Research On Experiment And Applications Of Safe Cutting Of Self-vibration Pulsation Abrasive Waterjet

Acccording to experimental research, numerical simulation and theoretical analysis, and based on the generation principle and basic characteristics of self-vibration pulsation abrasive waterjet ("AWJ"), this dissertation experimentally investigates the impact features and pulsation frequency of AWJ. The impact pressure features under different pressure and range of AWJ are revealed. By using the impact pressure fluctuation law and high-speed imaging method, the pulsation frequency of AWJ is estimated and analyzed, disclosing its law. With regards to main parameters affecting the cutting performance of AWJ, a lot of experiments were conducted. The relationship between the influential parameters and cutting performance is obtained, which serves to provide parameters for the development of AWJ cutting device. Through the temperature change testing experiment in the process of AWJ cutting, the feasibility of using this cutting technique in the hazardous environment of coal mine is studied. Fluent simulation software is used to analyze the flow field inside and outside the AWJ spray nozzle, finding out the time-based law of the speed and pressure inside and outside the flow field and promoting the understanding of the AWJ flow field motion law. By analyzing domestic and overseas scholars’research on waterjet cutting physics, the cutting principle of AWJ is revealed. Based on the above-mentioned research results, a set of portable AWJ safe cutting device for coal mine is independently developed. The research results provide technical equipment to safe cutting of such hard materials as metal and rock in highly hazardous environment of coal mine, and are of important theoretical and practical significance to the safe production of coal mine.