Optimum gap design method of diaphragm nozzle based on sound energy dissipation and diaphragm nozzle
A technology of nozzles and baffles, which is applied in the field of unstable combustion control of rocket engines, can solve the problems of lack of a complete and effective design method, harsh working environment of rocket engines, and high experimental costs, so as to reduce the development cycle and experimental workload , low-cost effect
Active Publication Date: 2020-09-11
BEIHANG UNIV
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Problems solved by technology
However, at present, there is still no complete and effective design method for the design of the optimal clearance of the diaphragm nozzle, and the final design results are obtained more by experience or repeated experiments.
The rocket engine working environment (high temperature, high pressure) is extremely harsh, the requirements for experimental methods and operators are relatively strict, and the experimental cost is relatively high
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[0033] In order to make the object, technical solution and advantages of the present invention clearer, the specific implementation method of the present invention will be further described below in conjunction with the accompanying drawings. In this embodiment, the design method of the present invention is used to design the optimal gap of the diaphragm nozzle in the liquid rocket engine, and the effectiveness of the present invention is verified by comparing the experimental results of different diaphragm nozzle gaps. The specific implementation method is described as follows:
[0034] In rocket engine diaphragm nozzles, the main sound absorption function is the slowly changing cross-section channel formed by adjacent nozzles, such as figure 2 shown. Due to the complexity of the problem, reasonable simplification of the column grid channel of the partition nozzle can be simplified into single, two, three or more channels with gradual cross-sections. In this embodiment, onl...
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The invention provides an optimal gap design method of partition board spray nozzles based on sound energy dissipation and the partition board spray nozzles. The optimal gap design method adopts a progressive approaching method, and comprises the following steps of simplifying sloped variable cross-section channels of every two adjacent spray nozzles into a plurality of equal-section channels which are mutually connected; through phase step condition, contacting sound systems of the adjacent equal-section channels, and establishing the relationship between the gaps of the partition board spraynozzles and the sound energy dissipation; and calculating the sound energy dissipation under gaps of the different the partition board spray nozzles, and when the sound energy dissipation is maximum,determining the corresponding gap of the partition board spray nozzles as the optimal gap of the partition board spray nozzles. The optimal gap design method disclosed by the invention is suitable for design of the optimal gap of the partition board spray nozzles of all kinds of rocket engines, and is convenient and swift, low in cost, and high in reliability; and the experiment workload in the design can be reduced, and the developing cycle is greatly reduced. The invention further provides the partition board spray nozzles which are designed by the above design method.
Description
technical field [0001] The invention belongs to the field of rocket engine unstable combustion control, and relates to a partition nozzle of a combustion chamber of a rocket engine, in particular to a method for designing the optimal clearance of a partition nozzle based on sound energy dissipation and the partition nozzle. Background technique [0002] During the working process of the liquid rocket engine, due to the high temperature and high pressure environment, it is easy to cause unstable combustion. Unstable combustion will cause extremely high combustion rate and heat transfer efficiency, resulting in violent oscillation, leading to ablation of the injection panel, and even explosion, affecting the normal operation of the entire power system. Among them, the most destructive high-frequency unstable combustion is formed by the coupling of the fuel combustion process and the acoustic characteristics of the combustion chamber. Therefore, the acoustic characteristics of ...
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IPC IPC(8): F02K9/52
CPCF02K9/52
Inventor 杨立军李敬轩刘旺富庆飞覃粒子
Owner BEIHANG UNIV