Optimization method of oil leakage characteristics of aircraft fuel tank based on smooth particle hydrodynamics

Abstract

The invention provides an airplane fuel-tank swap oil characteristic optimization method based on smoothed particle hydrodynamics. According to the method, the position and size of a swap oil hole of a fuel-tank baffle are changed, so that the purposes of inhibiting fuel fluctuation and improving the swap oil property are realized. According to the method, fuel-tank baffles with small liquid filling ratio, middle liquid filling ratio and large liquid filling ratio are designed, the design result of the previous generation is preserved during a design process, and finally, adaptive processing is performed, so that final layout of swap oil holes is obtained. By use of the smoothed particle hydrodynamics knowledge, fluid flowing is simulated, so that fracture behavior of a free fluid surface can be better simulated, furthermore the computation amount is reduced, and possibility for realizing iteration optimization is created.

Description

technical field [0001] The invention belongs to the field of layout design of oil stringing holes in a partition in an aircraft fuel tank, and in particular relates to an optimization method for the oil stringing characteristics of an aircraft fuel tank based on fluid dynamics of smooth particles. [0002] technical background [0003] In order to improve aircraft endurance without damaging the aerodynamic structure, designers often choose to use parts with complex structures and poor space availability as fuel storage areas, the most typical of which is the wing fuel tank layout; During the flight, to suppress the movement of the oil body, facilitate the measurement of the oil quantity, and improve the structural strength, a number of partitions are generally installed in the fuel tank; at the same time, in order to reduce the quality of the aircraft and facilitate manual maintenance, the center of mass of the oil body will return to the equilibrium state as soon as possible ...

AI Technical Summary

Problems solved by technology

[0003] In order to improve aircraft endurance without damaging the aerodynamic structure, designers often choose to use parts with complex structures and poor space availability as fuel storage areas, the most typical of which is the wing fuel tank layout; During the flight, to suppress the movement of the oil body, facilitate the measurement of the oil quantity, and improve the structural strength, a number of partitions are generally installed in the fuel tank; at the same time, in order to reduce the quality of the aircraft and facilitate manual maintenance, the center of mass of the oil body will return to the equilibrium state as soon as possible after the large overload movement. The oil tank partition needs to be opened to ensure the communication between the various compartments; the oil flow problem is usually not considered in the traditional design scheme, the oil flow hole is very large, and the oil flow performance is excessively redundant, which not only reduces the suppression of oil body fluctuations, For large aircraft, which often consume dozens of tons of fuel, it means that the flight stability is seriously reduced, and at the same time, the strength of the load-bearing structure is reduced, resulting in an increase in the mass of the aircraft

For the problem of fuel flow in the fuel tank, there are few reports on the work of international colleagues. Commonly used fluid simulation methods have weak simulation capabilities for free liquid surface fluctuations and breakage, and consume a lot of computing power. They are not suitable for severe flow problems that may exist in aircraft fuel tanks. Sex is not ideal

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