Research On Secure Interactionof Asymmetric Multiprocessing

The thin disk laser has the advantages of geometric structure, combined with the excellent characteristics of Yb: YAG crystal material itself, which has the advantages of high output power and high beam quality. However, under the condition of high temperature, the performance of the material will also be greatly reduced. Therefore, disk lasers need efficient cooling techniques. Based on the theory of jet impingement and heat transfer, the method of simulation analysis and experimental verification is used to optimize the jet impingement cooling technology.Firstly, this thesis introduces the jet flow and heat transfer theory combined with the characteristics of laser disc impingement cooling.Then, the analytical model of the simulation calculation and the corresponding properties and boundary conditions are given. Under certain conditions of the total area of the jet orifice, the hole spacing, aperture and impingement distance were simulated and analyzed, and the optimal coordination relationship between the hole spacing, aperture and effective cooling range was found. That would be demonstrated by using the calculation results of the fluid velocity, heat transfer coefficient, the disc temperature. Through the simulation analysis under different pump pressures, the disc temperature changes with the impingement distance shows that the impact distance also has an optimum value. In addition, this thesis analysis the effect of different nozzle on impact deformation in terms of impact pressure, found that the bigger diameter of jet, impinging pressure greater, and hole spacing does not affect the size of the impact pressure.In order to verify the simulation results, according to the basic principle of heat transfer, we design experimant to measure the coefficient of heat transfer based on the principle of restoring shape of the heat source of the disk. When calculate and process the experimental data.,the fitting method is used to get the equivalent heat transfer coefficient, which is more accurate evaluation parameter of the nozzle heat transfer ability. The experimental results are consistent with the simulation analysis. The nozzle which has the best cooling effect has the hole spacing of 1.6mm, diameter of 0.6mm, the equivalent heat transfer coefficient can reach 59000W/m2 K at water flow rate of 3L/min.Finally, we design the test experiment of jet impingement cooling effect in the actual disk lasers. The result is consistent with the conclusions of simulation analysis.