【摘要】：基于Comsol Multipysics仿真軟件,建立了聲發(fā)射耦合的板材-污垢多層有限元模型。以彈性動力學(xué)和壓力聲學(xué)為理論基礎(chǔ),推導(dǎo)了薄平板型試樣在平面波輻射下的聲波振動控制方程,研究了流相與固相區(qū)域超聲傳播特性規(guī)律,實現(xiàn)了二維平板污垢縱、橫波分離的彈性數(shù)值模擬,通過分離后的波場提取,對薄層平板沉積污垢厚度進(jìn)行高精度檢測。數(shù)值模擬結(jié)果表明:流相區(qū)域服從微小聲波波動方程傳播規(guī)律,固相區(qū)域也能很好的實現(xiàn)彈性縱橫波的完全分離提取;超聲波對薄層平板沉積污垢的檢測誤差在5%以內(nèi),證明了數(shù)值模擬的可行性與準(zhǔn)確性,對于實際換熱系統(tǒng)的運行和清污具有很好的指導(dǎo)作用。
[Abstract]:Based on Comsol Multipysics simulation software, an acoustic emission coupled plate-fouling multi-layer finite element model is established. Based on the theory of elastic dynamics and pressure acoustics, the acoustic vibration control equations of thin plate specimens under plane wave radiation are derived. The characteristics of ultrasonic propagation in fluid and solid regions are studied, and the two-dimensional plate fouling longitudinal is realized. The elastic numerical simulation of shear wave separation is used to detect the thickness of sediment dirt on thin plate with high precision by extracting the separated wave field. The numerical simulation results show that the flow region obeys the propagation law of the micro acoustic wave equation, and the solid phase region can also realize the complete separation and extraction of elastic longitudinal and transverse waves. The detection error of ultrasonic wave on thin plate deposition is less than 5%, which proves the feasibility and accuracy of numerical simulation, and has a good guiding effect on the operation and cleaning of the actual heat transfer system.
【作者單位】： 東北電力大學(xué)自動化工程學(xué)院;
【基金】：國家自然科學(xué)基金項目(51176028)資助~~
【分類號】：O353.4;TB559
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本文編號：2436801