| The research work in this paper is advanced research work of the National Natural Science Foundation:"micro-excited oscillation jet concentration dissipation gas wave refrigeration mechanism and strengthening"(51276026). In order to meet the experimental test requirements of oscillation jet gas wave tube high-speed dynamic flow field parameters, analysis work and in-depth research were made for the special fluid machinery based on the moving pressure wave.Moreover, accurate measurement of the parameters of the dynamic flow field oscillating jet were further cleared and demonstrated.And more in-depth study and exploration of such new gas wave devices, especially stationary maintenance-free high-efficiency gas-wave equipment, were conducted,which is a must and one of the prerequisites of high-speed flow control, gas wave function and applied theory.Through the research of the current computer data acquisition technology and a reference for similar areas such as vibration measurement and analysis means, and a detailed analysis of the experimental research and testing background-the oscillating jet generator and common cavity gas wave tube characteristics and requirements, the design of a high-speed multi-channel synchronous data acquisition system solutions was proposed, each channel signal using the short-period high-speed synchronous sampling, at the same time A/D conversion and high-speed cache, sequentially output the way. It is possible to capture in real time changes in the dynamic parameters of the high-speed flow field for high-speed changes in the measurement data to reveal the flow characteristics of its laws.In order to achieve synchronization phase of the cycle signal acquisition, as the core of the implementation of high-speed computer data acquisition system with external trigger function, the PCI8510data acquisition card, in this study research on excitation signal source as a trigger source, delay phase can be continuously adjust the single-chip microcomputer control delay trigger scheme. We also make a corresponding analysis and put forward solutions for sensor, temperature drift and signal amplification and processing, anti-interference, and other practical problems.Measurement and data processing software using visual c++6.0programming, implementing the functions of real-time collection, real-time data curve display, data storage and data transfer, and with a variety of trigger can be used to achieve multi-way synchronization data sampling. This system can meet the requirements of the multi-point, high-speed, instantaneous demand synchronous sampling for dynamic flow field parameters of gas wave tube.Test parameters of this paper were made by the time synchronization process. The images reveal transient flow field parameters and play an important role for the study of the high-speed flow field.In order to verify and affirm fully functional practicality and reliability of the test system,this paper make the simulation measurement sensor and use reference signal source-ATF20B type dual DDS signal generator signal as a high-speed dynamic simulation of flow field parameters measurement sensor signal, respectively,using sine wave, triangle wave, square wave signal to the test system. The maximum input signal frequency limit is15kHz, and testing system can accurately restore the change of the input signal, By that analogy, the gas flow parameters are able to follow the highest frequency of15kHz, which can meet the requirements of most of the experimental research. Synchronous trigger function ensures that every branch sampling phase synchronization, and provides a convenient and effective method and way for analysis of transient parameters of the flow field distribution and the corresponding precise time node. |
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