Prediction method of induced wheel cavitation characteristics for different fluids, temperatures and rotational speeds
A technology for predicting characteristics and rotating speed, applied in the field of turbomachinery, can solve the problems of unstable flow, restricting the improvement of engine performance and reliability, etc.
Active Publication Date: 2021-01-15
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 speeds, and studies the cavitation thermodynamic effects of the inducer with liquid oxygen as the medium...
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The invention discloses a method for predicting cavitation characteristics of an inducer for different fluids, temperatures and rotating speeds, and belongs to the technical field of impeller machinery. The realization method of the present invention is: carry out correction on the basis of the definition of traditional cavitation number, obtain the cavitation similarity parameter after correction, select the preset value m% of head coefficient drop, and establish the corresponding value according to the condition that the cavitation similarity parameter remains unchanged when cavitation is similar The relationship between the cavitation number of different working conditions under the same discharge coefficient of the same inducer, and then the cavitation characteristic curve under known working conditions can be used to predict the cavitation characteristics under unknown working conditions. According to the existing induced wheel cavitation characteristic curves under at least two working conditions, the present invention predicts the unknown cavitation characteristic curves under other working conditions, which can reduce the number of induced wheel cavitation characteristic experiments and the cost of experiments, and further solve the induced wheel cavitation Engineering issues related to feature domains.
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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IPC IPC(8): G06F30/17G06F119/14G06F119/08
CPCG06F30/17G06F2119/06G06F2119/08
Inventor 王国玉陈晖樊亚丁梁文栋项乐
Owner BEIJING INSTITUTE OF TECHNOLOGYGY