Analysis Of Recoil Brake Fluid And Its Effect On The Structure

The recoil brake is an important component of the artillery. its major functions include acting as a buffer against the huge recoil force produced when the gun fires, ensuring the firing stability and improving firing accuracy. Therefore, the working environment of gun recoil brake is harsh, moreover, the inner structures of which are much more complex than that of conventional fluid machinery or hydraulic equipment, and the change rule of its inner flow field is hard to be mastered. In order to research the inner workings of recoil brake well,and reduce the impact on the analyzation of the interaction between recoil brake fluid and its structure(which is caused by the simulation model simplification of recoil brake and by merely consideration of solid effect on flow field), this thesis, by means of one-way coupling simulation, primarily studies the internal environment of artillery recoil brake and investigates solid variation which is driven by fluid movement. The main contents includes:1. In this paper,a three-dimensional model is established according to the actual situation of recoil brake, throttle ring and the size of throttle bar with changing diameters are retained,and piston sleeve, along with counter recoil buffer inner structure are simplified. By applying ansys mesh, the solid structure and fluid domain of recoil brake are respectively grid partioned.2. By using dynamic grids layering and local re-meshing methods,combining the use of profile method, the recoil brake flow fields are three-dimensionally simulated. The simulation provides instantaneous distribution of the pressure and speed of recoil brake internal flow, and the recoil brake hydraulic resistance coefficient can be obtained through analysis. That is to say, the methods in the present thesis omits the experiments conducted to measure hydraulic resistance coefficient, and the selection of coefficient is also numerically optimized.3. Considering the effect of fluid movement to structure, fluent-structural one-way fluidsolid coupling with ansys is implemented, which concludes the instantaneous distribution of the equivalent strains, elastic stresses and displacement on a solid structure. Also, found that the brake control rod will produce elastic shock and the abrasion theory of recoil brake is studied. Overall, this study may offer a new kind of theoretical references for the further optimization design of artillery and for the extension of service life of recoil brake.