to the chord length s ranges from 0.6827 to 0.776 and gradually increases along the blade height direction; the ratio of the maximum cross-sectional thickness w to the chord length s is 0.25; the ratio of the cross-sectional throat width h to the pitch d ranges from 0.3157 to 0.3465, first gradually increasing and then gradually decreasing along the blade height direction, that is, from small to large, and then from large to small.

[0008] The moving blade is a curved and twisted moving blade. The range of the blade inlet angle α of the blade profile of the moving blade is -35° to 25°. Along the blade height direction, it gradually changes from a negative angle to a positive angle, first gradually decreasing and then gradually increasing, that is, changing from a large angle to a small angle and then from a small angle to a large angle. The range of the section pitch d is 45.4 mm to 56.8 mm. The ratio of the section pitch d to the chord length s ranges from 0.6884 to 0.7307, first gradually increasing and then gradually decreasing along the blade height direction, that is, changing from small to large and then from large to small. The ratio of the maximum section thickness w to the chord length s ranges from 0.173 to 0.2941, gradually decreasing along the blade height direction. The ratio of the section throat width h to the pitch d ranges from 0.3361 to 0.3421, gradually increasing along the blade height direction.

[0009] For the high-pressure cylinder of the above air energy storage expander, for the stationary blade, the parameters of its blade profile are as follows:

[0010] At the 0% blade height direction section: the blade inlet angle α of the stationary blade is 5°, the ratio of the pitch d to the chord length s is 0.6827, and the ratio of the throat width h to the pitch d is 0.3302;

[0011] At the 5% blade height direction section: the blade inlet angle α of the stationary blade is 4.6°, the ratio of the pitch d to the chord length s is 0.6871, and the ratio of the throat width h to the pitch d is 0.3328;

[0012] At the 46% blade height direction section: the blade inlet angle α of the stationary blade is 0.4°, the ratio of the pitch d to the chord length s is 0.7346, and the ratio of the throat width h to the pitch d is 0.3465;

[0013] At the 77% blade height direction section: the blade inlet angle α of the stationary blade is -2.7°, the ratio of the pitch d to the chord length s is 0.7617, and the ratio of the throat width h to the pitch d is 0.3337;

[0014] At the 92% blade height direction section: the blade inlet angle α of the stationary blade is -4.2°, the ratio of the pitch d to the chord length s is 0.7713, and the ratio of the throat width h to the pitch d is 0.3217;

[0015] At the 100% blade height direction section: the blade inlet angle α of the stationary blade is -5°, the ratio of the pitch d to the chord length s is 0.776, and the ratio of the throat width h to the pitch d is 0.3157.

[0016] For the high-pressure cylinder of the above air energy storage expander, for the moving blade, the parameters of its blade profile are as follows:

[0017] At the 0% blade height direction section: the blade inlet angle α of the moving blade is -30°, the ratio of the pitch d to the chord length s is 0.6884, the ratio of the maximum thickness w to the chord length s is 0.2941, and the ratio of the throat width h to the pitch d is 0.3361;

[0018] 16% blade height direction cross-section: the inlet angle α of the moving blade is -21.3°, the ratio of pitch d to chord length s is 0.704, the ratio of maximum thickness w to chord length s is 0.2712, and the ratio of throat width h to pitch d is 0.3371;

[0019] 47% blade height direction cross-section: the inlet angle α of the moving blade is -4.4°, the ratio of pitch d to chord length s is 0.7208, the ratio of maximum thickness w to chord length s is 0.2354, and the ratio of throat width h to pitch d is 0.3383;

[0020] 77% blade height direction cross-section: the inlet angle α of the moving blade is 12.6°, the ratio of pitch d to chord length s is 0.7307, the ratio of maximum thickness w to chord length s is 0.1994, and the ratio of throat width h to pitch d is 0.3402;

[0021] 95% blade height direction cross-section: the inlet angle α of the moving blade is 22.2°, the ratio of pitch d to chord length s is 0.7253, the ratio of maximum thickness w to chord length s is 0.1746, and the ratio of throat width h to pitch d is 0.3415;

[0022] 100% blade height direction cross-section: the inlet angle α of the moving blade is 25°, the ratio of pitch d to chord length s is 0.7213, the ratio of maximum thickness w to chord length s is 0.173, and the ratio of throat width h to pitch d is 0.3421.

[0023] The beneficial effects of the present invention are:

[0024] A high-pressure cylinder of an air energy storage expander based on curved and twisted moving and static blades, with small profile losses at each height of the moving and static blades, reasonable velocity distribution, reduced secondary flow losses and wake losses in the design of the moving and static blade blades, and high aerodynamic efficiency of the moving and static blade blades.

[0025] A high-pressure cylinder of an air energy storage expander based on curved and twisted moving and static blades. Through theoretical calculation and CFD simulation, the curved and twisted moving and static blades can be used in the high-pressure cylinder of a 300MW-class air energy storage system, and the aerodynamic efficiency of the high-pressure cylinder can be increased by 1%. Description of the Drawings

[0026] Figure 1 is a schematic structural diagram of an existing technology air energy storage system;

[0027] Figure 2 is a schematic diagram of the cross-section in the blade height direction of the static blade in the first embodiment of the present invention;

[0028] Figure 3 is a schematic cross-sectional structure diagram of the static blade in the first embodiment of the present invention;

[0029] Figure 4It is the perspective view of the stator blade in the first embodiment of the present invention;

[0030] Figure 5 It is the schematic cross-sectional view of the rotor blade in the first embodiment of the present invention in the height direction;

[0031] Figure 6 It is the schematic cross-sectional structure view of the rotor blade in the first embodiment of the present invention;

[0032] Figure 7 It is the perspective view of the rotor blade in the first embodiment of the present invention.

[0033] Reference numerals: 1. Motor, 2. Compressor, 3. Heat storage system, 4. Gas storage chamber, 5. Expander, 6. Generator. Detailed implementation manners

[0034] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0035] Embodiment 1

[0036] A high-pressure cylinder of an air energy storage expander based on twisted stator and rotor blades, which is used for the high-pressure cylinder of an expander in a 300 MW-class air energy storage system. The stator blade profile of the high-pressure cylinder is a variable cross-section twisted blade, as Figures 2 to 4 shown. Among them:

[0037] The range of the blade inlet angle α of the stator blade in each cross-section is -5° to 5°.

[0038] 0% height direction cross-section: Blade inlet angle α = 5°, the ratio of pitch d to chord length s is 0.6827, the ratio of maximum thickness w to chord length s is 0.25, and the ratio of throat width h to pitch d is 0.3302;

[0039] 5% height direction cross-section: Blade inlet angle α = 4.6°, the ratio of pitch d to chord length s is 0.6871, the ratio of maximum thickness w to chord length s is 0.25, and the ratio of throat width h to pitch d is 0.3328;

[0040] 46% height direction cross-section: Blade inlet angle α = 0.4°, the ratio of pitch d to chord length s is 0.7346, the ratio of maximum thickness w to chord length s is 0.25, and the ratio of throat width h to pitch d is 0.3465;

[0041] 77% height direction cross-section: Blade inlet angle α = -2.7°, the ratio of pitch d to chord length s is 0.7617, the ratio of maximum thickness w to chord length s is 0.25, and the ratio of throat width h to pitch d is 0.3337;

[0042] 92% blade height direction cross-section: blade inlet angle α = -4.2°, ratio of pitch d to chord length s is 0.7713, ratio of maximum thickness w to chord length s is 0.25, ratio of throat width h to pitch d is 0.3217;

[0043] 100% blade height direction cross-section: blade inlet angle α = -5°, ratio of pitch d to chord length s is 0.776, ratio of maximum thickness w to chord length s is 0.25, ratio of throat width h to pitch d is 0.3157.

[0044] Pitch d range of each cross-section of the stator blade is 42.8 mm to 53.4 mm.

[0045] The profile of the moving blade of the 300MW air turbine high-pressure cylinder is a variable cross-section curved and twisted blade, as Figures 5 to 7 shown. Among them:

[0046] Range of blade inlet angle α of the profile of each cross-section of the moving blade is -35° to 40°.

[0047] 0% blade height direction cross-section: blade inlet angle α = -30°, ratio of pitch d to chord length s is 0.6884, ratio of maximum thickness w to chord length s is 0.2941, ratio of throat width h to pitch d is 0.3361;

[0048] 16% blade height direction cross-section: blade inlet angle α = -21.3°, ratio of pitch d to chord length s is 0.704, ratio of maximum thickness w to chord length s is 0.2712, ratio of throat width h to pitch d is 0.3371;

[0049] 47% blade height direction cross-section: blade inlet angle α = -4.4°, ratio of pitch d to chord length s is 0.7208, ratio of maximum thickness w to chord length s is 0.2354, ratio of throat width h to pitch d is 0.3383;

[0050] 77% blade height direction cross-section: blade inlet angle α = 12.6°, ratio of pitch d to chord length s is 0.7307, ratio of maximum thickness w to chord length s is 0.1994, ratio of throat width h to pitch d is 0.3402;

[0051] 95% blade height direction cross-section: blade inlet angle α = 22.2°, ratio of pitch d to chord length s is 0.7253, ratio of maximum thickness w to chord length s is 0.1746, ratio of throat width h to pitch d is 0.3415;

[0052] 100% blade height direction cross-section: blade inlet angle α = 25°, ratio of pitch d to chord length s is 0.7213, ratio of maximum thickness w to chord length s is 0.173, ratio of throat width h to pitch d is 0.3421.

[0053] The pitch d range of each section of the moving blade is 45.4 mm to 56.8 mm.

Claims

1. A high-pressure cylinder of an air energy storage expander based on twisted and bent stationary and moving blades, characterized in that It includes moving blades and stationary blades; The stationary blades are twisted stationary blades. The range of the blade inlet angle α of the cross-sectional profile of the stationary blades is -5° to 5°. Along the blade height direction, it gradually changes from a positive angle to a negative angle, with the angle first gradually decreasing and then gradually increasing, that is, the angle changes from a large angle to a small angle and then from a small angle to a large angle. The range of the cross-sectional pitch d is 42.8 mm to 53.4 mm. The ratio of the cross-sectional pitch d to the chord length s ranges from 0.6827 to 0.776 and gradually increases along the blade height direction. The ratio of the maximum cross-sectional thickness w to the chord length s is 0.

25. The ratio of the cross-sectional throat width h to the pitch d ranges from 0.3157 to 0.3465, and first gradually increases and then gradually decreases along the blade height direction, that is, it changes from small to large and then from large to small; The moving blades are twisted moving blades. The range of the blade inlet angle α of the cross-sectional profile of the moving blades is -35° to 25°. Along the blade height direction, it gradually changes from a negative angle to a positive angle, with the angle first gradually decreasing and then gradually increasing, that is, the angle changes from a large angle to a small angle and then from a small angle to a large angle. The range of the cross-sectional pitch d is 45.4 mm to 56.8 mm. The ratio of the cross-sectional pitch d to the chord length s ranges from 0.6884 to 0.7307 and first gradually increases and then gradually decreases along the blade height direction, that is, it changes from small to large and then from large to small. The range of the ratio of the maximum cross-sectional thickness w to the chord length s is 0.173 to 0.2941 and gradually decreases along the blade height direction. The ratio of the cross-sectional throat width h to the pitch d ranges from 0.3361 to 0.3421 and gradually increases along the blade height direction.

2. The high-pressure cylinder of the air energy storage expander based on the bent and twisted stationary and moving blades according to claim 1, wherein For the stationary blades, the parameters of its cross-sectional profile are as follows: 0% blade height direction cross-section: The blade inlet angle α of the stationary blade is 5°, the ratio of the pitch d to the chord length s is 0.6827, and the ratio of the throat width h to the pitch d is 0.3302; 5% blade height direction cross-section: The blade inlet angle α of the stationary blade is 4.6°, the ratio of the pitch d to the chord length s is 0.6871, and the ratio of the throat width h to the pitch d is 0.3328; 46% blade height direction cross-section: The blade inlet angle α of the stationary blade is 0.4°, the ratio of the pitch d to the chord length s is 0.7346, and the ratio of the throat width h to the pitch d is 0.3465; 77% blade height direction cross-section: The blade inlet angle α of the stationary blade is -2.7°, the ratio of the pitch d to the chord length s is 0.7617, and the ratio of the throat width h to the pitch d is 0.3337; 92% blade height direction cross-section: The blade inlet angle α of the stationary blade is -4.2°, the ratio of the pitch d to the chord length s is 0.7713, and the ratio of the throat width h to the pitch d is 0.3217; 100% blade height direction cross-section: The blade inlet angle α of the stationary blade is -5°, the ratio of the pitch d to the chord length s is 0.776, and the ratio of the throat width h to the pitch d is 0.3157.

3. The high-pressure cylinder of the air energy storage expander based on the bent and twisted stationary and moving blades according to claim 1 or 2, characterized in that For the moving blades, the parameters of its cross-sectional profile are as follows: 0% blade height direction cross-section: The blade inlet angle α of the moving blade is -30°, the ratio of the pitch d to the chord length s is 0.6884, the ratio of the maximum thickness w to the chord length s is 0.2941, and the ratio of the throat width h to the pitch d is 0.3361; 16% blade height cross-section: the inlet angle α of the moving blade is -21.3°, the ratio of pitch d to chord length s is 0.704, the ratio of maximum thickness w to chord length s is 0.2712, and the ratio of throat width h to pitch d is 0.3371; 47% blade height cross-section: the inlet angle α of the moving blade is -4.4°, the ratio of pitch d to chord length s is 0.7208, the ratio of maximum thickness w to chord length s is 0.2354, and the ratio of throat width h to pitch d is 0.3383; 77% blade height cross-section: the inlet angle α of the moving blade is 12.6°, the ratio of pitch d to chord length s is 0.7307, the ratio of maximum thickness w to chord length s is 0.1994, and the ratio of throat width h to pitch d is 0.3402; 95% blade height cross-section: the inlet angle α of the moving blade is 22.2°, the ratio of pitch d to chord length s is 0.7253, the ratio of maximum thickness w to chord length s is 0.1746, and the ratio of throat width h to pitch d is 0.3415; 100% blade height cross-section: the inlet angle α of the moving blade is 25°, the ratio of pitch d to chord length s is 0.7213, the ratio of maximum thickness w to chord length s is 0.173, and the ratio of throat width h to pitch d is 0.3421.

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