Dynamic stability enhancement method of centrifugal compressor
A centrifugal compressor, dynamic technology, applied in the direction of machines/engines, mechanical equipment, liquid fuel engines, etc., can solve the problems of low pressure ratio working area, such as insignificant and difficult expansion of stability, to expand the range of stable working flow, The effect of improving performance
Active Publication Date: 2020-03-17
TSINGHUA UNIV
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Problems solved by technology
The self-circulating casing treatment method has a better stability expansion effect on the high-speed and high-pressure ratio working area of the centrifugal compressor, but the expansion effect on the low-pressure ratio working area is not obvious, and it is difficult to achieve expansion stability in the full pressure ratio working range
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[0019] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0020] The dynamic stability expansion method for a centrifugal compressor provided by the invention is mainly applicable to a centrifugal compressor driven by a motor. The motor is connected to the centrifugal compressor through its main shaft, and drives the impeller of the centrifugal compressor to rotate at a certain speed. The motor controller controls the speed and torque of the motor, thereby realizing the control of the centrifugal compressor. The mass flow sensor is placed in the inlet pipe of the centrifugal compressor and is used to measure the mass flow of air currently flowing through ...
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The invention relates to a dynamic stability enhancement method of a centrifugal compressor. The method comprises the following steps that when the flow demand of the centrifugal compressor changes, the current flow in an inlet pipeline of the centrifugal compressor and the current rotating speed of a motor connected with the centrifugal compressor and driving the impeller of the centrifugal compressor to rotate are measured in real time; the position of the current working point of the centrifugal compressor on the performance curve of the centrifugal compressor is judged according to the current flow and the current rotating speed; if the position is close to or at the control starting point on the performance curve of the centrifugal compressor, a motor controller controls the motor tooperate at the dynamic rotating speed with the current rotating speed as the average rotating speed, and the compressor is converted from a steady-state working state to a dynamic working state. According to the method, the stable working flow range of the centrifugal compressor can be expanded, the stability expansion can be realized in all working areas from a low pressure ratio to a high pressure ratio, the pressure ratio in a small flow area can be improved while the stability expansion effect is realized, and the performance of the system is improved.
Description
technical field [0001] The invention relates to the technical field of impeller machinery, in particular to a method for dynamically expanding and stabilizing a centrifugal compressor. Background technique [0002] Centrifugal compressors have the advantages of small size, light weight, high efficiency, low noise, and stable operation. They are widely used in automotive, aviation, and ship power systems, as well as industrial gas compression and delivery systems. The operating flow range of the centrifugal compressor is limited by the surge line and the plug line. Under the condition of small flow rate, large-scale flow separation occurs inside the centrifugal compressor, and flow instability occurs, which leads to compressor blade stall and surge. Through the flow control of the centrifugal compressor, the main way to broaden the stable working flow range of the centrifugal compressor is to suppress the blade stall in the small flow condition. [0003] At present, the sta...
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IPC IPC(8): F04D25/08F04D27/02F04D29/44F04D29/66
CPCF04D25/08F04D27/0261F04D29/441F04D29/667
Inventor 诸葛伟林陈昊翔张扬军
Owner TSINGHUA UNIV