Device and method for detecting signals in high pressure water jet self-excitation nozzle cavity
A high-pressure water jet, oscillating signal technology, used in measurement devices, fluid dynamics tests, machine/structural component testing, etc., can solve problems such as low resolution, image dispersion, spectral energy leakage, etc., to achieve low cost, work High efficiency and easy operation effect
Inactive Publication Date: 2014-08-13
UNIV OF SCI & TECH BEIJING
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The fast Fourier transform (FFT) spectrum has serious energy leakage and low resolution, the obtained image is scattered, and it is difficult to distinguish frequency bands
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[0031] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.
[0032] The invention provides a device and method for detecting an oscillation signal in a cavity of a high-pressure water jet self-excited nozzle.
[0033] Such as figure 1 As shown, a high-pressure water jet self-excited nozzle cavity oscillation signal detection device includes a water tank 1, a filter 2, a water pump 3, a one-way valve 4, a flow meter 5, a safety cut-off valve 6, an accumulator 7, and a pressure gauge 8. Nozzle device 9, peripheral signal acquisition hole 10 of the oscillation cavity, signal acquisition hole 11 at the lower end of the collision surface of the oscillation cavity, water inlet 12 of the nozzle device, water outlet 13 of the nozzle device, multi-functional data acquisition system 14 and computer 15; 1. Filter 2, water p...
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The invention provides a device and method for detecting signals in a high pressure water jet self-excitation nozzle cavity and belongs to the field of industrial cleaning. According to the device, signal collection holes are formed in the periphery of the nozzle device oscillation cavity and in the lower end of a collision face of the oscillation cavity, one end of a sensor is connected with the signal collection holes, the other end of the sensor is connected with the front data collection end of a multifunctional data collection system, information picked up by the sensor is processed and analyzed through the data collection system, data are sent into a computer to be analyzed and processed, and an HHT time-frequency brightness spectrogram and an HHT marginal spectrogram are acquired. Through comprehensive analysis and comparison, sources of all frequency components in signals are judged, and the oscillation frequency components are extracted. An effective means is provided for further analyzing influences of different structural parameters, incoming flow parameters and the like on self-excitation oscillation, researching the self-excitation oscillation jet mechanism and acquiring the best self-excitation oscillation jet effect. The device is convenient to operate and visual in response and provides a testing means for factory inspection of nozzle device products in the future.
Description
technical field [0001] The invention relates to the field of industrial cleaning, in particular to a device and method for detecting oscillation signals in a cavity of a high-pressure water jet self-excited nozzle. Background technique [0002] Water jet is water as the medium, after obtaining huge energy through the high-pressure generating device, it uses a specific fluid movement mode to eject a stream of water with high speed and high energy concentration from a nozzle of a certain shape. The self-excited oscillating jet is a new type of high-efficiency pulsed jet developed using the principles of fluid mechanics, fluid resonance, fluid elasticity and hydroacoustics. It is a typical unsteady multiphase flow. Oscillations are generated in the jet, turning the continuous jet into an oscillating pulse jet. It has the characteristics of pulse jet and cavitation jet. Traditional water jet experiments are mainly based on crushing experiments and cavitation noise analysis. T...
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IPC IPC(8): G01M10/00G01D21/02
Inventor 马飞马琳汪晖柳靖赵静
Owner UNIV OF SCI & TECH BEIJING