Inducer cavitation characteristic prediction method for different fluids, temperatures and rotating speeds
A characteristic prediction and rotational speed technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as flow instability, restricting engine performance and reliability improvement, etc.
Active Publication Date: 2019-09-20
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology
During the development of liquid oxygen kerosene refueling cycle engines in my country, problems caused by cavitation have been encountered many times, such as flow instability induced by cavitation, which has been one of the main excitation sources of engines for a long time, seriously restricting the development of engines in my country. Improved performance and reliability
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[0051] The specific implementation manners of the present invention will be described below in conjunction with the accompanying drawings.
[0052] Cavitation will occur in the working process of the inducer, but the cavitation performance is not the same for the same inducer using different flow media. When the flowing medium is a low-temperature fluid such as liquid oxygen, due to the cavitation thermodynamic effect, the cavitation performance of the induced wheel is improved compared with that of normal temperature water. When the temperature is different, the strength of the cavitation thermodynamic effect of the low temperature medium will also change. In order to obtain the cavitation characteristics of the inducer at different temperatures, this example adopts a method for predicting the cavitation characteristics of the inducer for different fluids, temperatures and rotating speeds, and studies the cavitation thermodynamic effects of the inducer with liquid oxygen as t...
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The invention discloses an inducer cavitation characteristic prediction method for different fluids, temperatures and rotating speeds, and belongs to the technical field of impeller machinery. The implementation method comprises the following steps of correcting on the basis of the traditional cavitation number definition; obtaining the corrected cavitation similar parameters; and selecting a lift coefficient to reduce by a preset value m%, and establishing a relation of cavitation numbers of different working conditions under the condition of the same flow coefficient of the same inducer according to the condition that the cavitation similar parameters are not changed so as to predict the cavitation characteristic under an unknown working condition through a cavitation characteristic curve under a known working condition. According to the method, the unknown cavitation characteristic curve under other working conditions is predicted according to the existing cavitation characteristic curves of the inducer under at least two working conditions, so that the experiment times and the experiment cost of the cavitation characteristic of the inducer can be reduced, and the related engineering problems in the field of the cavitation characteristic of the inducer are solved.
Description
technical field [0001] The invention relates to a numerical prediction method for cavitation of a turbine pump induced wheel for different fluids, temperatures and rotating speeds, and belongs to the technical field of turbomachinery. Background technique [0002] The high-thrust high-pressure liquid oxygen kerosene refueling cycle liquid rocket engine is the main power of my country's new generation of launch vehicles, and it is also one of the main propulsion systems for major space activities such as manned moon landings and deep space exploration in the future. In the development process of the new generation of afterburning cycle engine, the improvement of its performance and reliability puts forward higher requirements for the core component turbopump. High speed and low inlet pressure can effectively increase the power of the turbopump and reduce the pressure of the storage tank, thereby improving the overall efficiency. machine performance. However, it will also mak...
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Login to View More IPC IPC(8): G06F17/50
CPCG06F30/17G06F2119/06G06F2119/08
Inventor 王国玉陈晖樊亚丁梁文栋项乐
Owner BEIJING INSTITUTE OF TECHNOLOGYGY