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Performance of Jet Pulse Assembly with a Throttle Plate in a Fluidic Oscillator

Received: 18 December 2019 Accepted: 28 March 2020 This paper aims to solve several defects of a 122mm fluidic oscillator in practical application, namely, unstable communication, high pressure drop, and low pulse amplitude. These defects were solved through mechanical analysis and field test. The results show that the downstroke piston rod can work smoothly, but the upstroke piston rod cannot due to the overcurrent resistance at the throttle plate. Through design optimization, the throttle plate can reduce the upward resistance, while increasing the pressure amplitude. Experiments indicate that the initial displacement of the new 122mm assembly was 5L/s. Under the displacement of 10–14L/s, the tool pressure drop fell between 1.5 and 3.5MPa, and the pulse amplitude reached 0.7–1.9MPa. The optimized tool clearly outperformed the original tool. The field tests demonstrate that the optimized tool could operate continuously for 155h without failure, and improve the drilling efficiency by 40.71%. The results fully verify the effectiveness of the optimized tool. The research results are conducive to the popularization of fluidic oscillator.