Method for determining flow instability boundaries of parallel narrow channels under dynamic motion conditions
A determination method and narrow channel technology, applied in special data processing applications, instruments, electrical and digital data processing, etc., can solve problems such as inaccuracy, instability boundaries hide large thermal margins, etc., to ensure safety, Meet the needs of thermal hydraulic design and safety analysis, and achieve the effect of enveloping
Active Publication Date: 2020-08-07
NUCLEAR POWER INSTITUTE OF CHINA
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[0004] The purpose of the present invention is to provide a method for determining the instability boundary of the parallel narrow channel flow under the dynamic condition of motion, and to solve the existing problem of using a coefficient correction to obtain the corresponding boundary under the vertical static condition to determine the instability boundary under the dynamic condition of motion. A problem that caused the determined instability boundary to be inaccurate due to hiding a large thermal margin
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[0048] like figure 1 As shown, a method for determining the instability boundary of parallel narrow channel flow under dynamic conditions, including the following steps:
[0049]S1: Obtain and analyze the flow instability data of parallel narrow channels under vertical static conditions, and obtain the static calculation model of the instability boundary under vertical static conditions:
[0050] Take the inlet subcooling degree N sub and the number of inlet phase transitions N pch As a dimensionless parameter of the instability boundary, the calculation model of the instability boundary under the vertical static condition is obtained through data fitting, as follows:
[0051] N pch =K 1 N sub +K 2 (5);
[0052] S2: Obtain and analyze the instability data of the parallel narrow channel flow under the dynamic condition of motion, and obtain the motion correction parameters, which include pressure parameters, extreme points, dimensionless acceleration and dimensionless a...
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The invention discloses a method for determining flow instability boundaries of parallel narrow channels under a dynamic motion condition. The method comprises the following steps of: S1, acquiring and analyzing flow instability data of the parallel narrow channels under a vertical static condition, and acquiring a static calculation model of the instability boundaries under the vertical static condition; S2, acquiring and analyzing the flow instability data of the parallel narrow channels under the dynamic motion condition, and acquiring motion correction parameters, S3, correcting the staticcalculation model of the instability boundaries obtained in the step 1 through the motion correction parameters obtained in the step 2, and acquiring a calculation model of the flow instability boundaries of the parallel narrow channels under the dynamic motion condition. The method solves the problem that the determined instability boundaries are inaccurate due to the fact that large thermotechnical margin is hidden when a coefficient is adopted for correction to obtain the corresponding boundaries under the vertical static condition to determine the instability boundary under the motion condition dynamic condition in the prior art.
Description
technical field [0001] The invention relates to the field of thermal hydraulics, in particular to a method for determining the flow instability boundary of parallel narrow passages under dynamic conditions. Background technique [0002] In the thermohydraulic design and safety analysis of the heat exchange system, it is one of the important design limit criteria that the flow pulsation (flow instability) between the coolant channels does not occur between the channels. For the parallel narrow-channel heat exchange system where the coolant flow channel is a closed channel, the flow instability phenomenon is more likely to occur. It is even more important to consider that flow instability does not occur between coolant channels. [0003] For the parallel narrow channel heat exchange system with dynamic self-feedback characteristics, the current method of determining the boundary of flow instability mostly adopts the method of coefficient correction on the basis of obtaining t...
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IPC IPC(8): G06F30/20G06F30/28G06F111/10G06F119/08G06F119/14G06F113/08
CPCG06F30/20G06F30/28G06F2111/10G06F2113/08G06F2119/08G06F2119/14
Inventor 黄彦平王云刘文兴袁德文王艳林
Owner NUCLEAR POWER INSTITUTE OF CHINA