A self-priming low-reverse blast loss reversing turbine blade and a reversible turbine blade

Abstract

The purpose of the present invention is to provide a self-priming, low-reversal blast loss reversing turbine blade and a reversible turbine blade. The reversing turbine blade includes a blade body and a transition edge plate. The blade body is fixed to the transition edge plate to form the reversing turbine blade body. The reversing turbine blade body and adjacent blades form a cascade channel. High-temperature, high-pressure combustion gas in the cascade channel drives the blade to rotate and output power externally. The blade body is provided with an internal cavity to guide the reversing compressed air to the outside of the blade body. The reversing turbine blade is a reversing turbine blade connected to the forward turbine blade. The present invention can not only meet the core performance requirements of the reversing turbine for normal operation, such as power and efficiency, but also reduce the blast loss of the reversing turbine blade during reverse operation through the fluid self-priming function, reduce the blade weight, and improve the blade stress state. At the same time, it can also cool the blade tip and closed cavity.

Description

Technical Field

[0001] The present invention relates to a turbine, in particular to a moving blade. Background Art

[0002] Since its birth, gas turbines have been favored by various countries due to their high power density and rapid response. Gas turbines have become the main power source for large and medium-sized surface ships.

[0003] At present, the reverse function of marine gas turbines is mainly achieved through variable pitch propellers. The emergence of reversible turbines provides a new way for gas turbine reversing, that is, the gas turbine has the ability to reverse in both forward and reverse directions, and the forward and reverse power are directly provided by the gas turbine.

[0004] The gas turbine's reverse function is achieved through a reversing turbine with forward and reverse rotation capabilities. This type of turbine blades consists of a double layer of blades. Normally, the inner blades are forward turbine blades, and the outer blades are reverse turbine blades. The two layers of blades are connected as one, and are connected to the shaft through a turbine disk to output power. When the entire gas flow passes through the inner blades, the forward turbine blades are in operation, and the reverse turbine blades are reversed; when the entire gas flow passes through the outer blades, the reverse turbine blades are in operation, and the forward turbine blades are reversed. The reversing turbine is in the forward working state for a long time, so the reverse turbine is in the reverse operating state most of the time. At this time, the reverse turbine is in compressor working mode, consuming power, which will cause additional reverse blast losses.

[0005] The traditional turbine blade shape design focuses on how to reduce blade shape loss and improve turbine performance to meet the performance index requirements such as turbine efficiency. However, insufficient attention is paid to the research on the design method of reverse turbine moving blade shape and reducing reverse blast loss. Researchers are eager to have an advanced moving blade that can meet the special working requirements of marine reverse turbines and effectively reduce reverse blast loss, so as to avoid the problem of excessive blast loss caused by excessive pursuit of performance under normal working conditions and ignoring the problem of large blast loss caused by long-term reverse state. Summary of the Invention

[0006] The purpose of the present invention is to provide a self-priming low-reversal blast loss reversing turbine blade and a reversible turbine blade that can solve the problem that the reversing turbine blade of a marine reversible gas turbine is ignored in the design of the reversing turbine blade and is in a reversing state for a long time, thereby causing large blast losses.

[0007] The object of the present invention is achieved like this:

[0008] The present invention provides a self-priming low-reversal blast loss reverse turbine blade, which is characterized by comprising a blade body and a transition edge plate, wherein the blade body is fixed on the transition edge plate to form a reverse turbine blade body, the reverse turbine blade body and adjacent blades form a blade cascade channel, high-temperature and high-pressure combustion gas in the blade cascade channel drives the blade to rotate and output power to the outside, and the blade body is provided with an internal cavity for guiding the reverse compressed air to the outside of the blade body.

[0009] The self-priming low-reversal blast loss reverse turbine rotor blade of the present invention may further include:

[0010] 1. The blade body is a straight blade, that is, the root section blade shape and the top section blade shape of the blade body are the same, and the blade body is obtained by stretching the profile line of a section.

[0011] 2. The surface of the blade body is provided with inclined air inlet holes, which connect the internal cavity with the blade flow channel and guide the reverse compressed air in the blade cascade into the internal cavity.

[0012] 3. An exhaust hole is set at the top of the blade body, which connects the internal cavity with the closed cavity of the cap cover on the top of the moving blade, and discharges the air in the internal cavity into the closed cavity of the cap cover on the top of the moving blade.

[0013] The present invention provides a reversible turbine blade, which is characterized in that it includes a blade body, a transition edge plate, and a forward turbine blade. The blade body is fixed on the transition edge plate to form a reversing turbine blade body. The reversing turbine blade body and adjacent blades form a blade cascade channel. High-temperature and high-pressure combustion gas in the blade cascade channel drives the blade to rotate and output power to the outside. The blade body is provided with an internal cavity for guiding the reverse compressed air to the outside of the blade body; the transition edge plate is connected to the forward turbine blade, and the power generated by the reversing turbine blade body is transmitted through the forward turbine blade.

[0014] The reversible turbine rotor blade of the present invention may further include:

[0015] 1. The blade body is a straight blade, that is, the root section blade shape and the top section blade shape of the blade body are the same, and the blade body is obtained by stretching the profile line of a section.

[0016] 2. The surface of the blade body is provided with inclined air inlet holes, which connect the internal cavity with the blade flow channel and guide the reverse compressed air in the blade cascade into the internal cavity.

[0017] 3. An exhaust hole is set at the top of the blade body, which connects the internal cavity with the closed cavity of the cap cover on the top of the moving blade, and discharges the air in the internal cavity into the closed cavity of the cap cover on the top of the moving blade.

[0018] The advantages of the present invention are:

[0019] 1. While meeting the performance requirements of the reverse turbine, the reverse turbine's reverse blast loss is reduced. Compared to existing methods for controlling reverse turbine blast loss, the reverse turbine rotor blades of the present invention can further reduce blast loss during the reverse turbine's long-term reverse state by more than 5% without changing the reverse turbine's original aerodynamic performance. This improves the efficiency of the reverse turbine during normal operation (the forward turbine operates in the forward state, while the reverse turbine is in reverse), thereby reducing the energy consumption of the reverse turbine and increasing the vessel's endurance.

[0020] 2. The self-priming low-reverse blast loss reversing turbine rotor blades provided by the present invention are targeted at the blast loss of the reversing turbine in the reversing state, combined with existing engineering experience and the internal flow structure characteristics of the reversing turbine in the reversing state, and the rotor blades are improved and adjusted in a targeted manner. This can effectively control the blast loss of the reversing turbine of the marine reversible gas turbine, which is beneficial to improving the performance of the unit when the marine reversible gas turbine is working in the forward direction.

[0021] 3. The self-priming low-reverse blast loss reversing turbine rotor blades provided by the present invention have a hollow structure inside, which is beneficial to reducing the weight of the rotor blades, improving the stress state of the rotor blades, and increasing the life of the reversing turbine rotor blades.

[0022] 4. The self-priming low-reversal blast loss reversing turbine blade provided by the present invention can discharge the air in the reversing turbine blade cascade flow channel to the blade top cap closed cavity, thereby cooling the blade top and the closed cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of the reversible turbine blades of the present invention;

[0024] Figure 2 This is a schematic diagram of the cascade flow passage composed of the blade profile of the reverse turbine rotor blade;

[0025] Figure 3 This is a schematic diagram of the appearance of the reversing turbine rotor blade;

[0026] Figure 4 This is a schematic diagram of the structure of the self-priming low-reverse blast loss reverse turbine rotor blades of the present invention;

[0027] Figure 5 A schematic cross-sectional view of the self-priming low-reverse blast loss reverse turbine rotor blade of the present invention;

[0028] Figure 6 This is a schematic diagram of the cavity of the reversing turbine blade tip and cap structure;

[0029] Figure 7 Schematic diagram of the internal streamlines when the reversing turbine blades reverse. DETAILED DESCRIPTION

[0030] The present invention will be described in more detail below with reference to the accompanying drawings:

[0031] Combine Figure 1-7 , Specific implementation method 1: Combined Figure 1 、 Figure 2 The present embodiment is described as follows. A self-priming, low-reversal blast loss reversing turbine blade 1 is provided in the present embodiment. It is a part of a reversing turbine blade and includes a blade body 1-1 and a transition edge plate 1-2. The reversing turbine blade 1 and the adjacent blades 2 form a reversing turbine blade channel. High-temperature and high-pressure combustion gas in the blade channel drives the blade to rotate and output power to the outside.

[0032] Specific implementation method 2: Combination Figure 1 To illustrate this embodiment, the blade body 1-1, the transition edge plate 1-2, and the reversing turbine forward blade 3 of the self-priming low-reversal blast loss reversing turbine rotor blade 1 of this embodiment are sequentially connected into one body to form the entire reversing turbine rotor blade. The power generated by the reversing turbine rotor blade 1 is transmitted through the forward turbine rotor blade 3.

[0033] Other components and connection relationships are the same as those in the first embodiment.

[0034] Specific implementation method three: Combination Figure 3 To illustrate this embodiment, the self-priming low-reversal blast loss reversing turbine blade 1 of this embodiment is a straight blade, that is, the root section blade shape and the top section blade shape of the reversing turbine blade are the same, and the blade is obtained by stretching the profile line of a section. Compared with the twisted blade, this arrangement can simplify the reversing turbine blade structure, which is beneficial to the production, processing and inspection of the reversing turbine blade.

[0035] Other components and connection relationships are the same as those in the first or second embodiment.

[0036] Specific implementation method four: Combination Figure 4 、 Figure 5 To describe this embodiment, the self-priming low-reversal blast loss reversing turbine blades of this embodiment are provided with an internal cavity 4, which is used to guide the reversing compressed air to the outside of the blades on the one hand, and on the other hand, compared with traditional solid reversing turbine blades, it is also beneficial to reduce the weight of the blades, improve the stress state of the blades, and increase the life of the reversing turbine blades.

[0037] Other components and connection relationships are the same as those in the first, second or third embodiment.

[0038] Specific implementation method five: Combination Figure 4 、 Figure 5To describe this embodiment, the self-priming low-reversal blast loss reversing turbine rotor blade of this embodiment has a plurality of rows of inclined air inlet holes 5 on the rotor blade surface. These air inlet holes 5 connect the internal cavity 4 of the rotor blade with the blade cascade flow channel, and are used to guide the reverse compressed air in the reversing turbine rotor blade cascade into the internal cavity 4 of the rotor blade, thereby reducing the amount of reverse compressed air and thus reducing the reversal blast loss.

[0039] Other components and connection relationships are the same as those in the first, second, third or fourth embodiment.

[0040] Specific implementation method six: combination Figures 4 to 6 To describe this embodiment, the self-priming low-reversal blast loss reversing turbine blade of this embodiment has a plurality of exhaust holes 6 on the top of the blade. These exhaust holes 6 connect the internal cavity 4 of the blade with the closed cavity 7 of the cap on the top of the blade, and are used to discharge the air in the internal cavity 4 of the reversing turbine blade to the closed cavity 7 of the cap on the top of the blade, and at the same time play a role in cooling the blade top 8 and the closed cavity 7.

[0041] Other components and connection relationships are the same as those in the first, second, third, fourth or fifth embodiment.

[0042] pass Figures 1 to 7 Explain how it works:

[0043] The blade body 1-1, the transfer edge plate 1-2, and the reversing turbine forward blade 3 of the reversing turbine rotor blade 1 are sequentially connected into one body to form the entire reversing turbine rotor blade. The reversing turbine rotor blade 1 and the adjacent blade 2 form a reversing turbine blade cascade channel. When the reversing turbine is working normally, that is, when the reversing turbine rotor blade 1 rotates forward, the high-temperature and high-pressure combustion gas is expanded and accelerated inside the reversing turbine stage guide vane, and then rushes into the reversing turbine blade cascade channel formed by the reversing turbine rotor blade 1 and the adjacent blade 2 at a higher speed. The high-temperature and high-pressure combustion gas pushes the reversing turbine in the blade cascade channel. The rotor blades 1 rotate, and the power generated by the reverse turbine rotor blades 1 is transmitted through the forward turbine rotor blades 3. When the forward turbine is working, the reverse turbine rotor blades 1 rotate in the opposite direction, that is, the reverse turbine rotates in the reverse direction. In this case, the reverse turbine enters the compressor working mode, that is, the airflow flows in the reverse direction, from the original outlet to the inlet side, and the air is compressed. That is, the exhaust gas of the forward turbine is sucked into the blade channel formed by the reverse turbine rotor blades 1 and the adjacent blades 2. At this time, the reverse turbine is in a reverse power consumption state, not only does it not generate power, but it consumes power. The reverse turbine rotor blade with self-priming function and low reverse blast loss of the present invention is provided with an air inlet hole 5 on the blade surface, an internal cavity 4 of the rotor blade, and an exhaust hole 6 on the top, so that the reverse compressed air in the reverse turbine rotor blade cascade is guided into the internal cavity of the rotor blade, reducing the amount of reverse compressed air, thereby reducing the reverse blast loss. In this way, the core index requirements of power, efficiency, etc. for the normal operation of the reversing turbine can be met, and the self-priming function of the fluid can be used to reduce the blast loss of the reversing turbine blades during the reverse operation, thereby solving the problem of large blast loss caused by ignoring the long-term reversing state of the reversing turbine blades of the marine reversible gas turbine during design. At the same time, since the interior of the blade is a hollow structure, it is beneficial to reduce the weight of the blade, improve the stress state of the blade, and increase the service life of the reversing turbine blade, and also cool the blade tip and the closed cavity.

[0044] In summary, the present invention relates to a reversing turbine blade that can meet the core index requirements of power, efficiency, etc. for normal operation of the reversing turbine, and can reduce the blast loss during the reversing operation of the reversing turbine blade through the self-priming function of the fluid. The purpose of the present invention is to solve the problem of excessive blast loss caused by ignoring the fact that the reversing turbine blade of a marine reversible gas turbine is in a reversing state for a long time during design, and further provide a reversing turbine blade with low reversing blast loss and self-priming function that is suitable for the reversing turbine of a marine reversible gas turbine. The present invention is used to improve the field of reversing blast loss control and blade weight reduction of the reversing turbine blade of a marine reversible gas turbine.

Claims

1. A self-priming low-reverse blast loss reversing turbine rotor blade, characterized by: It includes a blade body and a transition edge plate. The blade body is fixed on the transition edge plate to form a reverse turbine rotor blade body. The reverse turbine rotor blade body and adjacent blades form a cascade channel. High-temperature and high-pressure combustion gas in the cascade channel drives the blade to rotate and output power to the outside. The blade body is provided with an internal cavity to guide the reverse compressed air to the outside of the blade body. The surface of the blade body is provided with inclined air inlet holes, which connect the internal cavity with the blade cascade flow channel and guide the reverse compressed air in the blade cascade into the internal cavity.

2. The self-priming low-reverse blast loss reverse turbine rotor blade according to claim 1, characterized in that: The blade body is a straight blade, that is, the root section blade shape and the top section blade shape of the blade body are the same, and the blade body is obtained by stretching the profile line of a section.

3. The self-priming low-reversal blast loss reverse turbine rotor blade according to claim 1, characterized in that: An exhaust hole is provided at the top of the blade body, which connects the internal cavity with the closed cavity of the cap cover at the top of the moving blade, and discharges the air in the internal cavity into the closed cavity of the cap cover at the top of the moving blade.

4. Reversible turbine blades, characterized by: It includes a blade body, a transition edge plate, and a forward turbine blade. The blade body is fixed to the transition edge plate to form a reverse turbine blade body. The reverse turbine blade body and adjacent blades form a cascade channel. High-temperature and high-pressure combustion gas in the cascade channel drives the blade to rotate and output power to the outside. The blade body is provided with an internal cavity to guide the reverse compressed air to the outside of the blade body; the transition edge plate is connected to the forward turbine blade, and the power generated by the reverse turbine blade body is transmitted through the forward turbine blade. The surface of the blade body is provided with inclined air inlet holes, which connect the internal cavity with the blade cascade flow channel and guide the reverse compressed air in the blade cascade into the internal cavity.

5. The reversible turbine rotor blade according to claim 4, characterized in that: The blade body is a straight blade, that is, the root section blade shape and the top section blade shape of the blade body are the same, and the blade body is obtained by stretching the profile line of a section.

6. The reversible turbine rotor blade according to claim 4, characterized in that: An exhaust hole is provided at the top of the blade body, which connects the internal cavity with the closed cavity of the cap cover at the top of the moving blade, and discharges the air in the internal cavity into the closed cavity of the cap cover at the top of the moving blade.

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