A method for aerodynamic design of a marine reverse turbine

Abstract

The purpose of the present invention is to provide an aerodynamic design method for a marine reverse turbine, comprising the following steps: determining the design requirements and parameters for the reverse turbine; completing the one-dimensional aerodynamic design of the reverse turbine; completing the shaping of the guide vanes and moving blades of the reverse turbine; performing a three-dimensional analysis of the reverse turbine under normal operating conditions; and calculating the power consumption of the reverse turbine under reverse operating conditions. The present invention reorganizes the aerodynamic design process for a marine reverse turbine, focusing on adding a step for evaluating the blast loss under the reverse turbine under reverse operating conditions. This improves the aerodynamic design process for the reverse turbine, avoids excessive pursuit of performance under normal operating conditions while ignoring the problem of excessive blast loss caused by prolonged reverse operating conditions, avoids design iterations, and accelerates the aerodynamic design process for the reverse turbine. At the same time, a targeted analysis of the blast loss under the reverse turbine under reverse operating conditions is provided, enabling rapid and effective control of the blast loss of the reverse turbine of a marine reversible gas turbine.

Description

Technical Field

[0001] The present invention relates to a gas turbine aerodynamic design method, in particular to a marine turbine aerodynamic design method. 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 reverse function of a gas turbine is achieved through a reversing turbine with forward and reversible rotation capabilities. This turbine blade consists of a double layer of blades. Typically, the inner blades are the forward turbine blades, and the outer blades are the reverse turbine blades. The two blades are connected as a whole and connected to the shaft through a turbine disk to output power. When the gas flow flows entirely through the inner blades, the forward turbine blades are activated, and the reverse turbine blades are reversed. When the gas flow flows entirely through the outer blades, the reverse turbine blades are activated, and the forward turbine blades are reversed.

[0005] Traditional turbine aerodynamic design focuses on how to improve turbine performance to meet performance index requirements, but pays insufficient attention to the aerodynamic design methods of reverse turbines. Researchers are eager to have an advanced aerodynamic design method that can meet the special working requirements of marine reverse turbines, so as to avoid the problem of excessive pursuit of performance under normal working conditions and ignoring the problem of large blast losses caused by long-term reversal state. Summary of the Invention

[0006] The purpose of the present invention is to provide a method for aerodynamic design of a reversing turbine of a marine gas turbine, which can solve the problem that the reversing turbine of the marine gas turbine is in a reversing state for a long time during the aerodynamic design, thereby causing large blast losses.

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

[0008] The present invention provides a method for aerodynamic design of a marine reverse turbine, which is characterized by:

[0009] (1) Determine the design requirements and parameters of the reverse turbine;

[0010] (2) Complete the one-dimensional aerodynamic design of the reverse turbine;

[0011] (3) Complete the shape of the reverse turbine guide vanes and moving blades;

[0012] (4) Perform three-dimensional analysis of the reverse turbine under normal working conditions;

[0013] (5) Calculate the power consumption when the turbine is in reverse rotation.

[0014] The present invention may also include:

[0015] 1. Step (1) The reverse turbine design requirements and parameters include: determining the reverse turbine design input parameters according to the working requirements and overall performance parameters of the marine reversible gas turbine, including the inlet total temperature, inlet total pressure, inlet flow, expansion ratio, speed design input parameters under the normal working state of the reverse turbine, as well as the flow root size limit, and determining the minimum required values of the reverse turbine power and efficiency; and the inlet total temperature, inlet total pressure, inlet flow, expansion ratio, speed design input parameters under the reverse working state of the reverse turbine, as well as the power consumption requirement, that is, the reverse blast loss control value.

[0016] 2. Step (2) of the one-dimensional aerodynamic design of the reversing turbine is specifically as follows: according to the given reversing turbine design input parameters, a one-dimensional design calculation program is used to adjust the flow size, blade height, blade inlet airflow angle, outlet airflow angle, and reaction degree design parameters to obtain the one-dimensional aerodynamic parameters and flow of the reversing turbine that meet the power and efficiency requirements, thereby completing the one-dimensional aerodynamic design of the reversing turbine.

[0017] 3. Step (3) of the reversing turbine guide vane and moving blade shaping is specifically as follows: based on the one-dimensional aerodynamic parameters of the reversing turbine obtained in step (2), the inlet geometric angle, outlet geometric angle, installation angle, axial chord length, leading edge radius, trailing edge radius, front wedge angle, and rear wedge angle parameters of the reversing turbine guide vane and moving blade are given, and a turbine blade three-dimensional shaping program is used to complete the reversing turbine guide vane and moving blade shaping.

[0018] 4. Step (4) The three-dimensional analysis of the reverse turbine under normal working conditions is specifically as follows: using a full three-dimensional fluid mechanics calculation program, analyzing the aerodynamic performance of the reverse turbine under normal working conditions, and judging whether the power and efficiency of the reverse turbine meet the design index requirements under the normal working state design input conditions given in step (1). If the requirements are met, proceed to step (5); if not, repeat steps (2) to (4) until the index requirements are met.

[0019] 5. Step (5) calculates the power consumption of the reverse turbine in the reverse state as follows: using a full three-dimensional fluid mechanics calculation program, analyzing the aerodynamic performance of the reverse turbine in the reverse working state, judging whether the power consumption requirement of the reverse turbine meets the design index requirements under the reverse working state design input conditions given in step (1), that is, whether the reverse turbine reverse blast loss control value meets the design index requirements. If it meets the requirements, the design process ends. If it does not meet the requirements, adjustments are made and the reason for the large reverse blast loss of the reverse turbine is analyzed. If the large reverse blast loss of the reverse turbine is caused by the high blade height, the reverse turbine flow size and blade height are adjusted, and steps (2) to (5) are repeated until the index requirements are met. If the large reverse blast loss of the reverse turbine is caused by the excessive turning angle of the reverse turbine rotor blade, the parameters such as the outlet geometric angle, installation angle, and chord length of the reverse turbine rotor blade are adjusted, and steps (3) to (5) are repeated until the index requirements are met.

[0020] 6. The reverse turbine reverse power consumption described in step (5) is as follows:

[0021] Among them, P R is the reverse turbine power consumption, N is the reverse turbine speed, p i is the pressure of the i-th grid node on the surface of the reversing turbine blade during three-dimensional calculation, A i is the i-th grid area of the reverse turbine blade surface during three-dimensional calculation, L i is the distance from the center of the i-th grid on the surface of the reversing turbine rotor blade to the rotation axis during three-dimensional calculation, and n is the total number of grids on the surface of the reversing turbine rotor blade during three-dimensional calculation.

[0022] The advantages of the present invention are:

[0023] 1. Based on the full utilization of conventional turbine aerodynamic design calculation methods and processes, the present invention reorganizes the aerodynamic design process for marine reversing turbines according to the working characteristics of the reversing turbine of a reversible gas turbine, and focuses on adding a step of evaluating the blast loss under the reversing state of the reversing turbine, thereby improving the reversing turbine aerodynamic design process. This avoids the problem of excessive blast loss caused by excessive pursuit of performance under normal working conditions while ignoring the long-term reversing state, thus avoiding design iterations and accelerating the reversing turbine aerodynamic design process.

[0024] 2. The present invention specifically analyzes the blast loss of the reversing turbine in the reverse state and optimizes and adjusts it, which can achieve rapid and effective control of 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1is a flow chart of the present invention;

[0026] Figure 2a This is a schematic diagram of the forward turbine of a reversible gas turbine. Figure 2b A schematic diagram of a reversing turbine of a reversible gas turbine is provided;

[0027] Figure 3 This is a schematic diagram of the reverse turbine in normal working state;

[0028] Figure 4 This is a schematic diagram of the reverse turbine in reverse working state;

[0029] Figure 5 This is a schematic diagram of the reverse turbine flow size;

[0030] Figure 6 Schematic diagram of reverse turbine blade parameters. DETAILED DESCRIPTION

[0031] The present invention will be described in more detail below with reference to the accompanying drawings:

[0032] Combine Figure 1-6 A specific implementation of a marine reverse turbine aerodynamic design is achieved by the following steps:

[0033] Step 1: Determine the design requirements and parameters of the reverse turbine. According to the working requirements and overall performance parameters of the marine reversible gas turbine, determine the design requirements and parameters of the reverse turbine (such as Figure 2a 、 Figure 2b As shown) design input parameters, including the normal working state of the reverse turbine (such as Figure 3 The design input parameters such as inlet total temperature, inlet total pressure, inlet flow, expansion ratio, speed, etc., as well as the flow root size limit, are determined, and the minimum required values of reverse turbine power and efficiency are determined; and the reverse turbine reverse working state (such as Figure 4 The design input parameters include inlet total temperature, inlet total pressure, inlet flow, expansion ratio, speed, etc., as well as power consumption requirements, that is, the reverse blast loss control value.

[0034] Step 2: One-dimensional aerodynamic design of reverse turbine. According to the given input parameters of reverse turbine design, use one-dimensional design calculation program to adjust the flow size and blade height (such as Figure 5 As shown in the figure), the blade inlet flow angle, outlet flow angle, reaction degree and other design parameters are obtained to obtain the one-dimensional aerodynamic parameters and flow rate of the reverse turbine that meet the power and efficiency requirements (as shown in the figure). Figure 5 As shown in Figure 3), the one-dimensional aerodynamic design of the reverse turbine is completed.

[0035] Step 3: Reverse turbine guide vane and moving blade shaping. According to the one-dimensional aerodynamic parameters of the reverse turbine obtained in step 2, the blade parameters such as the inlet geometric angle, outlet geometric angle, installation angle, axial chord length, leading edge radius, trailing edge radius, front wedge angle, and rear wedge angle of the reverse turbine guide vane and moving blade are given (such as Figure 6 As shown in the figure), the turbine blade 3D modeling program is used to complete the modeling of the reverse turbine guide vanes and moving blades.

[0036] Step 4: 3D analysis of the reverse turbine under normal working conditions. Use the full 3D fluid mechanics calculation program to analyze the normal working conditions of the reverse turbine (such as Figure 3 The aerodynamic performance of the reverse turbine is judged under the normal working state design input conditions given in step 1, whether the power and efficiency meet the design index requirements. If they meet the requirements, go to step 5. If they do not meet the requirements, repeat steps 2 to 4 until the index requirements are met.

[0037] Step 5: Calculation of power consumption of reverse turbine in reverse state. Using full three-dimensional fluid dynamics calculation program, analyze the aerodynamic performance of reverse turbine in reverse working state, and judge the reverse turbine in the given reverse working state in step 1 (such as Figure 4 Under the design input conditions shown in the figure, the reverse turbine reverse power consumption P R It is required to check whether the design index requirements are met, that is, whether the reverse turbine reverse blast loss control value meets the design index requirements. If the requirements are met, the design process ends. If the requirements are not met, adjustments need to be made and the reasons for the large reverse turbine reverse blast loss should be analyzed. If the reverse turbine reverse blast loss is large due to the high blade height, adjust the reverse turbine flow size and blade height, and repeat steps 2 to 5 until the index requirements are met; if the reverse turbine reverse blast loss is large due to the excessive turning angle of the reverse turbine rotor blade, adjust the reverse turbine rotor blade outlet geometry angle, installation angle, chord length and other parameters, and repeat steps 3 to 5 until the index requirements are met. Reverse turbine reverse power consumption P R The definition is as follows:

[0038] Where N is the reverse turbine reverse speed, p i is the pressure of the i-th grid node on the surface of the reversing turbine blade during three-dimensional calculation, A i is the i-th grid area of the reverse turbine blade surface during three-dimensional calculation, L i is the distance from the center of the i-th grid on the surface of the reversing turbine rotor blade to the rotation axis during three-dimensional calculation, and n is the total number of grids on the surface of the reversing turbine rotor blade during three-dimensional calculation.

[0039] The aerodynamic design method for a marine reversing turbine proposed in the present invention is universal and is not limited to the reversing turbine of a marine reversible gas turbine, but is also applicable to the drag and reversal loss assessment process of a marine conventional gas turbine power turbine.

Claims

1. A method for aerodynamic design of a marine reverse turbine, characterized by: (1) Determine the design requirements and parameters of the reverse turbine; The reverse turbine design requirements and parameters include: determining the reverse turbine design input parameters based on the operating requirements and overall performance parameters of the marine reversible gas turbine, including the inlet total temperature, inlet total pressure, inlet flow rate, expansion ratio, speed design input parameters under the normal operating state of the reverse turbine, as well as the flow root size limit, and determining the minimum required values of the reverse turbine power and efficiency; and determining the inlet total temperature, inlet total pressure, inlet flow rate, expansion ratio, speed design input parameters under the reverse turbine reverse operating state, as well as the power consumption requirements, that is, the reverse blast loss control value; (2) Complete the one-dimensional aerodynamic design of the reverse turbine; (3) Complete the shape of the reverse turbine guide vanes and moving blades; (4) Perform three-dimensional analysis of the reverse turbine under normal working conditions; (5) Calculate the power consumption of the reverse turbine in reverse state; Step (5) calculates the power consumption of the reverse turbine in the reverse state as follows: using a full three-dimensional fluid mechanics calculation program, analyzing the aerodynamic performance of the reverse turbine in the reverse working state, judging whether the power consumption requirement of the reverse turbine meets the design index requirements under the reverse working state design input conditions given in step (1), that is, whether the reverse turbine reverse blast loss control value meets the design index requirements; if it meets the requirements, the design process ends; if it does not meet the requirements, adjustments are made, and the reason why the reverse turbine reverse blast loss is too large is analyzed; if the reverse turbine reverse blast loss is too large due to the high blade height, the reverse turbine flow size and blade height are adjusted, and steps (2) to (5) are repeated until the index requirements are met; if the reverse turbine reverse blast loss is too large due to the excessive turning angle of the reverse turbine blade, the reverse turbine blade outlet geometric angle, installation angle, and chord length parameters are adjusted, and steps (3) to (5) are repeated until the index requirements are met.

2. The aerodynamic design method for a marine reverse turbine according to claim 1, characterized in that: Step (2) of the one-dimensional aerodynamic design of the reversing turbine is specifically as follows: according to the given reversing turbine design input parameters, a one-dimensional design calculation program is used to adjust the flow size, blade height, blade inlet airflow angle, outlet airflow angle, and reaction degree design parameters to obtain the one-dimensional aerodynamic parameters and flow of the reversing turbine that meet the power and efficiency requirements, thereby completing the one-dimensional aerodynamic design of the reversing turbine.

3. The aerodynamic design method for a marine reverse turbine according to claim 1, characterized in that: Step (3) of the reversing turbine guide vane and moving blade shaping is specifically as follows: according to the one-dimensional aerodynamic parameters of the reversing turbine obtained in step (2), the inlet geometric angle, outlet geometric angle, installation angle, axial chord length, leading edge radius, trailing edge radius, front wedge angle, and rear wedge angle parameters of the reversing turbine guide vane and moving blade are given, and the turbine blade three-dimensional shaping program is used to complete the reversing turbine guide vane and moving blade shaping.

4. The aerodynamic design method for a marine reverse turbine according to claim 1, characterized in that: Step (4) three-dimensional analysis of the reverse turbine under normal working conditions is specifically as follows: using a full three-dimensional fluid mechanics calculation program to analyze the aerodynamic performance of the reverse turbine under normal working conditions, and judging whether the power and efficiency of the reverse turbine meet the design index requirements under the normal working state design input conditions given in step (1); if they meet the requirements, proceed to step (5); if they do not meet the requirements, repeat steps (2) to (4) until the index requirements are met.

5. The aerodynamic design method for a marine reverse turbine according to claim 1, characterized in that: The reverse turbine reverse power consumption in step (5) is as follows: Among them, P R is the reverse turbine power consumption, N is the reverse turbine speed, p i is the pressure of the i-th grid node on the surface of the reversing turbine blade during three-dimensional calculation, A i is the i-th grid area of the reverse turbine blade surface during three-dimensional calculation, L i is the distance from the center of the i-th grid on the surface of the reversing turbine rotor blade to the rotation axis during three-dimensional calculation, and n is the total number of grids on the surface of the reversing turbine rotor blade during three-dimensional calculation.

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