液氧离心泵水力设计方法的研究

发布时间：2018-12-18 03:47

【摘要】：液氧泵的研制任务就是设计一台高效率的液氧离心泵。以该泵为核心设备的地面液氧加注系统，能够将液氧从地面高品质地泵送至长征系列运载火箭上的液氧贮箱。本文研究了一种在国内航天地面加注系统从未有过的，与全流道全三维流场的水力数值计算方法相结合的，“反－正－反”迭代耦合的新型水力设计方法，来设计确定液氧泵的水力参数。通过本文研究的新型水力设计方法研制出来的液氧离心泵，经发射场试验证明，其水力性能不仅完全满足地面液氧加注系统的要求，并且泵效率较高。这种迭代耦合新型水力设计方法的具体研究内容为：先采用“反问题”设计，根据该液氧泵研制任务的参数特点——低比速离心泵，选择适合于该具体工况低比速液氧离心泵的一维水力方法。再进行“正问题”计算，，本文采用的是全流道全三维流场的CFD数值计算方法，通过正确选择适合该类泵的计算模型和正确设置各项参数，该全流道全三维流场的数值计算收敛，并提供了一种直观形象的流场形态，数值计算结果反应了泵内水力的真实情况、揭示出泵内液流运动的规律、并能在计算机设计阶段分析发现泵水力设计的问题和不足。“正问题”计算发现问题后，再通过“反问题”修改设计，“正问题”再次计算及分析。就这样多次迭代耦合地反复修改水力设计，直至最终计算结果显示，流场已最优化。通过这种新型水力设计方法的研究效果证实，该方法可以在设计阶段即实现对泵性能的评价，从而设计出最优化的离心泵，并大幅缩短研制周期和费用。研究出的这种实用有效的新型水力设计方法，将对提高今后的国内航天加注等用泵的研制水平起到极大地推动作用。
[Abstract]:The research and development of liquid oxygen pump is to design a high efficiency liquid oxygen centrifugal pump. The surface liquid oxygen filling system with the pump as the core equipment can pump the liquid oxygen from the ground high quality to the liquid oxygen tank on the long March series carrier rocket. In this paper, a new hydraulic design method, which has never existed in the domestic space ground filling system, and which is combined with the hydraulic numerical calculation method of the full-channel three-dimensional flow field, is studied in this paper, which is coupled with the "anti-positive-inverse" iterative method. To design and determine the hydraulic parameters of the liquid oxygen pump. The liquid-oxygen centrifugal pump developed by the new hydraulic design method studied in this paper has been proved by the field test that its hydraulic performance not only fully meets the requirements of the surface liquid-oxygen filling system, but also has a high pump efficiency. The specific research contents of this iterative coupling new hydraulic design method are as follows: first, the "inverse problem" design is adopted, and according to the parameter characteristics of the research and development task of the liquid oxygen pump-low specific velocity centrifugal pump, A one-dimensional hydraulic method suitable for low specific speed liquid oxygen centrifugal pump was selected. Then the "positive problem" calculation is carried out. In this paper, the CFD numerical calculation method of the full three-dimensional flow field of the whole passage is adopted. The numerical calculation convergence of the full-channel three-dimensional flow field is obtained by selecting the calculation model and setting the parameters correctly for this kind of pump. The numerical results reflect the real situation of the hydraulic power in the pump, reveal the law of the fluid flow movement in the pump, and can be analyzed in the stage of computer design to find the problems and shortcomings of the hydraulic design of the pump. After the problem is discovered by "positive problem" calculation, the design is modified by "inverse problem", and the "positive problem" is calculated and analyzed again. In this way, the hydraulic design is modified repeatedly and iteratively until the final calculation results show that the flow field has been optimized. Through the research results of this new hydraulic design method, it is proved that this method can realize the evaluation of pump performance in the design stage, thus the optimum centrifugal pump can be designed, and the development cycle and cost can be greatly shortened. This practical and effective new hydraulic design method will play a great role in improving the development level of domestic spaceflight filling pump in the future.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH311

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