CN114781077A - Stage load matching design method for high-performance low-pressure compressor of marine gas turbine - Google Patents

Stage load matching design method for high-performance low-pressure compressor of marine gas turbine Download PDF

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CN114781077A
CN114781077A CN202210201044.5A CN202210201044A CN114781077A CN 114781077 A CN114781077 A CN 114781077A CN 202210201044 A CN202210201044 A CN 202210201044A CN 114781077 A CN114781077 A CN 114781077A
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stage
load
compressor
pressure compressor
gas turbine
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王�琦
肖舒宁
张舟
汪作心
洪青松
王慧杰
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703th Research Institute of CSIC
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Abstract

The invention aims to provide a high-performance low-pressure compressor stage load matching design method for a marine gas turbine. According to the invention, through the specific distribution rule design of key control parameters, the customized matching of the loads of all stages in the low-pressure compressor is realized, the design precision is improved, and the design period is shortened. Meanwhile, the invention is not limited to the low-pressure compressor of the marine gas turbine, and is also suitable for the pneumatic design process of various high-efficiency and wide-margin axial flow compressors.

Description

Stage load matching design method for high-performance low-pressure compressor of marine gas turbine
Technical Field
The invention relates to a control method of a gas turbine, in particular to a control method of a compressor.
Background
The performance of the compressor directly influences whether the technical index and the economic index of the marine gas turbine can be realized according to design expectation. With the continuous promotion of key performance indexes such as efficiency, power, stability and the like of the marine gas turbine, extremely high requirements are provided for the design of gas compressor components: on one hand, the level of the grade load is improved, and on the other hand, the long-term efficient stable operation is ensured in a wide working condition range. Particularly for low-pressure compressors, high efficiency and wide margin have become the core of the performance development of the low-pressure compressors. However, the internal flow mechanism of the multistage axial-flow compressor is very complex, so that the pneumatic design difficulty of the high-efficiency wide-margin low-pressure compressor is very high. Research shows that the key point of the pneumatic design of the high-performance low-pressure compressor lies in reasonably distributing the space load inside the compressor and fully exerting the compression capacity of each stage of the compressor under different working conditions.
Disclosure of Invention
The invention aims to provide a load matching design method for high-performance low-pressure compressor stages of a marine gas turbine, which can solve the problem of load matching difficulty among the high-performance low-pressure compressor stages of the marine gas turbine.
The purpose of the invention is realized as follows:
the invention relates to a high-performance low-pressure compressor stage load matching design method of a marine gas turbine, which is characterized by comprising the following steps of:
(1) determining design parameters of the compressor, including inlet conditions, rotating speed, flow, pressure ratio, stage number, outer diameter of a first-stage movable blade and hub ratio of the compressor;
(2) selecting a stage load control parameter, adopting a load coefficient psi as the stage load control parameter, and controlling the load matching among stages by controlling the load coefficients of all stages;
(3) designing a gradual distribution rule of the load coefficient psi, and giving a relation between the load coefficient psi and a step serial number z;
(4) and solving the one-dimensional inverse problem, namely taking the compressor design parameters and the load coefficient step-by-step distribution results obtained in the steps as input variables, and performing the solving of the one-dimensional inverse problem to obtain a matching design scheme of each stage of load of the low-pressure compressor.
The present invention may further comprise:
1. the given relationship between the load factor ψ and the stage number z described in step (3) is as follows:
determining a first-stage load coefficient psi according to the rotating speed and pressure ratio of the gas compressor and the outer diameter of the first-stage movable blades1(ii) a Then determining the load coefficient psi of each stage by the following relational expressionz：
Figure BDA0003527448160000021
The invention has the advantages that:
1. according to the invention, the customized matching design of the loads of all stages in the low-pressure compressor is realized by controlling the step-by-step distribution rule of the load coefficients, the problem of difficult load matching among all stages of the high-performance low-pressure compressor of the marine gas turbine is effectively solved, and the performance of the low-pressure compressor of the marine gas turbine is effectively improved.
2. The invention can realize the fine design of the pneumatic scheme of the low-pressure compressor of the marine gas turbine, effectively improve the pneumatic design precision of the low-pressure compressor of the marine gas turbine and shorten the design period.
3. The invention is not limited to the low-pressure compressor of the marine gas turbine, but also is suitable for the pneumatic design process of various high-efficiency and wide-margin axial flow compressors.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The invention is described in more detail below by way of example with reference to the accompanying drawings:
with reference to fig. 1, the specific embodiment of the high-performance low-pressure compressor stage load matching design method of the marine gas turbine according to the present invention is implemented by the following steps:
the method comprises the following steps: and determining design parameters of the compressor. Determining design parameters of the low-pressure compressor according to the overall index requirement, wherein the design parameters comprise inlet conditions, rotating speed, flow, pressure ratio, stage number, first-stage movable blade outer diameter and hub ratio and the like of the compressor;
step two: a level load control parameter is selected. And the load coefficient psi is used as a stage load control parameter, and the load matching among stages is controlled by controlling the load coefficients of all stages.
The load factor ψ is defined as follows:
Figure BDA0003527448160000031
wherein C1u,m、C2u,mIs the absolute tangential velocity U of the average radius of the inlet and the outlet of each stage of movable blade of the gas compressorkThe circumferential speed at the blade top of the inlet of each stage of movable blade of the compressor.
Step three: and designing the gradual distribution rule of the load coefficient psi.
The relationship between the given load factor ψ and the stage number z is as follows:
determining a first-stage load coefficient psi according to the rotating speed and the pressure ratio of the gas compressor and the outer diameter of the first-stage movable blades1(ii) a Then determining the load coefficient psi of each stage by the following relational expressionz：
Figure BDA0003527448160000032
Step four: and solving a one-dimensional inverse problem. And taking the compressor design parameters and the load coefficient step-by-step distribution results obtained in the steps as input variables, and performing one-dimensional inverse problem solving to obtain a matching design scheme of each stage of loads of the low-pressure compressor.
The high-performance low-pressure compressor stage load matching design method of the marine gas turbine has universality, is not limited to the low-pressure compressor of the marine gas turbine, and is also suitable for the pneumatic design process of various high-efficiency wide-margin axial flow compressors.

Claims (2)

1. A stage load matching design method for a high-performance low-pressure compressor of a marine gas turbine is characterized by comprising the following steps:
(1) determining design parameters of the compressor, including inlet conditions, rotating speed, flow, pressure ratio, stage number, outer diameter of a first-stage movable blade and hub ratio of the compressor;
(2) selecting a stage load control parameter, adopting a load coefficient psi as the stage load control parameter, and controlling load matching among stages by controlling the load coefficients of all stages;
(3) designing a gradual distribution rule of the load coefficient psi, and giving a relation between the load coefficient psi and a step sequence number z;
(4) and (3) solving the one-dimensional inverse problem, namely, taking the compressor design parameters and the load coefficient step-by-step distribution results obtained in the steps as input variables, and performing the one-dimensional inverse problem solving to obtain a matching design scheme of each stage of loads of the low-pressure compressor.
2. The design method for matching the stage load of the high-performance low-pressure compressor of the marine gas turbine as claimed in claim 1, wherein the design method comprises the following steps: the given relationship between the load factor ψ and the stage number z described in step (3) is as follows:
determining a first-stage load coefficient psi according to the rotating speed and pressure ratio of the gas compressor and the outer diameter of the first-stage movable blades1(ii) a Then, the load factor psi at each stage is determined by the following relational expressionz：
Figure FDA0003527448150000011
CN202210201044.5A 2022-03-02 2022-03-02 Stage load matching design method for high-performance low-pressure compressor of marine gas turbine Pending CN114781077A (en)

Priority Applications (1)

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CN202210201044.5A CN114781077A (en) 2022-03-02 2022-03-02 Stage load matching design method for high-performance low-pressure compressor of marine gas turbine

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CN202210201044.5A CN114781077A (en) 2022-03-02 2022-03-02 Stage load matching design method for high-performance low-pressure compressor of marine gas turbine

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CN114781077A true CN114781077A (en) 2022-07-22

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